★ SOSA Vaayu · reeds vs cold-air cost
The question is not which is cheaper but which shape of bill you can live with — one that repeats forever, or one that lands once and leaves an unanswered question behind it
★ ★ ★ ★ ★
★★★★★
"I had never separated the money I spend once from the money I spend every quarter. Doing that changed which product I bought."
3,200 sq ft home · planning
★★★★★
"Seven reed positions across the house is a bill that never stops arriving. Nobody had put a yearly number on it for me before."
Seven-position reed setup
★★★★★
"The straight admission that the cold-air side of the sum cannot be finished yet is why I trust the rest of the page."
Vaayu · researching
★★★★★
"Working out that a 130ml is about ten rupees a millilitre and a 500ml refill is seven was the most useful line here."
Refill switch · 130ml
★★★★★
"I run a homestay and capital is the thing I can plan for. A repeating consumable is the thing that quietly eats a season."
Homestay owner · cost planning
★★★★★
"Ended up spending less than I intended because the page kept telling me what my own square footage actually needed."
Two bottles instead of a machine
★★★★★
"I had never separated the money I spend once from the money I spend every quarter. Doing that changed which product I bought."
3,200 sq ft home · planning
★★★★★
"Seven reed positions across the house is a bill that never stops arriving. Nobody had put a yearly number on it for me before."
Seven-position reed setup
★★★★★
"The straight admission that the cold-air side of the sum cannot be finished yet is why I trust the rest of the page."
Vaayu · researching
★★★★★
"Working out that a 130ml is about ten rupees a millilitre and a 500ml refill is seven was the most useful line here."
Refill switch · 130ml
★★★★★
"I run a homestay and capital is the thing I can plan for. A repeating consumable is the thing that quietly eats a season."
Homestay owner · cost planning
★★★★★
"Ended up spending less than I intended because the page kept telling me what my own square footage actually needed."
Two bottles instead of a machine
✓ Reed diffusers from ₹749 · 130ml from ₹1,249 · oil-only refills 300ml ₹2,399 / 500ml ₹3,499 ✓ Vaayu ₹11,999 · waterless cold-air · up to 1000m³ · 400ml tank at 90+ days a fill · 5W ✓ No separate Vaayu refill oil is sold today — the 400ml in the box is the whole supply
Founder Diaries · Large-Space Scenting · Cost Structure
Cold-air is mostly capital: the Vaayu is ₹11,999 once, plus about ₹350 a year of electricity at 5W run continuously on an illustrative ₹8 per unit.
The sum that cannot be finished: SOSA does not currently sell a separate Vaayu refill oil. The 400ml in the box is one full tank, specified at 90+ days. Past that there is no price to put in the column, so this comparison stops there and says so.
Per millilitre, verified: a 50ml bottle is about ₹16 per ml, a 130ml about ₹10, a 500ml refill ₹7.00 (₹3,499 ÷ 500).
SOSA Vaayu₹11,999 · 1000m³The Vaayu is a pump, a nozzle, a control board and a 400ml tank in a 0.9 kg body, 165 × 80.5 × 215 mm, freestanding or wall and HVAC mountable, CE, RoHS and SGS certified. Pressurised air atomises undiluted oil into a dry nano-mist; there is no water and no heat, which is the whole reason it reaches up to 1000m³ where a water-diluted mist reaches a few hundred square feet. The hardware is the purchase; the oil is the only thing that leaves. Spread across three years, ₹11,999 ÷ 36 = ₹333 a month, or ₹11,999 ÷ 1,095 days = ₹10.96 a day — arithmetic, and it assumes a three-year life I cannot verify, since warranty terms are not something I can confirm here. Ask SOSA.
Refill · ₹7.00 per ml₹3,499 / 500mlShop → 
Sukoon · 270–320 sq ft₹1,899Shop → 
Vaayu · up to 1000m³₹11,999Shop →
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.
Almost everyone who writes to me about the cost of scenting a large house asks the wrong question first. They ask which is cheaper. The more useful question is which shape of cost you are agreeing to — because a reed diffuser is one hundred per cent consumable and nought per cent capital, and a cold-air machine is almost entirely the reverse. Those two bills behave completely differently over three years, they land on different people in a household or a business, and only one of them can be finished on paper today.
Quick answers — read this first
Reeds are pure consumable: nothing you buy is durable except the glass. Seven 130ml positions cost ₹9,143 to start (itemised below) and roughly ₹2,624 per position per year after that on 500ml oil-only refills — arithmetic on ₹3,499 ÷ 16 months × 12.Cold-air is mostly capital: the Vaayu is ₹11,999 once, plus about ₹350 a year of electricity at 5W run continuously on an illustrative ₹8 per unit.
