★ SOSA Vaayu · how much oil it uses
A cold-air diffuser does not have a fixed consumption rate — it has a dial, and 400ml over 90 days is one point on it rather than a promise
★ ★ ★ ★ ★
★★★★★
"I had been running it at full intensity in a room that needed half of that. Dropping the dial two steps changed nothing about the room and everything about the tank."
Villa · 1,800 sq ft
★★★★★
"Four bottles of a hundred millilitres each. Working out that each one is about three weeks at mid setting made the whole thing planable."
Two-bedroom villa let
★★★★★
"Nobody else explains that a bigger room does not use more oil by itself — the setting you choose for it does. That distinction saved me money."
Open-plan ground floor
★★★★★
"Straight about there being no refill on sale yet. I planned the 400ml as a fixed budget from day one instead of assuming more was coming."
Vaayu ₹11,999
★★★★★
"The timer is the real consumption control. Eight hours on a schedule instead of all day and the tank stopped disappearing."
Boutique guesthouse
★★★★★
"Useful that it says the spec does not state how many hours a day the ninety-day figure assumes. Everyone else pretends that is settled."
Villa owner · Alibaug
★★★★★
"I had been running it at full intensity in a room that needed half of that. Dropping the dial two steps changed nothing about the room and everything about the tank."
Villa · 1,800 sq ft
★★★★★
"Four bottles of a hundred millilitres each. Working out that each one is about three weeks at mid setting made the whole thing planable."
Two-bedroom villa let
★★★★★
"Nobody else explains that a bigger room does not use more oil by itself — the setting you choose for it does. That distinction saved me money."
Open-plan ground floor
★★★★★
"Straight about there being no refill on sale yet. I planned the 400ml as a fixed budget from day one instead of assuming more was coming."
Vaayu ₹11,999
★★★★★
"The timer is the real consumption control. Eight hours on a schedule instead of all day and the tank stopped disappearing."
Boutique guesthouse
★★★★★
"Useful that it says the spec does not state how many hours a day the ninety-day figure assumes. Everyone else pretends that is settled."
Villa owner · Alibaug
✓ Vaayu · 400ml tank · 90+ days a fill at mid intensity · adjustable mist intensity ✓ 1h / 4h / 8h / 24h timers · auto-stop · key-lock · under 38 dB · 5W ✓ No separate Vaayu refill oil is sold today — confirm with SOSA before you buy
Founder Diaries · Large-Space Scenting · Oil Consumption
Why the per-hour figure is slippery: the specification does not state how many hours a day it assumes. At 24 hrs/day, 4.4 ml a day is about 0.19 ml an hour; at 8 hrs/day it is about 0.56 ml an hour. Same tank, three times the rate.
Six things move consumption: intensity setting, daily run hours, room volume, air exchange, mounting position and how disciplined you are with the timer. You control five of them.
The supply position: no separate Vaayu refill oil is sold at present. Treat the 400ml as a fixed budget and confirm availability with SOSA before spending ₹11,999.
Vaayu₹11,999 · 400ml in the boxThe Vaayu arrives with four separate 100ml bottles rather than one 400ml container, and that is a planning convenience rather than an accident. 100 ÷ 4.44 = 22.5 days — call it three weeks each at mid intensity. So the box contains four three-week runs, and you get to decide whether they are four consecutive runs of one scent each, or a single scent held for the whole quarter with the other three kept sealed, or something seasonal. Which combo you get — The Luxury Hotel Collection, Fresh & Relaxing or Signature Luxury — is chosen at checkout and the price is the same. Sequencing them is a real decision and Part three is about how to make it.
