Yes, a smart thermostat can save money, but usually a modest amount, and only if it changes how your heating and cooling actually run. Most of the savings come from automatically turning the temperature down when you are asleep or away, something a programmable thermostat can do too if you set it up and leave it alone. For many Canadian homes, a smart thermostat pays for itself in a few heating seasons; for others, especially homes with the wrong type of heating, it may never.
Key takeaways
- Savings come mainly from scheduled setbacks and away detection; ENERGY STAR estimates certified smart thermostats save roughly 8% on heating and cooling for an average household.
- Your savings depend on your heating fuel, how much you already adjust the temperature, and how much you spend on heating to begin with.
- Heat pump owners should use gentle setbacks and choose a thermostat that manages backup heat properly.
- Electric baseboard homes need line-voltage smart thermostats, not the common low-voltage models.
- Utility and provincial rebates for smart thermostats are common; check what is available at your address.
Where the savings come from
A thermostat does not make your furnace or heat pump more efficient. It only decides when the system runs and to what temperature. Smart thermostats save energy in a few ways:
- Schedules and setbacks. Lowering the temperature a few degrees overnight and while the house is empty reduces heat loss, because a cooler house loses heat to the outdoors more slowly.
- Occupancy sensing and geofencing. The thermostat notices when no one is home, using motion sensors or your phone's location, and adjusts automatically.
- Learning and optimization. Some models learn how long your home takes to warm up so they start heating just in time.
- Usage reports. Monthly summaries help you spot habits that drive up costs.
- Demand response. Some utilities offer programs that briefly adjust participating thermostats during peak demand, sometimes with a bill credit.
If you already turn the heat down every night and before work without fail, a smart thermostat will add little. If your thermostat sits at 22°C around the clock, the gains can be meaningful.
How much can you realistically save?
Savings are a percentage of your heating and cooling costs, so the dollar figure depends on how much you spend. The table below gives rough, illustrative ranges assuming savings of about 5% to 10%, which is in line with typical published estimates.
| Annual heating and cooling cost | Possible savings at 5% | Possible savings at 10% |
|---|---|---|
| $1,000 | $50 | $100 |
| $2,000 | $100 | $200 |
| $3,500 | $175 | $350 |
A smart thermostat typically costs roughly $100 to $350, plus installation if you do not do it yourself. Rebates can cut that significantly. In a home with high heating bills, the payback can be two to four years; in an efficient home with low bills, it can stretch much longer.
Heat pumps: set it and (mostly) forget it
Heat pumps behave differently from furnaces. A furnace can blast heat to recover from a deep setback quickly. A heat pump works most efficiently running steadily at lower output, and on a cold morning a big recovery can trigger expensive electric backup heat.
If you have a heat pump:
- Use small setbacks of 1–2°C rather than 4–5°C.
- Choose a thermostat that is heat-pump compatible and lets you control when auxiliary or backup heat engages.
- For dual-fuel systems (heat pump plus gas furnace), look for a setting that switches to the furnace based on outdoor temperature.
- Ductless mini-splits are usually controlled by their own remote or Wi-Fi module rather than a wall thermostat.
Our heat pump and geothermal page explains how heat pumps work in Canadian winters.
Baseboards, radiant floors and other systems
Most smart thermostats are designed for low-voltage (24 V) systems: furnaces, boilers with a control box, and central heat pumps. Electric baseboard heaters run on line voltage (120 V or 240 V), so they need a line-voltage smart thermostat, usually one per room. Installing these involves household electrical wiring, so hire a licensed electrician if you are not qualified.
Room-by-room control can actually be an advantage. Baseboard homes can heat bedrooms and living areas on separate schedules, which is where a lot of the savings come from.
Radiant floors respond slowly, so aggressive setbacks rarely help. A steady temperature with a modest overnight drop is the norm.
Choosing a smart thermostat
Before you buy, check:
- Compatibility. Look at the wires behind your current thermostat and use the manufacturer's compatibility checker. Many models need a "C" (common) wire for continuous power.
- ENERGY STAR certification. Certified models have shown savings in real-world data.
- Remote sensors. Useful in homes with hot and cold rooms, so the thermostat responds to where people actually are.
- Privacy settings. Smart thermostats collect occupancy data. Review what is shared and opt out of anything you are not comfortable with.
- Time-of-use features. If you pay time-of-use electricity rates, some models can pre-heat or pre-cool before peak periods. See our guide to time-of-use and ultra-low overnight rates.
Getting the most out of it
- Set a realistic schedule, then resist overriding it constantly.
- Aim for comfortable but not excessive settings; each degree of setback in winter typically saves a little on heating.
- Turn on away detection and make sure every household member is included.
- Pair it with air sealing and insulation. A thermostat cannot stop heat leaking out, it can only decide when to replace it. The upgrade sequence on our home energy page shows where controls fit.
Utilities and provinces frequently offer smart thermostat rebates or bill credits for joining demand-response programs. Program details change often, so use our rebate finder to check what is available where you live.
Frequently asked questions
Is a programmable thermostat just as good?
It can be, if you program it properly and do not override it. Smart thermostats tend to save more in practice because they are easier to use, adjust for occupancy and remind you when settings drift.
Can a smart thermostat damage my heat pump?
No, but poor settings can increase your costs by triggering backup heat. Choose a heat-pump-compatible model and use small setbacks.
Will a smart thermostat help if I rent?
Possibly. Many models install easily and can be swapped back when you move out, but ask your landlord first and make sure it is compatible with the building's heating system.
The bottom line
Smart thermostats save money by making good habits automatic, not by making equipment more efficient. If your heating bills are high and your current settings rarely change, one is likely a sound, low-cost upgrade, especially with a rebate. If you already manage setbacks carefully or have a very efficient home, the payoff will be small, and your money may go further on air sealing first.
Sundamentals is an independent, non-profit education platform. Program details and prices change often — check current programs for your address in our rebate finder.