Make your home intelligent.
Save without thinking.
The thermostat that studies your rhythm and cuts bills from day one – elegant, powerful, almost invisible.
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Why your walls need Castcold
Adaptive Intelligence
Learns your schedule and the weather – adjusts before you even touch the dial.
App‑First Control
Heat any room from anywhere. Schedules, geofencing, and boost mode at your fingertips.
Open Window Detect
Senses sudden temperature drops and pauses heating – no more wasted energy.
Weekly Energy Reports
Detailed insights show exactly where you saved – and where you can improve.
Three steps to a warmer, cheaper home
Unbox & mount
Replace your old thermostat in minutes. The app guides you wire by wire.
Let it learn
The first week Castcold studies your habits, then takes over – like a silent butler.
Watch savings grow
Monthly bills drop by up to 22% while your home stays perfectly toasty.
Packed with clever tech
Smart Schedules
Set hourly plans or let Castcold build them for you.
Geofencing
Turns down the heat when everyone leaves, welcomes you back with a warm house.
Weather Adaptation
Reads local forecasts to pre‑warm or cool your home efficiently.
Savings Tracker
Real‑time dashboard shows how much CO₂ and money you’ve saved.
Stories from around the UK
“I thought smart thermostats were all hype until my bill arrived. Down 19% in the first month – I actually checked twice!” 😂
“The installation took less time than brewing a cuppa. Now the house is always warm when I get home – pure magic.” ☕
“Open window detection alone has saved me a fortune. No more heating the garden!” 🪴
Quick answers
Is my boiler compatible?
98% of UK boilers work with Castcold – combi, system, and heat‑only. The app runs an automatic check first.
Do I need a professional?
No, most users install it in under 15 minutes with our interactive guide. We can also arrange a local pro if you prefer.
Will it work with my radiator valves?
Absolutely. Add Castcold Smart Radiator Thermostats for room‑by‑room control.
How secure is my data?
End‑to‑end encryption, GDPR‑compliant servers in the EU. We never share your habits with anyone.
Let’s talk about your comfort
Leave your details and one of our experts will call back within 24 hours – no obligation, just honest advice.