Vaayu · a dial you control₹11,999Shop → 
Sukoon · a fragrance you can rebuy₹1,899Shop → 
Evening Calm · nothing to setfrom ₹799Shop →
SOSA Vaayu specifications (verified from the live product page, August 2026): ₹11,999 (the product page displays a rounded ₹12,000). Waterless cold-air nebulisation — pressurised air atomises undiluted fragrance oil into a dry nano-mist; no water, no heat, residue-free. Coverage up to 1000m³, about 2,000–3,000 sq ft. 400ml refillable tank, 90+ days per fill at a mid intensity setting. Bluetooth app plus onboard buttons, 1h / 4h / 8h / 24h timers, adjustable mist intensity, auto-stop and key-lock. Under 38 dB. DC 12V / 1A, 5W. 165 × 80.5 × 215 mm, 0.9 kg, black or white. Freestanding or wall / HVAC mount. CE, RoHS and SGS certified. Ships with four SOSA Hotel Collection fragrances at 100ml each (400ml in total) in one of three combos chosen at checkout. SOSA does not currently sell a separate Vaayu refill oil; the 400ml supplied in the box is the fragrance available at the time of writing, and buyers who need long-term supply should confirm current refill availability with SOSA before purchasing. The cold-air oil supplied with the Vaayu is a different product from the water-based Hotel Collection sold for ultrasonic machines (15ml ₹299 · 100ml ₹999 · 300ml ₹1,799), which must not be used in a Vaayu despite sharing scent names. Other SOSA machines: Boond 300ml ₹899 (~150 sq ft) · Sukoon 500ml ₹1,899 (270–320 sq ft) · Megh 6L ₹3,499 (~215 sq ft — a runtime and humidity machine, not a coverage upgrade) · Aangan ₹25,999 (~8,000–10,000 sq ft) · Meenar ₹38,500 (12,000–18,000 sq ft) · Safar car diffuser ₹3,999. Reed diffusers 50ml ₹749–₹849 (6–8 weeks) · 130ml ₹1,249–₹1,349 (14–18 weeks) · duo sets ₹1,498–₹1,598 · oil-only refills 300ml ₹2,399 / 500ml ₹3,499. Runtime, consumption and coverage figures are manufacturer specifications and vary with intensity setting, run hours, ceiling height, ventilation and season; any per-month or per-day figure in this guide is arithmetic on those specifications, not a measurement. Electricity costs vary by state tariff. No claim is made that scenting affects ratings, reviews, bookings, occupancy, revenue, health, mood or air quality. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.
People ask this question expecting a specification, the way a car has a fuel figure. A cold-air diffuser does not work like that. It has a dial, and consumption is whatever you set it to. The SOSA Vaayu holds 400ml and is rated at 90+ days per fill at a mid intensity setting — which is one point on a range, not a promise about your house. Before we go any further, the thing you most need to know: SOSA does not currently sell a separate Vaayu refill oil. The 400ml in the box — four Hotel Collection cold-air fragrances at 100ml each — is the whole supply available today. That makes managing consumption a genuinely useful skill rather than a hobby, and it makes checking refill availability with SOSA before you buy a sensible condition of purchase.
Quick answers — read this first
The reference point: 400ml ÷ 90 days = about 4.4 ml a day at the mid intensity setting the specification assumes. Each 100ml bottle in the box is therefore roughly three weeks of mid-setting running.Why the per-hour figure is slippery: the specification does not state how many hours a day it assumes. At 24 hrs/day, 4.4 ml a day is about 0.19 ml an hour; at 8 hrs/day it is about 0.56 ml an hour. Same tank, three times the rate.
Six things move consumption: intensity setting, daily run hours, room volume, air exchange, mounting position and how disciplined you are with the timer. You control five of them.
The supply position: no separate Vaayu refill oil is sold at present. Treat the 400ml as a fixed budget and confirm availability with SOSA before spending ₹11,999.
The short answer
Short answer: at the mid intensity setting the specification is written for, a SOSA Vaayu uses roughly 4.4 ml of oil a day — 400ml divided by 90 days. Turn the intensity up and it uses more; run it four hours a day on a timer instead of round the clock and it uses far less. There is no single consumption number for a machine with an adjustable output, and anyone who quotes you one has picked a setting on your behalf without telling you.
The mechanism: cold-air nebulisation pushes pressurised air across a nozzle to atomise undiluted oil into a dry nano-mist. The intensity control changes how much oil is atomised per pulse and how often the pump fires; the timer changes how many hours a day it fires at all. Because there is no water diluting the payload, every millilitre that leaves the tank is fragrance — which is why the reach is large and why the tank is a real budget.
Shop: Vaayu ₹11,999 — up to 1000m³, 400ml tank, adjustable mist intensity, 1h / 4h / 8h / 24h timers, auto-stop, key-lock, under 38 dB, 5W. For one normal room, Sukoon ₹1,899 · for a bedroom, a reed diffuser from ₹799 with nothing to set at all. Free shipping above ₹499.