The sum that cannot be finished: SOSA does not currently sell a separate Vaayu refill oil. The 400ml in the box is one full tank, specified at 90+ days. Past that there is no price to put in the column, so this comparison stops there and says so.
Per millilitre, verified: a 50ml bottle is about ₹16 per ml, a 130ml about ₹10, a 500ml refill ₹7.00 (₹3,499 ÷ 500).
The short answer
Short answer: for a large home, reed diffusers are cheap to start and expensive to keep, while cold-air nebulisation is expensive to start and — on the evidence available today — impossible to price beyond the first three months. If you want a bill you can budget for once and forget, cold-air is the shape you want, with a supply question to settle first. If you want to spend nothing large and can live with a recurring line, reeds are the shape you want.
The mechanism behind the money: a reed diffuser has no durable component. Oil wicks up six fibre reeds and evaporates, the oil is gone, and the reeds are consumed too — SOSA does not sell replacement reeds separately, which is a real gap in our range. A cold-air nebuliser is a pump, a nozzle and a control board that atomise undiluted oil; the hardware persists and only the oil leaves. That single difference produces every number on this page.
In this guide
The capital route
SOSA Vaayu · ₹11,999
The consumable route, done well
500ml oil refill · ₹3,499
The middle rung
Sukoon · ₹1,899
Straight answer
Over a large home, do reed diffusers or cold-air scenting cost less?
1. Reeds cost nothing to begin and never stop costing. Seven positions in a large house, bought as 130ml bottles: three Mountain Breeze at ₹1,349 = ₹4,047, two Evening Calm at ₹1,299 = ₹2,598, two Morning Freshness at ₹1,249 = ₹2,498. ₹4,047 + ₹2,598 + ₹2,498 = ₹9,143. That is arithmetic on verified prices, not an estimate.
2. After that the reed bill repeats forever. A 500ml oil-only refill at ₹3,499 runs one position for 14–18 months. Taking the midpoint of 16 months: ₹3,499 ÷ 16 = ₹218.69 a month, × 12 = ₹2,624 a year per position. Seven positions: ₹2,624 × 7 = ₹18,368 a year, labelled as arithmetic on SOSA's own stated refill duration.
3. Cold-air front-loads almost everything. The Vaayu is ₹11,999 once, covers up to 1000m³ — about 2,000–3,000 sq ft depending on ceiling height — and draws 5W. Run continuously that is 0.12 units a day, 43.8 units a year, about ₹350 at an illustrative ₹8 per unit. Tariffs vary by state and that is arithmetic, not a bill.
4. The consumable column on the cold-air side cannot be completed. The machine ships with four 100ml cold-air fragrances — 400ml, exactly one tank, specified at 90+ days per fill. SOSA does not currently sell a separate Vaayu refill oil. I will not invent a price for something we do not sell, so the comparison stops at the end of that first fill and says so plainly.
5. The water-based Hotel Collection is not the missing number. The Hotel Collection at 15ml ₹299, 100ml ₹999 and 300ml ₹1,799 is made for ultrasonic machines. It shares scent names with the cold-air oils and is a different product. It does not go in a Vaayu and it is never a Vaayu refill price.
6. If your connected space is under about 800 sq ft, none of this applies to you. Two reed diffusers at opposite ends, or one Sukoon at ₹1,899, and you are done for a tenth of the money.
Our reed fragrances are composed and handmade in small batches in Pune, the Vaayu is made in India, and a portion of every order supports girl-child education through Nanhi Kali.
2. After that the reed bill repeats forever. A 500ml oil-only refill at ₹3,499 runs one position for 14–18 months. Taking the midpoint of 16 months: ₹3,499 ÷ 16 = ₹218.69 a month, × 12 = ₹2,624 a year per position. Seven positions: ₹2,624 × 7 = ₹18,368 a year, labelled as arithmetic on SOSA's own stated refill duration.
3. Cold-air front-loads almost everything. The Vaayu is ₹11,999 once, covers up to 1000m³ — about 2,000–3,000 sq ft depending on ceiling height — and draws 5W. Run continuously that is 0.12 units a day, 43.8 units a year, about ₹350 at an illustrative ₹8 per unit. Tariffs vary by state and that is arithmetic, not a bill.
