Founder Diaries · The Business Case · Branding, Repeat Listings & Economics
By Sonal Sahani · ISIPCA Versailles 11 min read Updated September 2026
At your volume the arithmetic is not the interesting part, but we should do it anyway because it settles the question in one line.
Twenty viewings a month is 240 a year, and a ₹11,999 machine across 240 viewings is a shade under ₹50 each in the first twelve months — after which the machine is paid for and the only running cost is oil. Set that against the ₹10,000 to ₹25,000 you already spend on photography for a single listing and the question answers itself. What is genuinely worth your time is the second half of this page: how many machines, how you move one between properties, and what happens on a Saturday when your three viewings are in three different buildings.
Quick answers — read this first
The arithmetic: 20 viewings a month is 240 a year. ₹11,999 across 240 is just under ₹50 a viewing in year one. In year two the machine is paid for and only the oil costs anything.
The comparison that matters: you already spend ₹10,000–₹25,000 on photography and a few thousand on a deep clean for a single listing. Both are spent into that listing. The machine is not.
The honest recommendation at this volume: usually two
Vaayu machines rather than one, so a Saturday with viewings in three buildings does not become a driving problem. Buy the second after the first has been through a quarter.
The logistics: 0.9 kg, smaller than a shoebox, two minutes to place and two minutes to collect, key-locked so it can be left in a vacant flat between viewings.
The short answer
Short answer: at 240 viewings a year, yes — because the cost divides across every viewing you will ever run and the machine is not used up by the property it is used in, which is what separates it from a clean, a shoot or hired furniture. That is the entire economic case, and it makes no claim about what scent does to an offer or a sale.
The pick: a
Vaayu at ₹11,999 — waterless, up to 1000 m³, 400ml tank, 1h/4h/8h/24h timers, under 38 dB, auto-stop, key-lock, 0.9 kg — and at twenty viewings a month, a second identical unit once the first has proved itself, bought for Saturdays rather than for coverage.
Shop: the
Vaayu at ₹11,999 with four hotel-inspired scents included;
Hotel Collection at ₹299 for 15ml, ₹999 for 100ml and ₹1,799 for 300ml; the
Sukoon at ₹1,899 for a single room; the
Aangan at ₹25,999 for a sales gallery rather than a flat. Free shipping above ₹499.
Straight answer
I show 20 premium properties a month — is professional scenting worth investing in?
1. Do the division first, because it is the whole financial question. Twenty viewings a month is 240 a year. ₹11,999 divided by 240 is just under ₹50 a viewing in the first year. Keep the machine three years at the same volume and the same purchase has spread across roughly 720 viewings.
2. Then compare it with what you already spend. Photography on one listing is ₹10,000 to ₹25,000. A deep clean is a few thousand. Hired furniture for a vacant flat starts around ₹15,000. Every one of those is spent into a single property. The machine is not — it comes home with you.
3. That is the entire argument, and it is not a return. Nothing here claims scent affects an offer, a price or how quickly something sells. The case is that it is a fixed cost with an unusually large denominator, and at your volume the denominator is large.
4. At twenty a month, plan on two machines rather than one. Not for coverage — one
Vaayu covers up to 1000 m³, which is most flats. For Saturdays, when three viewings in three buildings each need two hours of lead time that overlap.
5. Buy the second one after the first has done a full quarter. Prove the routine before you duplicate it. If in three months you have not once wished for a second machine, you do not need one and you have saved ₹11,999.
6. And build the handling into your process rather than your memory. Two minutes to place, two minutes to collect, key-lock on, and a single named person who knows where each unit is. A machine nobody can find on a Friday is not a fixed cost, it is a loss.
A portion of every order supports girl-child education through Nanhi Kali.
TL;DR: 240 viewings a year makes ₹11,999 a shade under ₹50 a viewing in year one, and oil alone after that, against ₹10,000–₹25,000 of photography spent into one listing. The machine is not consumed by the property it is used in. At twenty a month plan on two Vaayu units — the second bought once the first has done a quarter — because a Saturday in three buildings is a logistics problem, not a coverage one.