In this guide
400ml · 90+ days a fill
Vaayu cold-air · ₹11,999
Fragrance you can rebuy
Sukoon 500ml · ₹1,899
Nothing to set
Reed diffusers · from ₹749
Straight answer
How much fragrance oil does a cold-air diffuser actually use?
1. Start from the only verified pair of numbers. The Vaayu's tank is 400ml and the specification is 90+ days per fill at a mid intensity setting. 400 ÷ 90 = 4.44 ml a day. That is the reference point, and everything else on this page is a departure from it in one direction or the other.
2. Convert it into something you can hold in your head. 4.4 ml a day is about 133ml a month, so each 100ml bottle in the box is roughly three weeks of mid-setting running and the four of them together are the quarter the specification describes.
3. Be careful with per-hour figures. The specification does not state the daily run hours behind the 90-day number. If it assumes continuous running, 4.4 ml a day is about 0.19 ml an hour. If it assumes an eight-hour day, the same daily figure is about 0.56 ml an hour. Both readings are defensible; they differ by a factor of three. Ask SOSA which is intended if the distinction matters to your planning.
4. Intensity is the biggest lever you hold. Raising the mist intensity increases the oil atomised per cycle. Nobody publishes a per-step figure and I am not going to invent one, but the direction is certain and the effect is large — a machine run hard in a big volume will not give ninety days.
5. Run hours are the second lever, and the timer enforces them. 1h / 4h / 8h / 24h timers plus auto-stop mean the machine consumes only while it is actually running. Halving the hours roughly halves the oil, and in most homes the fragrance persists well beyond the run window anyway.
6. Room volume changes consumption only through the setting you choose for it. A big room does not make the pump work harder by itself; it makes you turn the dial up, and the dial is what spends the oil. This distinction matters, because it means a large space run gently is perfectly viable if a gentle result is what you want.
7. Treat the 400ml as a fixed budget. SOSA does not currently sell a separate Vaayu refill oil, so what is in the box is what you have. Please confirm current refill availability with SOSA before you buy if long-term supply matters to you — that is the single most important sentence on this page.
Made in India, CE / RoHS / SGS certified, and a portion of every order supports girl-child education through Nanhi Kali.
2. Convert it into something you can hold in your head. 4.4 ml a day is about 133ml a month, so each 100ml bottle in the box is roughly three weeks of mid-setting running and the four of them together are the quarter the specification describes.
3. Be careful with per-hour figures. The specification does not state the daily run hours behind the 90-day number. If it assumes continuous running, 4.4 ml a day is about 0.19 ml an hour. If it assumes an eight-hour day, the same daily figure is about 0.56 ml an hour. Both readings are defensible; they differ by a factor of three. Ask SOSA which is intended if the distinction matters to your planning.
4. Intensity is the biggest lever you hold. Raising the mist intensity increases the oil atomised per cycle. Nobody publishes a per-step figure and I am not going to invent one, but the direction is certain and the effect is large — a machine run hard in a big volume will not give ninety days.
5. Run hours are the second lever, and the timer enforces them. 1h / 4h / 8h / 24h timers plus auto-stop mean the machine consumes only while it is actually running. Halving the hours roughly halves the oil, and in most homes the fragrance persists well beyond the run window anyway.
6. Room volume changes consumption only through the setting you choose for it. A big room does not make the pump work harder by itself; it makes you turn the dial up, and the dial is what spends the oil. This distinction matters, because it means a large space run gently is perfectly viable if a gentle result is what you want.
7. Treat the 400ml as a fixed budget. SOSA does not currently sell a separate Vaayu refill oil, so what is in the box is what you have. Please confirm current refill availability with SOSA before you buy if long-term supply matters to you — that is the single most important sentence on this page.
Made in India, CE / RoHS / SGS certified, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: about 4.4 ml a day at mid intensity — 400ml over 90 days — which makes each 100ml bottle roughly three weeks. Intensity and run hours move that figure a long way in both directions. And because no separate Vaayu refill oil is currently sold, plan the 400ml as your whole budget and ask SOSA about supply before you buy.
A dial, not a fixed rate
SOSA Vaayu · waterless cold-air nebuliser ₹11,999
Pressurised air atomises undiluted oil into a dry nano-mist — no water, no heat, no residue. The two controls that decide consumption are adjustable mist intensity and the 1h / 4h / 8h / 24h timers, both available from the Bluetooth app or the onboard buttons, with auto-stop and a key-lock so nobody else can change them. 400ml refillable tank rated at 90+ days a fill at mid intensity, covering up to 1000m³. Under 38 dB, DC 12V / 1A at 5W, 0.9 kg, black or white, freestanding or wall / HVAC mounted. Four Hotel Collection cold-air fragrances at 100ml each in the box; no separate refill oil is currently sold.