4. The consumable column on the cold-air side cannot be completed. The machine ships with four 100ml cold-air fragrances — 400ml, exactly one tank, specified at 90+ days per fill. SOSA does not currently sell a separate Vaayu refill oil. I will not invent a price for something we do not sell, so the comparison stops at the end of that first fill and says so plainly.
5. The water-based Hotel Collection is not the missing number. The Hotel Collection at 15ml ₹299, 100ml ₹999 and 300ml ₹1,799 is made for ultrasonic machines. It shares scent names with the cold-air oils and is a different product. It does not go in a Vaayu and it is never a Vaayu refill price.
6. If your connected space is under about 800 sq ft, none of this applies to you. Two reed diffusers at opposite ends, or one Sukoon at ₹1,899, and you are done for a tenth of the money.
Our reed fragrances are composed and handmade in small batches in Pune, the Vaayu is made in India, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: reeds are all consumable — ₹9,143 to start seven positions, then about ₹18,368 a year on 500ml refills, as arithmetic. Cold-air is mostly capital — ₹11,999 once plus roughly ₹350 a year of electricity, and then a supply question nobody can price today because no Vaayu refill oil is sold. Choose the shape, not the total.
The consumable line, at its cheapest
SOSA reed diffuser refill · oil only ₹3,499 / 500ml
If your house is going to run six or eight reed positions, this is the single line that decides whether the plan survives year two. Oil alone — you keep the glass vessels you already own — at ₹3,499 ÷ 500 = ₹7.00 per millilitre against ₹1,299 ÷ 130 = ₹9.99 for a fresh 130ml bottle and roughly ₹16 per millilitre for a 50ml. The 300ml at ₹2,399 works out at ₹8.00 per millilitre and runs a position 8–11 months; the 500ml runs 14–18. Remove the reeds, pour to the neck, return the reeds, flip once so both ends are coated. Five compositions, the same formula as the bottles. Reeds themselves are not sold separately — a real gap, and our guidance is to refresh them every few months.
Part one — capital and consumable are two different animals
Accountants separate money spent on a thing you keep from money spent on a thing you use up, and it is a distinction worth borrowing here because home fragrance sits almost entirely at one extreme or the other. There is no such thing as a reed diffuser you own; there is only reed diffuser you are currently using. And there is very little about a cold-air machine that gets used up beyond the oil in its tank. Once you see the two products in those terms, the arguments people have about which is "expensive" mostly dissolve, because they are arguing about different columns of the same page.
1
SHAPE ONE · ALL CONSUMABLE
A reed diffuser leaves nothing behind but glass
Every rupee you spend on a reed diffuser is spent on something that will evaporate. The oil goes; the six fibre reeds are also consumed, slowly clogging with the heavier part of the composition until they deliver a fraction of what they did in week one. The glass vessel is genuinely durable and genuinely reusable, and it is also the cheapest component of the object. So the honest way to describe reed economics in a large house is a subscription you did not knowingly sign. Seven positions at ₹2,624 a year each — arithmetic on a ₹3,499 refill over its stated 16-month midpoint — is ₹18,368 a year, every year, for as long as you want the house to smell of anything. That is not a criticism of the format. It is what a format with no durable part costs.
The gap, named: we do not sell replacement reeds separately. Refills are oil only, and reeds want refreshing every few months.
2
SHAPE TWO · MOSTLY CAPITAL
A cold-air machine is a durable object with a small appetite
SOSA Vaayu₹11,999 · 1000m³The Vaayu is a pump, a nozzle, a control board and a 400ml tank in a 0.9 kg body, 165 × 80.5 × 215 mm, freestanding or wall and HVAC mountable, CE, RoHS and SGS certified. Pressurised air atomises undiluted oil into a dry nano-mist; there is no water and no heat, which is the whole reason it reaches up to 1000m³ where a water-diluted mist reaches a few hundred square feet. The hardware is the purchase; the oil is the only thing that leaves. Spread across three years, ₹11,999 ÷ 36 = ₹333 a month, or ₹11,999 ÷ 1,095 days = ₹10.96 a day — arithmetic, and it assumes a three-year life I cannot verify, since warranty terms are not something I can confirm here. Ask SOSA.
Electricity: 5W × 24 hrs = 0.12 units a day. 0.12 × 365 = 43.8 units a year — around ₹350 at an illustrative ₹8 per unit. Tariffs vary by state.
