A smart thermostat can make a heat pump more efficient, but only if you use it the way a heat pump wants to be used, which is different from how you’d run an old furnace.
The short version: heat pumps work best holding a steady temperature, not swinging up and down with big setbacks. That one habit matters more than which brand of thermostat you buy. Get the setpoints right, pick a compatible controller, and let the system do what it’s designed to do.
Why heat pumps prefer steady setpoints
If you grew up with a gas furnace, the standard advice was simple: turn the heat way down when you leave or go to bed, then crank it back up. A furnace recovers fast, so a deep setback saved fuel.
A heat pump is a different machine. It heats gently and continuously, moving heat rather than burning it, and it’s most efficient when it runs long, low, and steady. Ask it to jump 4 or 5 degrees in a hurry after a big overnight setback, and one of two things happens:
The heat pump strains at maximum output for a long stretch, which is its least efficient mode.
On a cold Fraser Valley morning, the thermostat calls for backup electric heat (or, in a dual-fuel setup, fires the furnace) to catch up fast. Backup heat costs far more to run than the heat pump itself.
Either way, the savings from the setback get eaten by an expensive recovery. For most heat pump homes, a steady setpoint, or a very small setback of 1 to 2 degrees, is the efficient choice. This is one of the biggest differences between running a heat pump and running the gas furnace it often replaces.
Compatible smart thermostats
Not every smart thermostat plays well with a heat pump. The important thing is that the thermostat understands heat pump control, especially auxiliary or backup heat staging. A thermostat that treats your backup heat like normal heat will run it too often and drive up your bill.
Solid, widely compatible options include:
Ecobee - strong heat pump and multi-stage support, with a threshold for when to allow backup heat.
Google Nest - good heat pump handling, including its “heat pump balance” feature that limits how aggressively backup heat kicks in.
Honeywell Home (T-series) - reliable multi-stage and dual-fuel control, common on ducted systems.
The manufacturer’s own controller - many cold-climate inverter heat pumps ship with a proprietary control designed for that unit. Sometimes this is the best choice, because it speaks the system’s own language.
For a ductless mini-split, the “thermostat” is often the unit’s own controller plus an app rather than a wall thermostat. That’s normal and works well. Our guide on ducted vs. ductless heat pumps covers how controls differ between them.
The right match depends on your equipment, so we confirm thermostat compatibility as part of the install. It’s a detail that’s easy to get wrong.
Scheduling that works with a heat pump
You can still use schedules. You just design them differently than you would for a furnace.
Keep the swings small. A 1 to 2 degree overnight or away setback is plenty. Deep 5-degree setbacks usually cost more than they save on a heat pump.
Recover gently. If you do lower the temperature at night, schedule the morning warm-up to start earlier and climb slowly, so the heat pump can do the work without calling for backup heat.
Use “eco” or “comfort” ranges, not hard swings. Many smart thermostats let you set a comfort band rather than a single number. A tight band suits a heat pump well.
Set it and mostly leave it. In practice, a lot of heat pump owners land on one comfortable setpoint and let the inverter modulate around it. That’s not laziness, it’s efficiency.
Dual-fuel switchover control
If you have a dual-fuel system - a heat pump paired with a gas furnace - the smart thermostat does one especially important job: it decides when to switch from the heat pump to the furnace.
This is the switchover temperature (sometimes called the balance point). Above it, the efficient heat pump handles the heating. Below it, when a cold snap makes the furnace the cheaper or faster option, the thermostat hands off to gas.
A smart thermostat set up correctly for dual-fuel will:
Run the heat pump for the mild, above-freezing weather that makes up most of a Fraser Valley heating season.
Lock out the furnace until the outdoor temperature actually justifies it.
Switch over automatically, so you never have to think about it.
Set the switchover point wrong and you either run expensive gas heat too early or push the heat pump past its efficient range. We cover how these systems work in our guide to dual-fuel heating, and we set the switchover during commissioning based on your equipment and local climate.
Energy savings and geofencing
Used well, a smart thermostat helps a heat pump in a few concrete ways:
It prevents expensive backup heat. Features like Nest’s heat pump balance and Ecobee’s aux heat threshold keep the costly electric or gas backup from running when it isn’t needed. This is where the real savings live.
It reports on itself. Monthly energy reports and runtime data show you what the system is doing, so you can spot a problem early.
Geofencing. Most smart thermostats can use your phone’s location to know when the house is empty. Keep the “away” setback modest, a couple of degrees, so the system isn’t fighting a huge recovery when you get home. Geofencing works well here because it makes small, frequent adjustments rather than one deep daily swing.
A heat pump already cuts heating costs by 30 to 50% versus baseboards or oil. A well-configured thermostat protects those savings by keeping the backup heat off. A poorly configured one can quietly erase a chunk of them.
The install matters more than the thermostat
A smart thermostat is a tuning tool, not a fix for a poorly matched system. The savings really come from a correctly sized heat pump, a clean install, and controls set up properly at commissioning. That’s why every Cohesive job starts with a free Home Energy Assessment - load calc, panel check, and sizing - and ends with the controls configured and explained before we leave. You can read more on our heat pump installations page.
Done right, you set a comfortable temperature and mostly forget about it. That’s the goal.
FAQ
Should I turn my heat pump down at night?
Only a little. A small 1 to 2 degree setback is fine, but deep setbacks usually cost more than they save because the heat pump has to strain or call for backup heat to recover. For most heat pump homes, holding a steady temperature is the efficient choice.
Do I need a special thermostat for a heat pump?
You need one that understands heat pump control, including backup or auxiliary heat staging. Ecobee, Google Nest, and Honeywell Home models all support this, as do most manufacturer-supplied controllers. A generic furnace thermostat can mismanage the backup heat and raise your bills.
What is a switchover temperature in a dual-fuel system?
It’s the outdoor temperature at which control hands off from the heat pump to the gas furnace. Above it, the efficient heat pump heats the home; below it, the furnace takes over. Setting this point correctly is one of the most important parts of a dual-fuel setup.
Does geofencing actually save money on a heat pump?
It can, if you keep the away setback small. Geofencing lets the thermostat ease the temperature down when the house is empty and bring it back gently as you return, which suits a heat pump better than one large daily swing. Big geofenced setbacks can trigger expensive recovery, so keep them modest.
Can I use a smart thermostat with a ductless mini-split?
Yes, though it often works differently. Many ductless systems use the unit’s own controller and app rather than a wall thermostat, and some support third-party smart controls. We confirm what your specific equipment supports during the install.
Will a smart thermostat lower my heat pump bills on its own?
It helps, but it isn’t magic. The biggest savings come from a correctly sized system and a clean install. A well-configured thermostat protects those savings by keeping backup heat off, while a poorly configured one can erase them.
Cohesive Mechanical is the Fraser Valley’s trusted HVAC and plumbing experts - based in Chilliwack, serving Abbotsford, Langley, and the Lower Mainland since 2017. HPSC-registered. ENERGY STAR® certified equipment. Clean installs. Clear communication.
Book a free quote and we’ll set your heat pump and thermostat up to run efficiently from day one. Learn more about our heat pump installations.
Related: Dual-Fuel Heating: Pairing a Heat Pump With Your Furnace · 7 Real Benefits of a Heat Pump for Fraser Valley Homeowners