Part one — turning one specification into a rate you can plan with
Two verified numbers exist and everything else has to be derived from them: a 400ml tank and 90+ days per fill at a mid intensity setting. The useful move is to convert that pair into three different units, because each answers a different practical question. Per day tells you how fast the level falls. Per bottle tells you how to sequence the four scents in the box. Per hour tells you what a timer change is worth. All three are plain division, and all three carry the same caveat — they are arithmetic on a manufacturer specification, not a measurement taken in your home.
1
UNIT ONE · PER DAY
4.4 ml a day, and what that looks like in the tank
400 ÷ 90 = 4.44, so a shade under four and a half millilitres a day at the specified mid setting. Over a thirty-day month that is roughly 133ml, which is a third of the tank. If you like round numbers: at mid intensity a full Vaayu drops about a tenth of its tank every nine days. That is a slow enough fall that most owners never think about it until the machine reminds them, which is exactly why I want you to have the figure before you buy rather than after. It also means the level itself is a poor early-warning system — you will not notice a change of habit costing you oil until several weeks of it have gone.
The check: if your tank is falling markedly faster than a third a month, your intensity setting is higher than the specification assumes.
2
UNIT TWO · PER BOTTLE
Each 100ml is about three weeks
Vaayu₹11,999 · 400ml in the boxThe Vaayu arrives with four separate 100ml bottles rather than one 400ml container, and that is a planning convenience rather than an accident. 100 ÷ 4.44 = 22.5 days — call it three weeks each at mid intensity. So the box contains four three-week runs, and you get to decide whether they are four consecutive runs of one scent each, or a single scent held for the whole quarter with the other three kept sealed, or something seasonal. Which combo you get — The Luxury Hotel Collection, Fresh & Relaxing or Signature Luxury — is chosen at checkout and the price is the same. Sequencing them is a real decision and Part three is about how to make it.
The consequence: a signature scent held across a whole quarter costs you three unopened bottles' worth of variety. That is a legitimate trade either way.
3
UNIT THREE · PER HOUR
The figure that depends on an assumption nobody states
This is where most published consumption figures quietly cheat. To get millilitres per hour from millilitres per day you must know the daily run hours, and the Vaayu specification does not say how many hours a day the 90-day figure assumes. Two honest readings exist. If it assumes the machine runs continuously, 4.44 ml a day is 4.44 ÷ 24 = 0.185 ml an hour. If it assumes a typical intermittent pattern of eight hours a day, the same daily figure becomes 4.44 ÷ 8 = 0.555 ml an hour — three times as much per hour of actual running. I am not going to pick one and present it as fact. What I will say is that the conservative planning assumption is the continuous reading, because it produces the shorter tank life when you then apply it to a heavier schedule, and planning short is the right way round for a supply you cannot currently top up.
Part two — the six things that move consumption, and who controls each
Direction is certain for all six; magnitude is not published for any of them, so the third column describes the size of the effect in words rather than pretending to a number I do not have. Read the last column first — it tells you which of these are actually yours to change.