One purchase, divided by two hundred and forty
SOSA Vaayu · the fixed-cost machine ₹11,999
Twenty viewings a month is 240 a year, and ₹11,999 across 240 is a shade under ₹50 a viewing in the first twelve months. Run the same machine for a third year and the same purchase is spread across roughly 720 viewings, because the machine is not used up by the property it is used in — it comes home in the boot and does the next one. Up to 1000 m³, a 400ml tank rated at about 75 days of continuous running and considerably more than that at two hours a viewing, 1h/4h/8h/24h timers, auto-stop, key-lock, 0.9 kg. Four hotel-inspired scents included, which covers the first several months of oil.
Two hundred and forty viewings, divided
Let me put the numbers where you can see them, because agents at this volume are usually being sold on atmosphere and what they actually need is a denominator. Twenty viewings a month is 240 a year and somewhere near 720 over the life of a machine you look after. A ₹11,999 purchase across the first 240 is just under ₹50 a viewing; across 720 it is closer to ₹17. Nothing about those figures depends on the scent doing anything to a buyer, which is deliberate — this is a cost calculation, not a return calculation, and I am not going to convert it into one further down the page. The reason the number is that small is a property of the object rather than of the fragrance: the machine is not consumed by the flat it spends an afternoon in. It goes back in the boot and does the next one.
1
THE DENOMINATOR
Why the same purchase costs a different amount for different agents
The first thing to understand is that this product has no single price in practice. An agent doing two viewings a month pays about ₹500 a viewing for the same ₹11,999 machine in its first year. At five a month it is ₹200, at ten it is ₹100, at your twenty it is under ₹50, and at forty it is ₹25 — one object, one price tag, and a twentyfold difference in what it actually costs to use. That is not a marketing trick, it is what fixed costs do, and it is the reason this question has a different honest answer for a broker doing occasional resales than it does for you. It also explains why the machine gets cheaper the longer you keep it, which is not true of anything else on your preparation list. A photograph commissioned for a listing is worth nothing on the next listing. Hired furniture goes back to the hire company. A deep clean is undone by the first family who cook in the flat. The machine is the only line in the whole exercise whose cost per use falls every single month you own it, and at 240 viewings a year it falls fast. Put against that the running cost, which is oil. The 400ml tank is rated at about 75 days of continuous running, and you are not running continuously — you are running two hours before a viewing, so a fill covers a great many properties. Four hotel-inspired scents come with the machine, which in practice means your first several months of listings cost you nothing beyond the purchase.
2
AGAINST WHAT YOU ALREADY SPEND
Photography, cleaning, and the difference between spending and buying
Now set it beside the lines already on your sheet, because that comparison is more useful than any standalone number. A proper photography or videography package on a premium listing runs from ₹10,000 to ₹25,000, and a professional deep clean is a few thousand — so the machine costs roughly what one good shoot costs, or three or four cleans, and unlike any of them it is not attached to a property. That is the distinction I would build your thinking around: some of what you spend is purchased and some of it is consumed. Photography, styling, hire furniture and cleaning are consumed. They go into one flat, they stay there, and when the flat sells they are gone. Equipment is purchased. It belongs to your business, it appears on the next listing and the one after, and the only thing that ends its usefulness is you dropping it. Which means the honest place for a machine on your accounts is not the per-listing preparation budget at all — it is the same shelf as your camera, your measuring wheel and your key safe, bought once for the business. I would add one boundary here because at high volume it gets tested: none of this is an argument for scenting a property that has something wrong with it. A smell with a cause — damp, a leak, a drain, smoke — is a material fact about the property. Find it, fix it or disclose it. Volume is a reason to have good equipment; it is never a reason to lower the line.
