Each unit: 90–120cm up, hard surface, central to its own volume, on the line the air already takes.
The rule that decides it: the third machine goes in the room that is used, not the room that is biggest — and never as a second unit in one open living-dining.
2. The third goes in the room that is used, not the room that is biggest. A 110–140 sq ft second bedroom and a 100–130 sq ft third bedroom are both comfortably inside the rating, so size decides nothing here. Conscious hours decide everything — a study, a child's room or a home office beats a larger room with nobody in it.
3. Never two machines in one open plan. If your living-dining is large, the temptation is to give it two of the three. Two units in one volume overlap in the middle and add almost nothing at the ends, and it leaves a whole bedroom silent to achieve it.
4. Each unit at 90–120cm, on something hard, on the flat's airflow line. Cool mist descends as it disperses, so height matters more than any setting. Do the exercise three times, separately, because the machines are not cooperating — each is solving its own room.
5. Three different fragrances, one per tank. Nine 15ml Hotel Collection bottles arrive with three machines, so the sequence costs nothing: clean where the front door opens, warm behind the master bedroom door, deliberately neutral where somebody else sleeps.
A portion of every order supports girl-child education through Nanhi Kali.
The triangle, and the rules each machine obeys
At one machine, placement is a single decision. At three it becomes a shape, because the useful question stops being where this unit goes and becomes whether the flat changes as you walk through it. Three Sukoons at ₹5,697 should be spread as widely as your doors allow — front of the flat, master bedroom, and the far end of the corridor — so that every threshold you cross does something. Underneath that shape, each machine still obeys the same three rules on its own.
Where each of the three goes, room by room
The three positions, the two rooms that still get nothing, and the reasoning for each. Read the last column rather than copying the middle one, because the reasons travel between flats and the furniture does not.
| Room | Typical size | Where it goes | Setting and reason |
|---|---|---|---|
| Living / dining ★ | 350–500 sq ft | Console or sideboard 90–120cm up, central to the volume, on the front-door-to-balcony line | Steady or 4H. The largest air mass in the flat and the only one at the top of a single machine's rating |
| Master bedroom | 140–180 sq ft | Chest of drawers across the room from the pillow, at least 1.5m away | Low with the 2H timer — the room is well inside the rating, so the skill is restraint |
| The second room somebody uses | 110–140 sq ft | Same rule again: away from the bed, at waist height or above, near the room's own airflow line | Low with the 2H timer. Conscious hours earn this machine, not floor area |
| A home office, if you have one | 100–140 sq ft | Across the desk rather than beside the screen, 90–120cm up | Eight working hours behind a closed door is the strongest claim on the third machine in the flat |
| The remaining bedroom | 100–130 sq ft | No machine — a reed diffuser from ₹749 or a candle from ₹379 | A fourth Sukoon here is ₹1,899 running to an empty bed in most households |
| Corridor, kitchen, bathrooms | Passages and air pockets | Nothing; extractor first in the kitchen; a Boond at ₹899 in a bathroom | The corridor borrows from all three machines already, which is the reward for spreading them out |
Sukoon · one per room₹1,899Shop → 
Hotel Collection · 7 scentsfrom ₹299Shop → 300ml refill · the running cost₹1,799Shop →
Why the third machine follows the household, not the floor plan
Two of the three positions are settled before you start. The living/dining takes the first machine because it is the largest volume, the room the front door opens into and the room holding most of your waking hours; the master bedroom takes the second because that is where a fragrance you chose does its most private work. The third is a genuine decision, and the mistake people make is to resolve it with a tape measure. A 110–140 sq ft second bedroom and a 100–130 sq ft third bedroom both sit comfortably inside a 270–320 sq ft rating, so neither room is straining the machine and size tells you nothing at all. What tells you everything is who is conscious in there and for how long. A 105 sq ft room where a child does homework every evening earns the machine ahead of a 135 sq ft room that holds a spare mattress and a suitcase, and it is not close.
The strongest claim of all in a modern Indian 3BHK is the home office. Somebody sitting behind a closed door for eight hours experiences more of that fragrance than the master bedroom gets in a week, because most bedroom hours are spent asleep. If one of your bedrooms has quietly become a study, put the third machine there without hesitating, run it on low with the 4H timer through the working day, and choose something dry and unsweet for it — the 1 Hotels-inspired, cedarwood, vetiver and green leaves, wears across a working day better than anything richer. Second strongest is a room where a second couple or a parent sleeps, because that is a person who deserves their own threshold rather than an extension of yours. Weakest, always, is the guest room used three or four times a year, and I would rather you spent that ₹1,899 on a 300ml 300ml refill for the tanks you fill every week than on a machine that evaporates slowly into an empty room.
