How reptile thermostats work,
and how they fail.
Written from the bench rather than from a product page. Each one answers a question keepers actually ask, and the advice applies whatever brand sits on your rack.
Why a thermostat fails with the heater stuck on
Relay fusion welds the contacts shut, the heater never switches off, and the controller carries on reporting a setpoint it is no longer enforcing. The mechanism, a one-minute test for your own unit, and what actually protects against it.
Read the guide →Where to put your probe (and why it beats accuracy)
A lab-grade sensor in the wrong place is less useful than a cheap one in the right place. Placement for belly heat, basking zones and ambient control — plus the offset that makes a correctly configured basking spot run cool.
Read the guide →What happens when a temperature probe fails
A dead probe can leave the enclosure cold, cooked, or correctly managed, and the firmware decides which. How probes fail, how to recognise a reading that means “broken” rather than “cold”, and what good fallback looks like.
Read the guide →Pulse, dimming or on/off: which control type?
Three control types and one rule for choosing between them — plus the combination that will flicker a basking bulb and shorten its life.
Read the guide →How many zones does your setup actually need?
“How many enclosures can one thermostat run?” is the wrong question. Count independently controlled outputs instead, and the answer stops being guesswork.
Read the guide →What happens when the internet goes down
Some smart thermostats keep regulating perfectly with the router unplugged. Others stop controlling entirely. The difference is architectural, and you can test yours in five minutes.
Read the guide →Alerts: finding out before your animal does
Every protective layer is worth more if something tells you it fired. What should trigger an alert, how alerts should reach you, and why retry logic matters more than the channel.
Read the guide →Built around the failures described here
Five independent climate zones, pulse-proportional heating, and hardware failsafes that work with the power and the internet down.