3
THE PART THAT ACTUALLY BITES
Saturday, three buildings, and two hours of lead time each
Then the operational question, which is the one agents at twenty a month actually write to me about, and it has nothing to do with money. A property wants roughly two hours at a low setting before its buyer arrives, so that it has reached its level rather than being caught climbing. Two hours is fine on a Wednesday with one viewing. On a Saturday with eleven o'clock in one building, one o'clock in another and four o'clock across town, a single machine has to be in three places with overlapping lead times, and it cannot be. What people do instead is compress the lead time to twenty minutes for the second and third properties, which produces exactly the effect the whole exercise is meant to avoid — a flat still climbing while somebody is standing in it. Or they drive back for the machine between viewings, which costs an hour of a Saturday and puts a ₹11,999 object in a car in traffic twice more than necessary. Two machines dissolve the problem: place one on Friday evening in the flat that has an eleven o'clock, place the other on Saturday morning in the one o'clock, and collect both on the way home. The key-lock and auto-stop are what make leaving one in a vacant property overnight a reasonable thing to do rather than a worry — nothing to tamper with, nothing running unattended without a stop, and at 5W the electricity is trivial. The one thing I would not do is buy both at once. Run one for a quarter. If you find yourself wishing for the second on three separate Saturdays, buy it; if you never do, you have kept ₹11,999 and learned something about your own diary.
The logistics rule I would write into your process on day one: one named person, one place the machines live when they are not in a flat, and a line on the listing sheet saying which unit is where. Equipment that nobody owns is equipment that goes missing in the third month.
The cost per viewing at every volume
The same ₹11,999 machine, priced by how much you actually use it. The first-year column is the purchase divided by that year's viewings; the third-year column is the same purchase divided by three years of them, which is the number that matters if you look after it. The last column is the honest verdict at each volume, including the two where the verdict is no.
One price, many costs
What a ₹11,999 machine actually costs per viewing
| Viewings a month |
A year |
Year one, per viewing |
Across three years |
Honest verdict |
| 20 a month ★ |
240 |
just under ₹50 |
about ₹17 |
Your case. Clearly worth it as equipment, and plan for a second unit |
| 40 a month |
480 |
about ₹25 |
about ₹8 |
A team rather than an agent. Two or three machines and a named custodian |
| 10 a month |
120 |
about ₹100 |
about ₹33 |
Comfortably worth it on one machine. No second unit needed |
| 5 a month |
60 |
about ₹200 |
about ₹67 |
Defensible, and the point at which it stops being obvious |
| 2 a month |
24 |
about ₹500 |
about ₹167 |
I would not. Air the flat properly and spend the money on a deep clean |
| Occasional |
under 12 |
over ₹1,000 |
over ₹330 |
No. A reed at ₹749 in a long listing, or nothing at all |
Shop this guide
A twenty-a-month setup, in three products
The SOSA principle
Every other line on your preparation sheet is spent into the property and stays there. The machine is the only one that comes back down in the lift with you.
Photography belongs to one listing. Hire furniture goes back. A clean is undone by the first dinner. Equipment is the only item whose cost per use falls every month you own it.
One machine or two, and what a Saturday does to the answer
Start with what a single machine can genuinely cover, because people confuse a coverage problem with a scheduling problem and buy the wrong solution. One Vaayu is rated up to 1000 m³, which is roughly 2,000 to 3,000 sq ft, so for the overwhelming majority of premium apartments the answer to how many machines a property needs is one. A 3,000 sq ft flat at a ten-foot ceiling is about 850 cubic metres and the machine is running at well under its rating. Where a single unit genuinely runs out is a villa with double-height volumes, or a floor plate above about 8,000 sq ft, which is where the Aangan at ₹25,999 and its 3,000 m³ becomes the correct machine rather than an upsell — and I would not put an Aangan into an apartment however expensive the apartment is. So the second unit at your volume is not about square footage at all. It is about the fact that two hours of lead time cannot be in two places at once. Think of it as buying a second slot in your Saturday rather than a second machine, and the ₹11,999 makes immediate sense. The alternative purchases people consider here are worth naming: a Sukoon at ₹1,899 as a cheap second unit is tempting and is the wrong instinct, because it is ultrasonic and puts 30 to 50 ml of water an hour into a closed flat, which is the last thing a vacant property in monsoon needs.