What actually spends the tank
Six variables, ranked by how much difference they make
| Variable | Which way it pushes | How big the effect is | Where it bites | Who controls it |
|---|---|---|---|---|
| Mist intensity setting ★ | Higher intensity, more oil per cycle | The largest single lever on the machine | Immediately, from the first hour | You — app or onboard buttons |
| Daily run hours | Fewer hours, proportionally less oil | Close to linear — half the hours, roughly half the oil | Over weeks, invisibly | You — 1h / 4h / 8h / 24h timers |
| Connected volume | Bigger volume pushes you toward a higher setting | Indirect but decisive — it changes the dial, not the pump | At the point of setup | Your architecture, then your dial |
| Air exchange and AC behaviour | More fresh-air turnover dilutes faster | Moderate — it makes a given setting feel weaker | Seasonally, and when windows open | Partly you — doors, windows, fan speed |
| Mounting position and height | Poor placement wastes output on one corner | Moderate — better placement lets you set lower | Once, at installation | You — freestanding or wall / HVAC mount |
| Guest and household tampering | Someone turns it up and forgets | Small per incident, large over a quarter | In let properties, constantly | You — the key-lock exists for this |
| The honest caveat: SOSA publishes a tank size, a days-per-fill figure and the existence of an adjustable intensity control. It does not publish a millilitres-per-hour rate for each intensity step, and neither does this page — every magnitude above is a direction and a rough weighting from how these machines behave, not a measured value. If you need precise consumption for a commercial plan, measure your own: mark the tank level, run your intended schedule for two weeks, and divide. That two-week measurement will beat any figure anyone can give you, including mine. And note the constraint that frames all of it — SOSA does not currently sell a separate Vaayu refill oil, so the 400ml in the box is today's entire supply. Confirm availability with SOSA before you buy if that matters to you. | ||||
Shop this guide
Three ways to scent, three consumption stories
Vaayu · a dial you control₹11,999Shop → Sukoon · a fragrance you can rebuy₹1,899Shop → Evening Calm · nothing to setfrom ₹799Shop →
The SOSA principle
A big room does not drink more oil. The setting you chose for the big room does.
Volume, ceiling height and air exchange all matter — but they reach your tank only through the dial. Which means consumption is a decision you make, and can unmake, at any point.
Part three — spending a fixed 400ml deliberately
Here is the part that makes this page different from every other consumption guide, and it follows directly from the supply position. SOSA does not currently sell a separate refill oil for the Vaayu. The four 100ml bottles that arrive with the machine are, at the time of writing, the entire cold-air fragrance supply available to a Vaayu owner. I am not going to soften that, and I am certainly not going to point you at the water-based Hotel Collection at ₹299, ₹999 and ₹1,799 as a substitute — that is a different product formulated for ultrasonic machines, it shares scent names with the cold-air oils purely because the scents are the same compositions, and it must not go into a Vaayu. Reed diffuser oil goes in neither. If a continuous supply is part of what you are buying, ask SOSA where refill availability stands on the day you order, and treat the answer as a condition rather than a detail.
Once you have accepted that framing, consumption management stops being penny-pinching and becomes ordinary planning. The instinct most new owners have is exactly wrong: they open the box, set intensity high because they want to be impressed, and burn a fifth of their supply proving to themselves that the machine works. The better sequence is the opposite. Fill with one bottle, set the intensity to its lowest usable step, run an eight-hour timer covering the hours you are actually in the space, and live with it for a week. If the room is right, you have found your setting and your 400ml will go a very long way. If it is not, raise the intensity one step and wait another few days before touching it again — fragrance takes time to establish in a large volume, and the commonest cause of over-setting is impatience rather than a genuinely weak machine.
One more consideration that belongs on a consumption page. Oil in a sealed bottle and oil in an open tank are not in the same condition. Keep the unopened 100ml bottles capped, upright, out of direct sunlight and away from heat — the same discipline we ask of reed diffuser oil, and for the same reason, which is that light and heat are what age a composition. If you are going to be away for a month, it is better to leave the tank as it is with the machine switched off than to try to decant it back. And the usual boundary, stated once more because running-cost pages are where it tends to slip: a scent machine adds fragrance and does nothing else. It does not clean, purify or deodorise the air, and it makes no difference to anybody's health, sleep or mood. Ventilate first; scent second.
Most people's first fifty millilitres go on convincing themselves the machine works. Set it low and wait a week instead.
— Sonal Sahani, SOSA
Part four — a consumption plan, by what you are trying to achieve
Four honest objectives, each with the setting and schedule I would actually use, and what the 400ml then works out to. The day figures are arithmetic on the 4.44 ml a day reference and the stated relationship between run hours and consumption — they are planning estimates, not guarantees.
