My Client Wants the House to Smell Amazing Automatically Before They Return From Work and Before Guests Arrive - What Type of Scenting System Should I Specify?

Split the brief in two, because the honest answer is different for each half. Before your client returns from work, this is genuinely and completely achievable - it is one of the best-suited automation cases in this whole category, because the client's own daily routine already supplies a reliable clock time. The SOSA Vaayu (₹11,999) has a Bluetooth app with 1h, 4h, 8h and 24h timers and adjustable intensity; the SOSA Angaan (₹25,999) has its own programmable schedules for a villa on HVAC. Set the run to start 30 to 60 minutes before the client's typical return time, at a low, considered intensity - because a room takes 20 to 40 minutes to settle, that lead time means the fragrance is already even and quiet by the time the door opens, rather than freshly sprayed and obvious. This is a specification you can commit to fully. Before guests arrive is the honest partial no, and it deserves to be said plainly rather than glossed over: Vaayu and Angaan do not join your control system. There is no wifi, no cloud account, no Alexa or Google Home skill, and no Control4, Crestron, Lutron, KNX, Matter, Zigbee or Z-Wave integration - naming those systems here is only to be precise about what is not present, never to claim compatibility with any of them. What they do have is a repeating clock-based schedule, set once on the machine's own Bluetooth app or its onboard programming, that runs every day with nobody touching a switch. There is no calendar link, no doorbell sensor, no way for the machine to know a guest is on the way, so a schedule cannot be timed to an event that has no fixed clock time. But the underlying want - a house that always smells right when someone visits - is still achievable, just by a different mechanism: a low, continuous baseline run through the hours guests typically visit, say from early evening through to a reasonable closing hour, rather than a precisely timed spike. There is a reason a scene-triggered burst would be the wrong model even if SOSA's machines could take a trigger. Lighting changes in milliseconds and blinds move in seconds, but a room's air takes roughly twenty to forty minutes to reach an even, settled fragrance level, and just as long to clear - a "welcome home" button that fires fragrance the moment a door opens is physically too late, and if the level is set high enough to register in that first moment, it is already too strong by the tenth minute, because a fresh nose notices a change and then stops registering it within a few minutes while the room keeps accumulating. The arrival effect people actually want is produced by a fresh nose walking into a room that has already been held at a low, settled level for the last hour - which is exactly what a schedule does and a trigger cannot. That principle answers this brief directly: a low baseline that has been running for hours by the time any guest actually arrives produces a more reliable result than any trigger could, because it does not depend on guessing the exact minute correctly. So the specification for both halves of this brief turns out to be one machine, run two ways - a precise pre-arrival schedule for the work-return case, and a longer, lower baseline for the guest case - rather than two different pieces of hardware. For an apartment or a single zone, one SOSA Vaayu does both jobs; for a villa already on central HVAC, one SOSA Angaan does. Ask for a home scenting plan and tell us the client's routine and how often they entertain, and we will set both schedules on the same machine.