3
THE THIRD COLUMN
Attention is a cost, and it lands on a different person
Neither of the two figures above captures the cost that people actually complain about. A reed position asks to be flipped weekly and replaced every 14–18 weeks on a 130ml. Seven positions at two minutes a flip is 14 minutes a week, which is ₹0 and 12 hours a year. A Vaayu asks for one tank fill per 90+ days and a schedule set once from the app or the onboard buttons, with 1h, 4h, 8h and 24h timers and a key-lock so nobody else changes it. In a household that cost is invisible. In a serviced property it is a line item with a name on it. I am deliberately not converting it into rupees, because your staff cost is yours to know and I would be inventing a number if I guessed at it.
Part two — the same large home, both ways, line by line
Take a 2,400 sq ft home at an 11 ft ceiling — roughly 26,400 cubic feet, about 748m³ once you divide by 35.3 — with seven positions that need scent: a connected living-dining, an entrance, three bedrooms and two bathrooms. Everything below is arithmetic on verified prices, and where a figure cannot be produced I have said so instead of estimating.
Capital against consumable
Seven reed positions vs one cold-air machine, over three years
| Line | Reed diffusers · 7 positions | Cold-air · one Vaayu | Which kind of cost |
|---|---|---|---|
| Day one ★ | ₹4,047 + ₹2,598 + ₹2,498 = ₹9,143 | ₹11,999 | Consumable vs capital |
| What you still own at month 6 | Seven glass vessels and tired reeds | The whole machine | Nothing vs everything |
| Fragrance included | 910ml across seven 130ml bottles | 400ml — four 100ml cold-air fragrances | Both finite |
| Stated duration of that fragrance | 14–18 weeks per position | 90+ days for one full tank | Comparable, roughly |
| Year one consumable after that | ₹2,624 × 7 = ₹18,368 on 500ml refills | Cannot be priced — no refill oil is sold | Known vs unknown |
| Electricity | Nil — no power at all | 0.12 units/day → 43.8 units/yr ≈ ₹350 | Small either way |
| Attention per week | Seven flips, about 14 minutes | None — one fill per 90+ days | Time, not money |
| Reach of the spend | ~250–300 sq ft of open air per bottle | Up to 1000m³ · ~2,000–3,000 sq ft | Many small vs one large |
| Survives a power cut | Yes, completely | No | A real difference in India |
| The honest caveat: the row that matters most is the one I cannot complete. SOSA does not currently sell a separate Vaayu refill oil. The 400ml supplied in the box is one full tank and the whole supply available today, so the three-year cold-air column genuinely stops after the first 90+ days. The water-based Hotel Collection is a different product for ultrasonic machines and is never a substitute. If continuous long-term supply matters to you, ask SOSA where things stand before you spend ₹11,999. | |||
Shop this guide
The three things this comparison comes down to
Refill · ₹7.00 per ml₹3,499 / 500mlShop → Sukoon · 270–320 sq ft₹1,899Shop → Vaayu · up to 1000m³₹11,999Shop →
The SOSA principle
A reed diffuser has no durable part. A cold-air machine is almost entirely durable part.
Everything else on this page is a consequence of that one sentence — including the column I cannot fill in, which exists because the durable object needs an oil we do not yet sell separately.
Part three — the column I cannot fill in, and what to do about it
A cost comparison is only honest if it names its own missing data, so here is mine, stated once and plainly. The Vaayu arrives with four 100ml cold-air fragrances, 400ml in total, which is exactly one full tank, and the specification is 90+ days per fill at a mid intensity setting. SOSA does not currently sell a separate Vaayu refill oil. That means the three-year running cost of cold-air scenting is not a number I am withholding or rounding — it is a number that does not exist at the time of writing, and any page that quotes you one is either guessing or quoting the price of a different product.
The different product is the one to be careful about, because the confusion is easy to fall into. Our water-based Hotel Collection — 15ml ₹299, 100ml ₹999, 300ml ₹1,799, which is ₹19.93, ₹9.99 and ₹6.00 per millilitre respectively — carries the same scent names as several of the cold-air fragrances. It is formulated for ultrasonic machines, which vibrate water into a mist and carry a diluted fragrance on it. A cold-air nebuliser runs neat oil through a pump and a nozzle; a water-based fluid is the wrong viscosity and the wrong chemistry for that mechanism. It is not a refill, it is not a cheaper alternative to a refill, and I will not let it stand in for the missing figure on this page just to make a table look complete.