The consumption plan
Pick your objective, then set the machine to match
| What you are trying to do | Intensity | Timer | What 400ml works out to |
|---|---|---|---|
| Make a large open floor pleasant while you are in it ★ | Lowest usable step, raised only after a week | 8h, covering evening and night | Comfortably beyond the 90-day figure |
| Hold one signature scent across a whole quarter | Mid — the setting the specification assumes | 8h or 24h, unchanged all quarter | Roughly 90 days on all four bottles of one scent |
| Prepare a property for an arrival | Mid, dropped to low once established | 4h before check-in, then 1h top-ups | Very little — this is the cheapest use of the machine |
| Fill a volume near the top of the 1000m³ rating | High — because the volume demands it | 8h or more | Meaningfully less than 90 days. Plan for it |
| Rotate all four scents through the quarter | Mid | 8h | About three weeks per 100ml bottle |
| Scent a closed bedroom as well | Not the machine's job — a shut door is a wall | None | A reed diffuser from ₹749, 6–8 weeks, no electricity |
| Never a consumption strategy: the Megh | 6L and ~100 hrs of runtime, but only ~215 sq ft | A runtime and humidity machine | ₹3,499 — never a coverage upgrade over the Sukoon |
Honest notes for buyers: the 400ml tank, the 90+ days per fill and the adjustable intensity control are manufacturer specifications; the 4.44 ml a day, 133ml a month, 22.5 days per 100ml bottle and per-hour figures on this page are arithmetic on those specifications, not measurements, and real consumption varies with intensity, run hours, connected volume, ceiling height, ventilation and season. SOSA does not publish a millilitres-per-hour rate for each intensity step and this page does not invent one. SOSA does not currently sell a separate Vaayu refill oil — the 400ml supplied in the box is the cold-air fragrance available at the time of writing, and buyers who need long-term supply should confirm current availability with SOSA before purchasing. The water-based Hotel Collection for ultrasonic machines is a different product and must not be used in a Vaayu. Warranty, AMC, installation service, spare parts and app platform details are unverified — ask SOSA. No health, mood, air-purification or odour-removal claim is made or implied. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
When the consumption question is really a size question
SOSA Boond · 300ml ultrasonic ₹899
A fair number of people asking how much oil a cold-air machine uses are really asking whether they can afford to scent a space at all. If your space is one modest room — a study, a small bedroom, a shop counter — the answer is that you do not need a cold-air machine's consumption to think about. The Boond covers around 150 sq ft from a 300ml tank, runs about six hours a fill on USB, has a colour night light, and takes the water-based Hotel Collection whose prices are published and which you can buy again whenever you like.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
The question in this title is the one I get asked most often about the Vaayu, and for a long time I answered it badly — I would quote the ninety days and move on, because that is what the specification says and it is true. What I had not noticed is that people were hearing a promise where the specification intends a reference point. They would set the machine at full intensity in a double-height villa, watch the tank fall visibly in six weeks, and write to me convinced something was wrong with it. Nothing was wrong with it. They had turned the dial up and the dial is what spends oil.
So this page starts from the dial rather than from the number. If you understand that consumption is something you set, the ninety-day figure becomes useful instead of misleading, and you can decide for yourself whether you want a gentle field of scent that lasts five months or a firm one that lasts two. Both are correct uses of the machine.
And I will keep saying the other thing until it stops being true. We ship 400ml and we do not currently sell a separate cold-air refill. Please ask us where that stands on the day you buy. If the answer does not suit you, buy something else with a clear conscience — there is a Sukoon at ₹1,899 whose fragrance is on the shelf at a published price. Everything we make is composed in Pune, and a part of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
How many ml a day does a cold-air diffuser use?
On the SOSA Vaayu's specification — a 400ml tank rated at 90+ days per fill at mid intensity — the arithmetic gives about 4.4 ml a day, or roughly 133ml a month. Raise the intensity and it rises; run four hours a day on a timer rather than continuously and it falls sharply. It is a setting rather than a fixed rate, and no single number describes every installation.
How long does each 100ml bottle in the box last?
About three weeks at mid intensity — 100 ÷ 4.44 is 22.5 days. The Vaayu ships with four such bottles, 400ml in total, in one of three combos chosen at checkout. You can run one scent for the whole quarter or rotate all four; the total quantity is the same either way, and note that SOSA does not currently sell a separate refill oil, so this is the supply you have.
Does a bigger room make it use more oil?
Only through you. The pump does not sense the room; it does what the intensity setting tells it. A larger connected volume makes you choose a higher setting to get the same perceived strength, and that setting is what spends the tank. A large space run at a low setting will produce a gentle result and last a long time — which is a perfectly legitimate way to own the machine.
Can I measure my own consumption?
Yes, and it will beat any published figure. Note the tank level, run exactly the schedule and intensity you intend to live with for two weeks without changing anything, then note the level again and divide by fourteen. That gives you a millilitres-per-day figure for your house, your ceiling height and your ventilation, which is the only figure that genuinely applies to you.
