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Built for short-term rentals

Your guests checked out. Your AC didn’t.

Cerloq One notices when the apartment is empty, switches the AC off and records every hour it saved. Every AC on your phone. Alerts only when they matter. Five minutes to install, and it can pay for itself in one summer.

Reserve yours — €99 Watch a day with Cerloq

Or try the app itself, no sign-up →

Pay nothing until it ships 30-day money-back guarantee Ships across the EU 2-year warranty

Works with 200+ air-conditioner models from 39 brands — or teach it the buttons from any remote

Daikin Mitsubishi LG Samsung Panasonic Gree
What it does for you

Saves while it’s empty. Guards while you’re away. Answers to your phone.

One small device, three jobs every rental needs. No calendar to connect, no camera, no subscription to get started.

Cut the AC bill by 17–30 %

Guests leave. The AC follows. Once the apartment is confirmed empty, Cerloq eases the AC back, then switches it off, and logs every hour it saved. Measured, not guessed.

Why it saves →

Empty should mean empty.

Arm it between stays and get an alert on your phone within a minute if anyone walks in. It watches the humidity too, and warns you before mould takes hold.

Protection features →

Any AC, from anywhere

Off, cool or heat in one tap, wherever you are. Pre-cool before a late check-in, switch off after checkout, check the room’s temperature from the beach.

How it works →
Why hosts choose Cerloq

Made for rentals. Not for smart homes.

Most devices watch and report. Cerloq acts. You see it on the electricity bill, and in how well you sleep when the apartment is empty.

17–30 % lower AC bill

Savings you can check, hour by hour.

An empty room stops burning AC hours. Independent studies put the saving at 17–30 % of the AC bill: up to €100 a month per unit in a Mediterranean summer.

  • Runs on what happens in the room: no calendar, nothing to connect
  • Every saved hour on record, so you can check it
  • Can pay for itself in a single season
Why it saves →
AVOIDED AC RUNTIME · THIS MONTH 62 h ≈ €84 estimated from your tariff M A M J J A S
4 devices → 1

One device instead of four.

A smart AC controller, a presence sensor, an anti-theft sensor and a humidity monitor. Cerloq One does all four for the price of one, and adds what none of them can: proof of what it saved, and any AC on your phone from anywhere.

  • Five-minute setup per unit
  • Silent and discreet: guests won’t give it a second look
  • No camera, no microphone, no live feed of your guests
See the full feature list →
4 DEVICES · TYPICAL PRICES 1 DEVICE AC controller €199 Presence sensor €79 Antitheft €129 Humidity monitor €79 CERLOQ ONE €99 · ALL OF IT SUPERPOWERS ✓ Occupancy-driven savings ✓ Any AC, remote from anywhere + ALSO INSIDE ✓ AC control ✓ Presence sensing ✓ Antitheft ✓ Mould-risk alerts
How it works

Installed in five minutes. Saving from day one.

No electrician, no calendar integration, no account for your cleaner. Anyone who can plug in a phone charger can install Cerloq One.

1

Plug in the device

USB-C into any wall socket. Scan the code on the unit with the Cerloq app and connect it to the Wi-Fi — a couple of minutes, no electrician.

~2 min
2

Pick your AC

Choose it from the built-in library of 200+ models across 39 brands and it is ready in seconds. Not listed? Teach Cerloq the buttons from the AC’s own remote.

~1 min
3

Set your house rules

Choose quiet hours the device never acts in, and how it should treat an empty room: eco then off, off only, or hands off. Step out once for a one-minute calibration and the savings start with the next checkout.

~1 min
17–30%
less AC energy when the AC follows the room, in independent studies
€80–250
saved per unit per year in a Mediterranean rental: the device can pay for itself in its first season
~20 min
from the door closing to the AC switched off. Someone still inside, even asleep? It waits.
~50%
of booked hours in hotel rooms have the AC running with nobody inside (SensorFlow, 64,000 room-nights)

Savings figures come from published studies; yours depend on climate, how the apartment is used and the AC itself. See the evidence.

Who it’s for

One device. Priced for the way you work.

From a single apartment to a managed portfolio.

€80–250 / unit / yr

You handle the bookings — Cerloq handles the bill.

The AC bill drops 17–30 % without you lifting a finger. Intrusion alerts only watch when you arm them. One tap pre-cools the apartment before a late arrival.

  • Free Starter plan, forever
  • Every saved AC hour logged
  • Any AC on your phone, from anywhere
  • Replaces a smart AC controller — and proves what it saved
See pricing
YOUR APARTMENT · ATHENS 62 h avoided AC runtime · ≈ €84 estimated 71 % of summer budget recovered Hardware paid back in: 28 days
What hosts told us

Built from fifty conversations with hosts.

Before building anything we interviewed 50 short-term-rental operators, ten of them managing more than ten units. The quotes below are composites of what we heard — not customer testimonials; those come once the first units are in the field.

"

We run apartments in Athens with a smart AC controller on every wall — and still no idea what it actually saves. One device per unit that switches off abandoned AC and proves it, hour by hour, would save my support team hours every week.

A
Property manager — Athens
24 units · interviewed Q1 2026
Pricing

€99 for the device. The core features are free, forever.

Starter covers the automation, the remote and intrusion alerts. Pro adds the savings in euros and the protection extras; Property Manager adds the portfolio tools. Cancel anytime: the hardware stays yours.

Starter
Free / month

AC automation, remote control, intrusion alerts and the saved-hours log. Free forever.

Pro
€49 / year per apartment

Everything in Starter, plus savings in euros, mould protection, the AC health check and 12-month history. Less than €1 a week.

Property Manager
€4 / unit / month, billed yearly · 10+

Everything in Pro, plus the portfolio dashboard, Excel export and volume hardware pricing.

See full pricing + ROI calculator →

Reserve yours before the first heatwave.

€99 for the device, nothing to pay until it ships, 30-day money-back guarantee, 2-year warranty. Ships across the EU.

View pricing Reserve now