Then the handling routine, which at 240 viewings a year has to be a process rather than an intention. Placing a machine is genuinely a two-minute job: it goes in the entrance zone, at waist height or above, at the edge of the space rather than in the doorway itself, out of the direct path of an air-conditioning vent, and on a timer that has it at level before the buyer arrives. Collection is the same two minutes in reverse, and the key-lock means nothing has been fiddled with in between. At 165 × 80.5 × 215 mm and 0.9 kg it lives in a small bag in your boot with its adaptor, and I would keep a spare adaptor there too, because the single most common way this routine breaks is a power lead left plugged in behind a console table in a flat you handed back on Tuesday. Label each unit. Keep a line on the listing sheet that says which unit is where and when it needs collecting. If you have staff, one person owns the equipment, the way one person owns the keys. None of this is complicated and all of it is the difference between a fixed cost and a slowly disappearing one — I have had two agents in three years write to me about replacing a machine that was not broken, only unaccounted for.
Then the free work, which at your volume matters more than at anybody else's because you are doing it 240 times. A machine placed in a flat that has been shut for a fortnight is being asked to do a job that opening two windows would have done better and at no cost. Twenty-four hours before, get the property open with windows on opposite walls, run every tap, and pour water down every drain trap — a dry trap is the commonest bad smell in a vacant Indian flat and it is a two-minute fix, not a fragrance problem. Three hours before, close up and let the flat come to temperature. Two hours before, the machine goes on low. Thirty minutes before, walk in through the front door as a buyer would and adjust down if anything is noticeable, never up. That sequence is the same whether the property is ₹2 crore or ₹20 crore and it is what the ₹50 a viewing is buying its place at the end of. And the line that does not move at any volume: if the walk-through turns up a smell with a cause, the machine stays in the bag. Damp, a leak, a blocked drain, smoke damage, anything structural — that is a material fact about the property, and the answer is to find it, fix it or disclose it. At 240 viewings a year you will meet several of these, and how you handle them is worth considerably more to your business than how any of the other 235 smelled.
A photograph belongs to one listing. A machine belongs to your business, and every viewing you run after the first one makes it cheaper.
— Sonal Sahani, SOSA
The SOSA edit
In buying order for an agent running twenty premium viewings a month. The second row is the purchase most people at this volume make eventually and almost nobody should make on day one, and the last row is the machine I would talk you out of.
The SOSA edit
A 240-viewings-a-year setup, in buying order
| Buy |
What it is |
When it earns its place |
Price |
| 1. Vaayu ★ |
Waterless, up to 1000 m³, 400ml, 1h/4h/8h/24h timers, under 38 dB, auto-stop, key-lock, 0.9 kg |
First and immediately. Just under ₹50 a viewing in year one, oil alone after that |
₹11,999 |
| 2. A second Vaayu
|
An identical unit, so two properties can both have two hours of lead time on the same day |
After a full quarter, and only if you have actually wished for it on three Saturdays |
₹11,999 |
| 3. Oil, in the size that suits
|
The machine ships with four hotel-inspired scents, which covers the first months at viewing hours |
The only recurring cost in the whole exercise. Buy 15ml at ₹299 while deciding, larger once settled |
from ₹299 |
| 4. Reed diffusers
|
Alcohol-free, no socket, no schedule, 24–72 hours to reach their working level |
For the listing that is shown weekly for months and does not deserve a machine trip each time |
from ₹749 |
| 5. Sukoon
|
500ml ultrasonic, 270–320 sq ft, three 15ml scents included |
Your own office or a small cabin. Not as a cheap second unit for flats — it is water-based |
₹1,899 |
| Not for a flat: Aangan
|
Up to 3,000 m³, HVAC or standalone, 800ml, under 42 dB |
Sales galleries, clubhouses and very large villas only. In an apartment it is ₹14,000 of nothing |
