SOSA · The Founder Diaries · Bangalore Homes
Two floors,
one body of air
Most duplex advice tells you to put a machine on each level. That is right only when a door separates them, and in the majority of Bangalore duplexes no door does. What the upper floor usually needs is not a second zone device but one room device, in the bedroom, with no tank to fill.
Before you buy anything, go and look at whether there is a door at the top of your stairs. That one observation decides the whole plan.
Part of the SOSA guides for Bangalore homes. See also वायु Vaayu for a connected volume.
The answer in 30 seconds
What does a duplex need on each floor?
- Look for a door at the stair head. No door means the two floors share air and are one volume. A door means two volumes and a different plan.
- One zone device on the lower run. Entrance, living and dining measured as one, with the stair opening counted as a loss upward.₹12,499
- One room device in the master upstairs. A bedroom behind a door is a room problem, and the quietest answer is the one that plugs into the wall.₹6,999
- Prefer waterless upstairs. An ultrasonic diffuser in a bedroom means a tank to top up and clean. पवन Pawan takes undiluted oil and no water at all.
The door at the top of the stairs
A duplex is two floors joined by a staircase, and everything about scenting one turns on whether that staircase is open or enclosed. If it rises straight out of the living room with no door at either end, the two floors are a single connected body of air, and warm scented air moves continuously from the lower level to the upper landing. If there is a door — at the foot or at the head — the upper floor is a separate volume that has to be treated on its own terms.
This matters because the standard advice, one machine per floor, quietly assumes the second case. In an open-stair duplex a second zone device upstairs is largely scenting air the first one has already reached, and the usual result is a landing that is noticeably stronger than either room anyone actually sits in. What the upper floor genuinely needs is the bedroom handled, and a bedroom is a room, not a zone.
There is a second reason to be careful about what goes upstairs, and it is practical rather than physical. A good deal of duplex advice points at an ultrasonic diffuser for the upper level, because they are inexpensive and pleasant. An ultrasonic needs water topped up and a tank kept clean, and in a bedroom that is one more small daily task in the room where you are least inclined to do any. A waterless device takes undiluted oil, has no tank, and plugs into the wall.
| What to do | |
|---|---|
| Open staircase | One volume. Put the zone device on the lower run, away from the stair mouth, and handle the master bedroom as a room. Do not add a second zone device. |
| Enclosed staircase | Two volumes. The upper landing with bedrooms off it can justify its own device — measure it as a volume in its own right before deciding. |
| The lower run | वायु Vaayu, ₹12,499. published for up to 1,000 m³ of a suitable connected zone · waterless · freestanding, wall-mounted or into an HVAC return · 400 ml tank · app and timer · key-lock · under 38 dB. Measure entrance, living and dining as one. |
| The master bedroom | पवन Pawan, ₹6,999. one room up to about 500 sq ft · plugs straight into the socket · silent · app and timer · 200 ml of oil included · 1-year warranty. No water, silent, and nothing standing on a surface. |
| The landing | Usually nothing. In an open-stair duplex it is already receiving whatever rises from below. |
| Shared refills | ₹1,049 for 100 g, ₹1,849 for 300 g, for both machines. |
The three configurations, costed
One of each: ₹19,498
Zone device below, room device in the master. This is the right answer for an open-stair duplex and for most enclosed-stair ones too, because the upper floor's real requirement is usually one bedroom rather than a landing.
Two zone devices: ₹24,998
Defensible only when a door genuinely separates the floors and the upper landing is a substantial connected volume with several daily-use rooms off it. If the second machine would stand in a bedroom, it is the wrong purchase at ₹5,500 more than the device built for a bedroom.
Two room devices: ₹13,998
Tempting in a compact townhouse, and it can work if the lower floor is genuinely small and partitioned. In an open-plan lower run it will not: two room devices in one large volume give two local pockets, and the stairwell draws from both.
“Most duplex advice assumes a door that is not there. Go and look before you buy the second machine.”
Setting it up
- Go and check the stair head. A door, or no door. Everything follows from this.
- Measure the lower run in metres. Internal, ceiling height included, treated as one volume with the stair mouth as an opening.
- Place the zone device away from the stairs. If you can see the stair opening from where it stands, move it deeper into the room.
- Put the room device in the master. Not on the landing. The landing is already getting more than you think.
- Keep both in one scent family. An open staircase means the two meet continuously, and two unrelated scents read as confusion.
- Walk in from the front door to judge it. Not from the kitchen, and not after an hour indoors.
वायु and पवन · nothing to top up
A zone device below, a waterless room device above
Both machines are waterless. They break undiluted fragrance oil into a dry mist with cold air — no water tank, no heat, no damp, and nothing settling on timber treads or a stone floor.
पवन Pawan plugs straight into a bedroom socket and is silent, which is the difference that matters in a room you sleep in. one room up to about 500 sq ft · plugs straight into the socket · silent · app and timer · 200 ml of oil included · 1-year warranty.
वायु Vaayu takes the lower run. published for up to 1,000 m³ of a suitable connected zone · waterless · freestanding, wall-mounted or into an HVAC return · 400 ml tank · app and timer · key-lock · under 38 dB.
वायु Vaayu ₹12,499, ₹12,999 hotel-inspired · पवन Pawan ₹6,999 · the pairing ₹19,498
See पवन PawanSee वायु VaayuDuplex and townhouse communities around Bangalore
Provident Deansgate on IVC Road and Total Environment's The Magic Faraway Tree on Kanakapura Road are listed in townhouse and duplex formats. Duplex units also appear inside larger communities — Indraprastha Schon at Richmond Town, The Presidential Tower at Yeshwanthpur, SOBHA Insignia at Bellandur, Brigade Insignia at Yelahanka and Sattva Luxuria at Yeshwanthpur all list duplex or penthouse-duplex homes alongside simplex apartments.
Named as examples of the format, not as installations. Whether the staircase is open or enclosed differs between unit types within a single community, which is exactly the detail this page turns on — so check your own plan rather than the brochure. SOSA has no affiliation with any of them.
Questions, answered
Can one diffuser scent both floors of a duplex?
Do I need a device on each floor?
Why not an ultrasonic diffuser upstairs?
Where should the downstairs machine go?
My landing is stronger than my living room. Is something wrong?
Should both floors use the same scent?
Continue in the SOSA guides
If you would rather ask a person
Is there a door at your stair head?
Tell us that one thing, plus the lower run in metres, and we can tell you whether your duplex is one air volume or two — which is the only question that changes the answer.
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