It switches off the AC nobody is using and proves what it saved, puts every AC on your phone, guards the empty apartment when you arm it and warns you before mould takes hold. Plug it in, pick your AC, done.
USB-C powered, 95 × 95 × 28 mm, silent and unobtrusive. It sits on a shelf or the wall and guests never give it a second look.
| Presence sensor | 24 GHz radar — no camera, no microphone |
| Climate sensor | Temperature ±0.1 °C, humidity ±1 % |
| IR control | 200+ AC models built in, or learn any remote |
| Connectivity | Wi-Fi 6 (2.4 GHz) |
| Power | USB-C (cable included) |
| Certification | CE (RED, EMC, safety), before it ships |
Each one made for how a short-term rental is actually used, not a smart-home feature with a new label.
When the apartment is confirmed empty, Cerloq eases the AC back to an economy setting, then switches it off. When it saves, it only ever turns the AC down or off, never on: comfort stays with the guest’s remote. Quiet hours you set are never touched.
A 24 GHz radar senses a person even when they are asleep: the case every motion sensor misses. There is no camera and no microphone, and what happens in the room stays in the device.
Five one-tap commands (off, cool, cool max, heat, heat max) for any AC in the library, or the buttons you teach it from its own remote. Guest landing late? One tap pre-cools the apartment from the airport.
Cerloq logs the AC hours it actually avoided (the AC was running, the room was empty, it switched it off) by day, month and year. Your tariff and the AC’s capacity turn them into kWh and euros.
Arm it from the app when the apartment should be empty. If someone is inside while it is armed, you usually get an alert on your phone within a minute. Disarmed during stays, so a paying guest never trips it. An add-on, not a certified alarm system.
Humidity and temperature are tracked while the apartment is empty, and you are warned before conditions turn into mould. Switch on the climate guard and, when the apartment has been empty for a day and the air stays damp, Cerloq runs the AC on eco until humidity is back to normal, then switches it off, handing over the moment anyone walks in.
On a warm day with the apartment empty, one tap runs a 75-minute test: Cerloq measures how fast the AC cools, compares it with its own first result and tells you when it needs a service, before it gives up on a fully booked weekend in August.
Next on the roadmap: cleaning-visit verification for connected calendars, and a relay for your existing smoke alarm.
€99 for the device, the core features free forever, nothing to pay until it ships. 30-day money-back guarantee, 2-year warranty.