₹25,999 |
Honest notes for buyers: fragrance is the last step in preparing a property, never the first, and it must never be used to cover a defect. Damp, a leak, drains, smoke or anything structural is a material fact about a property: find it, fix it or disclose it. Scent a listing that is genuinely sound. On the machines: the
Vaayu at ₹11,999 is waterless cold-air nebulisation — no water, no heat and no dampness — covering up to 1000m³ or roughly 2,000–3,000 sq ft, with a 400ml tank lasting about 75 days, Bluetooth app control, 1h/4h/8h/24h timers, under-38dB running, auto-stop and a key-lock, at 0.9 kg and smaller than a shoebox, so one machine can serve a whole portfolio. The
Aangan at ₹25,999 covers up to 3,000m³ for sales galleries and clubhouses. The ultrasonic
Sukoon,
Boond and
Megh are water-based and add 30–50 ml of water an hour to the air, which makes them the wrong choice for a closed or humid vacant property. A
reed diffuser needs 24–72 hours to establish, so it suits a listing shown over months rather than a viewing tomorrow. A candle must be attended and put out, which rules it out of an unoccupied property. SOSA does not make a room spray for the home; the sprays in the range are car perfumes. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. A portion of every order supports girl-child education through Nanhi Kali.
Why a high-volume agent usually ends up with two
SOSA Vaayu · the second unit ₹11,999
The case for a second machine is not coverage, it is Saturday. Three viewings in three buildings between eleven and four cannot be served by one machine without somebody driving across the city twice to collect and re-place it, and the two hours each property needs before its buyer arrives overlap in a way a single unit physically cannot solve. Two machines turn a logistics problem back into a checklist item. Buy the second one after the first has been through a full quarter and earned it, never at the same time as the first, and label them so a set of keys and a plug never go missing between listings.
A note from Sonal
I like this question because it is the only one in this group that can be answered with arithmetic rather than judgement, and the arithmetic is not close. At 240 viewings a year the machine costs less per viewing than the fuel to get to the viewing, and it is the one item on the preparation list that you still own afterwards. What I would resist is the temptation to convert that into a story about what the spend earns you. It does not earn you anything I can measure. It is simply cheap, and cheap is a good enough reason on its own when the thing is also useful.
The advice I would actually give an agent at your volume has less to do with buying and more to do with keeping. Machines at high volume are lost, not worn out. They are left behind a curtain in a flat that got handed over, they end up in a colleague's boot, the adaptor goes missing in June and the unit sits in a cupboard until December. One named person, one bag, one line on the listing sheet, and a spare adaptor. Do that and the ₹50 a viewing holds. Skip it and you will be buying a second machine for a reason that has nothing to do with Saturdays.
Everything is made and supported from Pune, and a part of every order funds girl-child education through Nanhi Kali. You get a space that smells like somewhere considered; a girl gets a classroom. That equation has always felt right to me.
Frequently asked questions
At 20 viewings a month, is a ₹11,999 scent machine worth buying?
On the arithmetic, yes. Twenty a month is 240 viewings a year, so the purchase is just under ₹50 a viewing in the first twelve months and the cost of oil after that. It compares with ₹10,000 to ₹25,000 of photography spent into a single listing. That is a cost argument, not a claim about what scent does to a sale.
How many machines do I need for 20 viewings a month?
One covers any normal apartment — up to 1000 m³, roughly 2,000 to 3,000 sq ft. The reason to own two is scheduling rather than coverage: three viewings in three buildings on a Saturday each want about two hours of lead time, and those windows overlap. Buy the second after the first has done a quarter.
How long does it take to move a machine between properties?