So what should you actually do with that? Two things. First, if you are the kind of buyer for whom uninterrupted supply is central — a homestay running a signature scent across a whole season, someone who will be genuinely annoyed in month four — write to SOSA and ask where refill availability stands before you order, and treat the answer as part of the purchase decision rather than an afterthought. Second, if you are buying for a defined stretch of use rather than perpetual running — a wedding season at home, three months of visitors, a house you occupy part of the year — then the 400ml in the box may be precisely the amount you need, and the unanswered column stops mattering. Those are two different buyers and only one of them should be spending ₹11,999 today. The reed side has no equivalent uncertainty: refills exist, they are priced, and ₹2,399 and ₹3,499 are on the shelf.
I would rather publish a table with an empty cell in it than fill that cell with a number I made up.
— Sonal Sahani, SOSA
Part four — which shape of cost suits which buyer
The same house can justify either answer depending on who is paying and how they think about money. Below is how I would sort it, with prices as they stand in August 2026.
Matching the bill to the buyer
Five buyers, five honest answers
| If this is you | The shape you want | What to buy | Price |
|---|---|---|---|
| Under ~800 sq ft connected, one problem room ★ | Neither ledger — this is not a large-space problem | Two 50ml reeds at opposite ends, or one Sukoon | ₹1,548–₹1,899 |
| You hate large single payments | All consumable, spread thin | 130ml bottles position by position, then oil refills | ₹1,249–₹1,349 each |
| You budget capital annually and hate recurring lines | Mostly capital — with the supply question settled first | Vaayu for the connected volume, reeds behind closed doors | ₹11,999 + reeds |
| You want scent on demand in one big room | Small capital, cheap consumable | Sukoon 270–320 sq ft + Hotel Collection 300ml at ₹6.00/ml | ₹1,899 + ₹1,799 |
| You want to refill less often, not reach further | Capital that buys runtime only | Megh — 6L, ~100 hrs, but ~215 sq ft, less than the Sukoon | ₹3,499 |
| You need supply certainty above all | The known ledger | Reeds, and ask SOSA about Vaayu refills before reconsidering | From ₹749 |
Honest notes for buyers: every figure on this page is arithmetic on verified August 2026 prices and manufacturer specifications, not a measurement of your house. Reed durations (50ml 6–8 weeks, 130ml 14–18 weeks) and refill durations (300ml 8–11 months, 500ml 14–18 months) vary with reed count, room volume, ventilation and season, so the per-year figures move with them. Electricity is computed from the Vaayu's stated 5W at an illustrative tariff; state tariffs differ and no bill is being quoted. SOSA does not currently sell a separate Vaayu refill oil — the 400ml in the box is today's whole supply, and the water-based Hotel Collection is a different product for ultrasonic machines that must never be used in a Vaayu. Replacement reeds are not sold separately either; refresh them every few months. The Megh at ₹3,499 covers around 215 sq ft — less than the ₹1,899 Sukoon — and is a runtime and humidity machine, never a coverage upgrade. Warranty, AMC, installation, spare parts and app platform are not verified here; ask SOSA. Stand reed bottles on a tray, as the oil marks wood and stone, and keep everything away from children and pets. Nothing here is a health, mood, sleep or air-purification claim, and no claim is made that scenting affects ratings, reviews, bookings, occupancy or revenue.
The cheapest way to own a large house's worth of scent
SOSA Mountain Breeze 130ml · pine, sage & Indian cedar ₹1,349 / 130ml
In a large home the 130ml is the size that makes the consumable ledger bearable — ₹1,349 ÷ 130 = ₹9.99 per millilitre against roughly ₹16 for a 50ml, and 14–18 weeks per position instead of 6–8, which cuts the number of times someone has to think about it from eight a year to three. Himalayan pine over clarifying sage and deodar cedar, on an alcohol-free, phthalate-free, heat-stable coconut-derived CCT base tested through 45°C heat and 85% monsoon humidity. Six fibre reeds rather than rattan, whose pores clog in Indian humidity. It sits at 9.4 on SOSA's own internal strength scale at six reeds — our scale, not an industry standard, and not a concentration.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
The reason I put this page together as two columns rather than one total is that I have watched too many people compare a purchase price with a purchase price and then feel misled a year later. ₹9,143 of reed diffusers is not cheaper than an ₹11,999 machine; it is a different financial object entirely, and it will have cost more than the machine by somewhere in the middle of year two if the house keeps running seven positions. Saying that costs me a sale sometimes, and I would still rather say it.
