Heat pumps are increasingly common, especially as more homes electrify heating, and they come with a few characteristics that make smart thermostat compatibility worth double-checking rather than assuming.
Why heat pumps are different
A heat pump moves heat rather than generating it, which means it often runs longer at lower output rather than in short, high-output bursts like a furnace. Many heat pump systems also include auxiliary or “emergency” heat strips for when outdoor temperatures drop too low for the heat pump alone to keep up — and a thermostat needs to manage that transition correctly, or it can end up relying on the far more expensive auxiliary heat more than necessary.
What to look for in a heat-pump-compatible thermostat
Look specifically for a thermostat that lists heat pump support (not just “furnace and AC”) and, ideally, auxiliary/emergency heat management as a named feature — this is where models differ the most. Ecobee’s lineup has historically been strong here, with dedicated heat pump and aux-heat handling; Google Nest and others also support heat pumps but it’s worth confirming the specific model and whether dual-fuel (furnace + heat pump) setups are included, since that’s an extra layer some thermostats don’t fully support.
The setup step people skip
During installation, most heat-pump-aware thermostats will explicitly ask whether your system is a heat pump and how many stages of heat and aux heat it has — answering this correctly matters more for a heat pump than for a standard furnace, since getting it wrong can mean the aux heat runs far more (and costs far more) than it should. If in doubt, check your outdoor unit’s nameplate or ask your HVAC installer for the system type before setup.