Triplex: 5–7, split roughly three, two and one from the ground up.
Never: a machine on the staircase, a landing or a gallery rail. And never a Megh as a coverage upgrade.
2. Count the upper floor and take one away. Bedrooms upstairs already receive a thin layer from below. The master, behind a shut door, wants its own machine; rooms that stay open onto the landing usually want nothing.
3. Leave the stairwell empty. Staircases, landings and galleries over a double-height room are moving air or borrowed air. A machine in any of them is the commonest wasted purchase in a multi-floor home.
4. Halve the coverage in a double-height room. A 400 sq ft living room open to eighteen feet holds nearly twice the air of the same room at ten feet, so it takes two Sukoons placed at seating height — ₹3,798 — rather than one placed high.
5. Share a note between the floors. The stairwell blends whatever you run, continuously. Either use one Hotel Collection scent everywhere at different doses, or pick two that share a material — cedar, white tea or amber.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
The house has a current, and everything else follows from it
Start with the thing you cannot change. A house with an internal staircase has a continuous vertical channel through it, and warm air moves up that channel all day because the lower floors are warmer — cooking, appliances, bodies, afternoon sun. Fragrance travels with it. That single mechanism explains every oddity multi-floor owners report: the landing that smells lovely without a machine on it, the living room that never seems to hold its scent, the top-floor bedroom that smells faintly of a kitchen two storeys away. The building is not failing to hold fragrance. It is moving it, on purpose, in one direction. A flat has no equivalent, which is why advice written for flats produces such poor results in a duplex.
The second half of the picture is what does not move. Scent does not pass through a closed door and it does not fall downward in any useful quantity. So a multi-floor home is really two different problems at once: an open vertical system connecting all the circulation space, and a set of sealed rooms hanging off it. Machines belong in the sealed rooms and in the open living areas people actually sit in — never in the vertical system itself, which will neither hold what you give it nor let you control what it delivers. Get that division right and the rest of this guide is arithmetic: more machines low in the house, fewer high, nothing in the middle of the current, and a shared note so the blending that happens anyway sounds like it was intended.
The three steps, in order
SOSA Sukoon₹1,899For a duplex: count the ground-floor spaces you want scented and add one, then count the upstairs bedrooms whose doors genuinely shut and stop there. That usually lands on four Sukoons — ₹7,596 — for a 2,000 sq ft house, three for a smaller one at ₹5,697, and six at ₹11,394 for a large one with four bedrooms upstairs. For a triplex, the weighting steepens: three on the ground, two on the middle, one at the top, because rising air collects from every floor it passes and the top storey has nowhere to send it. Six machines is ₹11,394 and seven is ₹13,293.Every multi-floor home, sized
The whole cluster in one table. Areas are rough and vary hugely by city — count the rooms you want to smell of something rather than the square feet, and remember that coverage ratings assume ordinary ceiling height, a closed door and no strong draught.
| Your home | Machines | Where they go | Total |
|---|---|---|---|
| Duplex ~1,500 sq ft | 3 Sukoons | 2 in the open living-dining, 1 in the master | ₹5,697 |
| Duplex ~2,000 sq ft ★ | 4 Sukoons | 2 living-dining, 1 study or guest, 1 master | ₹7,596 |
| Duplex ~2,500 sq ft, double-height living | 5 Sukoons | 2 low in the tall room, 1 dining, 2 upstairs | ₹9,495 |
| Duplex ~3,000 sq ft, 4 bedrooms up | 6 Sukoons | 4 downstairs, 2 upstairs | ₹11,394 |
| Triplex, standard | 6 Sukoons | 3 ground, 2 middle, 1 top | ₹11,394 |
| Triplex, large | 7 Sukoons | 4 ground, 2 middle, 1 top | ₹13,293 |
| Open double-height ground floor above ~2,000 sq ft | 1 Vaayu + 2 Sukoons | Vaayu downstairs — waterless, neat oil, no Hotel Collection — Sukoons in the bedrooms | ₹15,797 |
| Never: a machine on any staircase, landing or gallery, and never a Megh as a coverage upgrade — it costs ₹3,499 and covers 215 sq ft against a Sukoon's 270–320. Buy a Megh only for a hundred hours of runtime and humidity in one dry room. For more area, the answer is always another Sukoon. | |||
Sukoon · every room₹1,899Shop → 
Hotel Collection · shared noteFrom ₹299Shop → 
Vaayu · open volume only₹11,999Shop →
Drops, placement and schedule across floors
Drops descend as you go up. Three to four per tank on the ground floor, which is replacing a constant loss; two to three on an upper floor, which is starting from a borrowed base; two at the top of a triplex, which is the end of the column. If an upper floor feels heavy, reduce the ground floor rather than the upper one — in a house with a current, the input and the complaint are almost never on the same storey. The general guidance for the Hotel Collection is three to six drops per tank, and multi-floor homes should live in the lower half of that range.