About two minutes each way. It is 0.9 kg and 165 × 80.5 × 215 mm, so it travels in a small bag with its adaptor. Place it in the entrance zone at waist height or above, set the timer, and collect it after. The key-lock means it can be left in a vacant flat between viewings without being tampered with.
What does it cost to run after the first year?
Oil, and not much of it. The 400ml tank is rated at about 75 days of continuous running, and a realtor runs two hours before a viewing rather than continuously, so a single fill covers a great many properties. The machine arrives with four hotel-inspired scents, which covers the first months.
Should I buy the ₹25,999 Aangan instead if I show expensive properties?
No. The Aangan covers up to 3,000 m³ and belongs in a sales gallery, a clubhouse or a very large villa. An apartment, however expensive, is a Vaayu-sized volume, and buying up because the listing is valuable is sizing a purchase to a commission rather than to a requirement.
240 viewings a year
Just under ₹50 a viewing — and it comes home with you
The Vaayu is ₹11,999: waterless cold-air nebulisation up to 1000 m³ or roughly 2,000–3,000 sq ft, a 400ml tank lasting about 75 days of continuous running, Bluetooth with 1h/4h/8h/24h timers, under 38 dB, auto-stop, a key-lock, 0.9 kg, and four hotel-inspired scents included.
Hotel Collection from ₹299, reeds from ₹749, the Sukoon at ₹1,899. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
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Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body, on the arithmetic of professional scenting for a high-volume luxury agent — 240 viewings a year, a ₹11,999 machine at just under ₹50 a viewing in the first year, and the difference between spend that is consumed by a property and equipment that is not — followed by the logistics that actually decide it: how many units, how one is moved, and what a Saturday in three buildings does to a single machine.
Facts verified August 2026: Product facts used in this guide. SOSA Vaayu ₹11,999: waterless cold-air nebulising diffuser, atomises undiluted fragrance oil to a dry residue-free nano-mist, coverage up to 1000m³ (approximately 2,000–3,000 sq ft), 400ml refillable tank lasting up to about 75 days per fill, Bluetooth app plus onboard control, 1h/4h/8h/24h timer scheduling, adjustable intensity, under 38 dB, DC 12V/1A at 5W, 165 × 80.5 × 215 mm and 0.9 kg, freestanding or wall/HVAC mounted, auto-stop and key-lock, CE, RoHS and SGS certified, supplied with four hotel-inspired fragrances. SOSA Aangan ₹25,999: HVAC-connected or standalone commercial nebulising diffuser, coverage up to 3,000m³ (roughly 8,000–10,000 sq ft), 800ml reservoir, metal body, programmable schedules, under 42 dB. Ultrasonic machines are water-based and consume 30–50 ml of water an hour: Sukoon ₹1,899 (500ml, 270–320 sq ft, 16–18 hours on low, 3–6 drops per tank, steady/2H/4H timers, three 15ml Hotel Collection scents included), Boond ₹899 (300ml), Megh ₹3,499 (6 litres). Hotel Collection water-based fragrance 15ml ₹299, 100ml ₹999, 300ml ₹1,799, Pack of 7 at 15ml ₹1,799 against ₹2,093 bought singly; the Vaayu and Aangan take their own undiluted oil rather than these water-based bottles. Reed diffusers (separate alcohol-free line) from ₹749, requiring 24–72 hours to reach their working level. Scented candles from ₹379, scenting a room in roughly 15–20 minutes but requiring attendance. Free shipping above ₹499. Timings: a nebulising diffuser reaches a working level within minutes and a stated viewing level well inside two hours. This guide makes no claim that fragrance affects a property's price, offer level or time on market; it is presentation, in the same category as photography, styling and lighting. Fragrance must never be used to conceal a material defect. SOSA is not affiliated with or endorsed by any hotel brand. Prices subject to change — see the live product pages.
A second unit · Saturdays₹11,999Shop → 
Oil · the only running cost₹1,799Shop →