One more thing worth settling while you are placing them: run three different fragrances rather than one. Three tanks on the same bottle is coverage without contrast, and it quietly wastes the reason you bought three machines — the change at each threshold is the effect. Nine 15ml Hotel Collection bottles arrive with the three units at ₹5,697, so this is a checkout decision rather than a purchase: Ritz-Carlton-inspired where the front door opens, St. Regis-inspired behind the master bedroom door, Westin-inspired where somebody else sleeps. Keep the machines at least a room apart, which the triangle already does for you, and resist the urge to run all three on high at once — three units at 30–50 ml/h in a flat with the internal doors open is the one way a considered home starts to smell like a lobby. Low settings and timers, three different characters, and the corridor between them doing the blending on your behalf.
The SOSA 3BHK edit
The three-machine setup as a shopping list, on the assumption the placement above is done. Everything below the first line is fragrance rather than hardware, which is the correct direction in a home this size.
| Buy | What it does | When it earns its place | Price |
|---|---|---|---|
| 1. Three Sukoons ★ | Living/dining, master bedroom and the room somebody is awake in — 270–320 sq ft each, nine 15ml scents between them | The answer for a standard 3BHK. Two at ₹3,798 is the honest place to start | ₹5,697 |
| 2. 300ml refill | Your everyday scent across all three tanks at about ₹6 per ml | After a month, once one of the nine included bottles has won | ₹1,799 |
| 3. Pack of 7 × 15ml | Every scent in the range — 105ml at about ₹17 per ml — for a summer trio and a winter one | If the three rooms have started smelling like one another | ₹1,799 |
| 4. Reed diffuser | The remaining bedroom, quietly — a corner rather than a room, and no socket | Instead of a fourth machine in a room nobody sleeps in | from ₹749 |
| 5. Vaayu | Waterless, up to 1000m³, app and timer — for a genuinely open 350–500 sq ft living-dining | Only if placement has failed and the open volume still thins out at the ends | ₹11,999 |
| Not this: two machines in one room | A second Sukoon at the far end of the same open plan | Never. Two units in one air mass overlap rather than add | ₹1,899 |
Versailles
When somebody sends me their floor plan with three machines marked on it, the correction I make is almost always the same one: they have drawn a line rather than a triangle. Two units in the living-dining and one in the master, or all three within fifteen feet of the front door because that is where the furniture is. The flat then has one very confident half and one silent half, and a corridor that gives up somewhere in the middle.
Spread them to the corners of the plan and let the corridor do the blending. Then let the third one follow your household rather than the drawing — the room where somebody works, studies or sleeps every day, even if it is the smaller of the two remaining bedrooms. I would rather sell you three machines in three used rooms than four in four rooms, and I would rather you moved a unit a metre than bought another one. The one place I will not compromise is two machines in a single open living-dining. If that room genuinely defeats one Sukoon after you have raised it and centred it, it is asking for a different technology, not another of the same.
Everything is made and supported from Pune, and a part of every order funds girl-child education through Nanhi Kali. You get a home that smells like somewhere you chose; a girl gets a classroom. That equation has always felt right to me.
Frequently asked questions
- Where should you place two Sukoons in a 3BHK? — the placement mechanics for a pair.
- Should you buy three ultrasonic diffusers for a 3BHK? — the case for three, and where four stops.
- Best Hotel Collection fragrance combination for a 3BHK — which scent in which room.
- The complete SOSA Sukoon buying guide for a 3BHK — the pillar guide.
- Brand: the SOSA founder story.
Facts verified August 2026: SOSA Sukoon — 500ml tank, 2.4MHz ultrasonic cool mist, 270–320 sq ft coverage, 16–18 hours runtime on low and 9–12 on high, 30–50 ml/h mist output, 7-colour LED, remote and steady/2H/4H timers, BPA-free ABS with auto shut-off and overheat protection, ~17cm high — ₹1,899, including three 15ml Hotel Collection fragrances of your choice. Boond 300ml ₹899; Megh 6-litre ₹3,499. Hotel Collection water-based fragrance 15ml ₹299, 100ml ₹999, 300ml ₹1,799, Pack of 7 × 15ml ₹1,799; 100ml and 300ml refills from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea, bergamot, cedar), Westin-inspired (white tea, aloe, cedar), 1 Hotels-inspired (cedarwood, vetiver, green leaves), The St. Regis-inspired (amber, violet, woods), Shangri-La-inspired (jasmine, green tea, white tea), Four Seasons-inspired (citrus, floral, sandalwood), W Hotels-inspired (citrus, pepper, amber). Waterless systems for larger and connected spaces: Vaayu ₹11,999 (up to 1000m³), Aangan ₹25,999 (8,000–10,000 sq ft), Meenar ₹38,500 (12,000–18,000 sq ft). The Hotel Collection scents are SOSA's own interpretations; SOSA is not affiliated with or endorsed by any hotel brand. Prices subject to change — see the live product pages.