A thermostat that won’t go above 70 (or any other specific number) almost always has an active maximum-setpoint limit, either one you or a previous occupant set, or one an installer configured. It’s a configuration setting, not a hardware fault.
Check for an active temperature limiter
Most smart and programmable thermostats let you cap the highest (and lowest) setpoint a user can select, a feature aimed at rentals, offices, and multi-occupant homes where someone wants to prevent the temperature from being pushed to an extreme. If that cap is set to 70, the thermostat will refuse to go higher no matter how you adjust it, and it won’t necessarily show an error explaining why.
Where to find this setting, by brand
- ecobee: Main Menu > Settings > Reminders & Alerts > (or Installation Settings, depending on firmware) > Temperature Range Limits.
- Honeywell Home: Installer Setup Utility, a menu accessed through a hold-combo intended for installers rather than the everyday user menu; the exact combo varies by model.
- Nest: Settings > Temperature limits, in the Nest app.
If you don’t have installer-level access and the limit was set by a property manager or a previous owner, that’s worth confirming with them before assuming it’s a thermostat malfunction.
If there’s no limiter active
Rule out these before assuming the limiter is the cause:
- Check the actual mode. A thermostat in Cool mode won’t call for heat no matter what setpoint you enter; confirm it’s set to Heat if you’re trying to warm the space above 70.
- Check for a scheduled hold. A programmed schedule can override a manual setpoint change at the next scheduled period, making it look like the thermostat “reset” itself back down.
- Check the equipment itself. If the setpoint accepts higher numbers but the space never actually reaches them, that’s a heating-capacity problem, not a thermostat setting; see the equivalent AC-side diagnosis for the same kind of airflow and equipment checks.
| Symptom | Likely cause | Fix |
|---|---|---|
| Setpoint dial/buttons stop responding at a fixed number | Active max-temperature limiter | Find and adjust the limiter in installer/settings menu |
| Setpoint accepts higher numbers, room never gets there | Equipment/airflow issue, not a setting | Diagnose the equipment, not the thermostat |
| Setpoint keeps reverting to 70 after you raise it | Scheduled hold overriding your manual change | Check schedule, switch to permanent hold if needed |
Why this setting exists at all
Temperature range limits aren’t a hidden restriction meant to frustrate anyone; they’re a legitimate energy-management and liability tool. Property managers use them in rentals and short-term rentals to prevent a guest from running heating or cooling at an extreme setpoint that spikes the utility bill or stresses older equipment. Offices and shared spaces use them to keep a building’s HVAC load predictable across many thermostats rather than letting each occupant push it to an extreme. If you’ve moved into a home or unit you didn’t set up yourself, an inherited limiter is common, not a malfunction.
Frequently Asked Questions
Why would a temperature limiter even be set on a home thermostat? Often left over from a rental, dorm, or short-term-rental configuration, or set by an installer at a property manager’s request. It’s not a default behavior on most thermostats.
Can I remove the limiter myself? Usually yes, through the installer or settings menu, though some models restrict this to an installer PIN. Check your model’s manual for the exact menu path.
My thermostat is in Heat mode and still won’t go above 70. What else could it be? Confirm there isn’t a separate scheduled hold overriding your setpoint change, and check whether the setpoint number itself is accepting the change (some models show a brief error or won’t let the number climb past the limit at all, which confirms a limiter rather than an equipment issue).
This guide covers residential smart and programmable thermostats generally; for terminal-level wiring questions on a specific brand, see our Honeywell or Braeburn manual guides.