What I will not do is finish the other column with an invented number. We do not currently sell a separate refill oil for the Vaayu. That is inconvenient, it is the first thing a careful buyer notices, and it is the reason a genuinely useful cost page has an empty cell in it. If perpetual supply is central to your plan, ask us where we are before you order rather than after.
And the answer that suits most of the people who write to me is neither column. A flat, a normal-ceilinged house, one open living-dining that defeats a single bottle — that is two reed diffusers at opposite ends, or a Sukoon at ₹1,899, and the money stays in your pocket. Everything we compose is handmade in small batches in Pune, the Vaayu is made in India, and a portion of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
Over three years, are reed diffusers cheaper than a cold-air machine?
For a small number of positions, comfortably yes. For a large home running seven positions, the reed side is about ₹9,143 to start plus roughly ₹18,368 a year of refills as arithmetic on ₹3,499 ÷ 16 months × 12 × 7 — which passes ₹11,999 during year two. The cold-air side is ₹11,999 plus about ₹350 a year of electricity, and then a consumable figure that cannot be produced because no Vaayu refill oil is currently sold.
How much does a Vaayu cost to run per day?
Electricity is straightforward: 5W run continuously is 0.12 units a day, 43.8 units a year, roughly ₹350 at an illustrative ₹8 per unit — tariffs vary by state and that is arithmetic rather than a bill. Amortising the hardware over three years is ₹11,999 ÷ 1,095 = ₹10.96 a day. The fragrance component cannot be added to that, because the 400ml in the box is the whole supply sold today.
Can I buy refill oil for the Vaayu to keep the running cost down?
Not from SOSA at the time of writing. The machine ships with four 100ml cold-air fragrances — 400ml, one full tank, specified at 90+ days per fill — and no separate Vaayu refill oil is currently sold. The water-based Hotel Collection is for ultrasonic machines and must not be used in a Vaayu despite the shared scent names. If long-term supply matters, confirm the position with SOSA before ordering.
Is a 130ml bottle better value than a 50ml?
On price per millilitre, clearly: ₹1,299 ÷ 130 = ₹9.99 against ₹799 ÷ 50 = ₹15.98. It also lasts 14–18 weeks instead of 6–8, which matters in a large house where somebody has to remember seven positions. What it does not do is smell stronger — at the same six reeds it projects the same. Size buys duration, not reach.
Would a bigger ultrasonic machine be the cheap middle answer?
Not for coverage. The Megh at ₹3,499 has a six-litre tank and around 100 hours of runtime, but covers only about 215 sq ft — less than the ₹1,899 Sukoon's 270–320. It is a runtime and humidity machine and I say so every time it comes up. If you want reach rather than fewer refills, the jump is to cold-air, not to a bigger tank.
Reeds vs cold-air · cost structure · 2026
Do not compare the totals. Compare the shapes — one repeats forever, the other lands once
Reed diffusers 50ml ₹749–₹849 (6–8 weeks) and 130ml ₹1,249–₹1,349 (14–18 weeks), six fibre reeds; oil-only refills 300ml ₹2,399 at ₹8.00 per ml and 500ml ₹3,499 at ₹7.00 per ml. Sukoon ₹1,899 (270–320 sq ft), Megh ₹3,499 (~215 sq ft — runtime and humidity, never coverage), Vaayu ₹11,999 (waterless cold-air, up to 1000m³, 400ml tank at 90+ days a fill, 5W, under 38 dB). No separate Vaayu refill oil is sold today — ask SOSA before planning long-term supply. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
See the Vaayu → Oil refills from ₹2,399
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More on what large-space scenting costs
- One machine vs five reed diffusers — the multi-year arithmetic, done in full.
- The same villa, costed three ways — reeds, ultrasonic and cold-air side by side.
- What should you budget? — four tiers with a named kit and a total at each.
- Is the Vaayu worth the investment? — the verdict, and who should wait.
- 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 the difference between capital and consumable cost in large-space home fragrance. Every rupee figure on this page is arithmetic on verified August 2026 SOSA prices and published manufacturer specifications, clearly labelled as such; none of it is a measurement of a specific property or a quotation of an electricity bill. Reed bottle and refill durations are SOSA's own working guidance and vary with reed count, room volume, ventilation and season. Electricity figures use the Vaayu's stated 5W draw at an illustrative tariff; state tariffs differ. Warranty length, AMC, installation service, spare parts and app platform are not verified — confirm with SOSA. Nothing here is a health, wellness, mood, air-purification or odour-elimination claim, and no claim is made that scenting affects ratings, reviews, bookings, occupancy or revenue.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.