What happens when the 400ml runs out?
This is the honest gap in the product and I would rather you knew now. SOSA does not currently sell a separate cold-air refill oil for the Vaayu, so at the time of writing the 400ml in the box is the supply available. The water-based Hotel Collection for ultrasonic machines is not a substitute and must not be used in a Vaayu. Ask SOSA where refill availability stands before you purchase.
Large-space scenting · oil consumption
Roughly 4.4 ml a day at mid intensity — but the dial is yours
The SOSA Vaayu at ₹11,999 nebulises undiluted oil into a dry cold-air mist across up to 1000m³, from a 400ml tank rated at 90+ days a fill at mid intensity, with adjustable intensity, 1h / 4h / 8h / 24h timers, auto-stop and key-lock, under 38 dB on 5W. It ships with four Hotel Collection cold-air fragrances at 100ml each — roughly three weeks apiece at the mid setting. No separate Vaayu refill oil is sold at the time of writing; confirm availability with SOSA before you commit. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
See the Vaayu → Reed diffusers from ₹749
Continue the read
More on consumption and running cost
- How much does it cost to run a cold-air scent diffuser? — electricity computed, fragrance stated honestly.
- How long does fragrance oil last in a cold-air diffuser? — the 90-day figure and its honest range.
- How long can 400ml last in a scent machine? — the in-box supply as a fixed budget.
- The complete running-cost and consumption guide — this page and the eight around it, in one place.
- Brand: the SOSA founder story.
Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body, on how much fragrance oil a cold-air nebulising diffuser consumes and what moves that figure. The 400ml tank capacity, the 90+ days per fill at mid intensity and the adjustable intensity control are manufacturer specifications; the daily, monthly, per-bottle and per-hour figures shown are arithmetic on those specifications rather than measurements, and real consumption varies with intensity setting, run hours, connected volume, ceiling height, ventilation and season. SOSA does not publish a millilitres-per-hour figure for each intensity step and none is invented here. No health, mood, air-purification or odour-removal claim is made or implied.SOSA Vaayu specifications (verified from the live product page, August 2026): ₹11,999 (the product page displays a rounded ₹12,000). Waterless cold-air nebulisation — pressurised air atomises undiluted fragrance oil into a dry nano-mist; no water, no heat, residue-free. Coverage up to 1000m³, about 2,000–3,000 sq ft. 400ml refillable tank, 90+ days per fill at a mid intensity setting. Bluetooth app plus onboard buttons, 1h / 4h / 8h / 24h timers, adjustable mist intensity, auto-stop and key-lock. Under 38 dB. DC 12V / 1A, 5W. 165 × 80.5 × 215 mm, 0.9 kg, black or white. Freestanding or wall / HVAC mount. CE, RoHS and SGS certified. Ships with four SOSA Hotel Collection fragrances at 100ml each (400ml in total) in one of three combos chosen at checkout. SOSA does not currently sell a separate Vaayu refill oil; the 400ml supplied in the box is the fragrance available at the time of writing, and buyers who need long-term supply should confirm current refill availability with SOSA before purchasing. The cold-air oil supplied with the Vaayu is a different product from the water-based Hotel Collection sold for ultrasonic machines (15ml ₹299 · 100ml ₹999 · 300ml ₹1,799), which must not be used in a Vaayu despite sharing scent names. Other SOSA machines: Boond 300ml ₹899 (~150 sq ft) · Sukoon 500ml ₹1,899 (270–320 sq ft) · Megh 6L ₹3,499 (~215 sq ft — a runtime and humidity machine, not a coverage upgrade) · Aangan ₹25,999 (~8,000–10,000 sq ft) · Meenar ₹38,500 (12,000–18,000 sq ft) · Safar car diffuser ₹3,999. Reed diffusers 50ml ₹749–₹849 (6–8 weeks) · 130ml ₹1,249–₹1,349 (14–18 weeks) · duo sets ₹1,498–₹1,598 · oil-only refills 300ml ₹2,399 / 500ml ₹3,499. Runtime, consumption and coverage figures are manufacturer specifications and vary with intensity setting, run hours, ceiling height, ventilation and season; any per-month or per-day figure in this guide is arithmetic on those specifications, not a measurement. Electricity costs vary by state tariff. No claim is made that scenting affects ratings, reviews, bookings, occupancy, revenue, health, mood or air quality. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.