Placement repeats three rules on every floor. About a metre off the floor, on furniture rather than the ground, with clear air around the machine so mist disperses instead of condensing on a wall. Away from the stairwell — the far corner downstairs, deep inside the room upstairs. And out of the direct throw of a ceiling fan or split AC, which relocates fragrance to one wall rather than spreading it. The single exception is a double-height room, where the usual advice to go higher reverses completely: seating height, always, because everything above it is on its way out.
Schedule the floors in sequence rather than together. Ground floor first, on a two-hour timer in the late afternoon, so the stairwell has carried a soft version upward before anyone goes to bed. Upper floors an hour or so later, and bedrooms for an hour before sleep with the auto shut-off handling the end. The 16-to-18-hour tank runtime is a convenience, not an instruction — a house that is continuously topped up stops registering its own fragrance. Rinse tanks between scents, use filtered water in hard-water cities, and never put raw essential or carrier oils into an ultrasonic machine.
Every total, in one place
The complete arithmetic for two- and three-floor homes. Every Sukoon includes three 15ml Hotel Collection fragrances of your choice, so none of these tiers needs a fragrance line added at checkout.
| Setup | What you get | Covers | Total |
|---|---|---|---|
| Small duplex | 3 × Sukoon ₹1,899 · includes 9 × 15ml scents | ~1,500 sq ft over two floors | ₹5,697 |
| Standard duplex ★ | 4 × Sukoon ₹1,899 · includes 12 × 15ml scents | ~2,000 sq ft over two floors | ₹7,596 |
| Large duplex or standard triplex | 6 × Sukoon ₹1,899 · includes 18 × 15ml scents | ~3,000 sq ft, two or three floors | ₹11,394 |
| Large triplex | 7 × Sukoon ₹1,899 · includes 21 × 15ml scents | Three floors, bigger ground floor | ₹13,293 |
| Open double-height ground floor | 1 × Vaayu ₹11,999 — waterless, neat oil, cannot use the Hotel Collection — + 2 × Sukoon ₹3,798 | Up to 1000 m³ below, bedrooms above | ₹15,797 |
| Running, per year | Two 300ml bottles at ₹1,799 (~₹6/ml), or 100ml from ₹999 | Four to six machines | ₹3,598 · ~₹300 a month |
Versailles
If there is one idea I would like a multi-floor owner to take from this guide, it is that the house is doing something to your fragrance whether you plan for it or not. You are not scenting a set of rooms. You are adding something to a system that already has a current in it, and the current runs upward from the moment the ground floor warms up in the morning.
That reframing answers almost everything. It tells you why the ground floor needs more machines than its area suggests and the upper floor fewer. It tells you why a diffuser on a landing achieves nothing. It tells you why two unrelated fragrances on two floors produce a third one on the stairs, and why the top floor of a three-storey house is the hardest room in India to keep neutral. It even tells you why a double-height room wants machines low rather than high — because the top of that room is part of the current, not part of the room.
So buy against the current. Three to six Sukoons for a duplex, five to seven for a triplex, weighted down and thinning as you climb, nothing on the stairs, a shared note between the floors, and a fortnight with the ground floor running before you decide what the bedrooms need. A portion of every order supports girl-child education through Nanhi Kali — that has been true since the first bottle we sold and it is not a marketing line.
Frequently asked questions
- How many diffusers do you need for a duplex? — the count in detail.
- Scenting a staircase and double-height living room — volume rather than area.
- Duplex home scenting budget — every total, worked out.
- Sukoon vs Vaayu for a duplex — the one case for a commercial machine.
- Brand: the SOSA founder story.
SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml 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). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.