How to Reduce Your Heating Costs This Fall: Practical Tips for Ontario Homeowners

Posted by

September 30, 2026

On September 17, 2026

Heating bills in Ontario don’t creep up, they arrive all at once. One week you’re paying $90 a month in electricity and gas, the next you’re staring at a $280 statement wondering what changed. What changed is that your furnace is now running six to eight hours a day, and most of that heat is quietly escaping through gaps, inefficiencies, and habits that are easy to fix once you know what to look for.

This guide covers the practical, high-impact changes Ontario homeowners can make this fall to reduce heating costs without sacrificing comfort.

Start With Your Thermostat, It’s Doing More Damage Than You Think

The single biggest lever most households have over their heating bill is thermostat management, and most people aren’t using it well. Keeping your home at 22°C around the clock through a Canadian winter is the equivalent of leaving a tap running, comfortable, but expensive and unnecessary.

The target most energy advisors recommend for occupied daytime hours is 20°C. Every degree above that adds roughly 3–5% to your heating costs. At night, dropping to 17–18°C while you sleep costs nothing in comfort, most people sleep better in a cooler room, and saves meaningfully over a full season.

If you have a programmable or smart thermostat, set it to drop automatically 30 minutes before you go to bed and begin warming 30 minutes before you wake up. If your thermostat doesn’t do this, it may be time to upgrade, smart thermostats typically pay for themselves within one to two heating seasons through savings alone.

Seal the Leaks Before You Heat the Outdoors

Ontario homes, particularly those built before 1990, lose a significant portion of their heating through air leaks. The most common culprits aren’t the obvious ones. Windows and doors account for some loss, but the real offenders are:

Electrical outlets and light switches on exterior walls, these have direct paths to the wall cavity and outside air
Attic hatches, often uninsulated and poorly sealed
Plumbing and electrical penetrations, anywhere a pipe or wire enters from outside
Fireplace dampers, if you have a wood-burning fireplace you don’t use in winter, a plugged chimney balloon can save hundreds of dollars a season

Weatherstripping around doors and windows costs very little and takes an hour. Foam backer rod and acoustic sealant around penetrations in your basement are equally inexpensive. A single afternoon of sealing can noticeably reduce what your furnace has to do every day.

Your Furnace Filter Is Costing You Money Right Now

A clogged furnace filter forces the blower motor to work harder to pull air through the system. The furnace runs longer, uses more gas or electricity, and delivers less heat to your living space. It’s one of the most overlooked efficiency losses in a typical Ontario home.

Check your filter now. If it’s visibly grey or it’s been more than 90 days since the last change, replace it before the heating season gets underway. A MERV 8 pleated filter runs about $10–15 and takes two minutes to swap. The efficiency gain from clean airflow across a full heating season is far greater than that.

Use Your Ceiling Fans, Reversed

Most ceiling fans have a reverse switch that changes the direction of blade rotation. In summer, fans push air down to create a cooling effect. In winter, running them on low speed in reverse pulls cool air up and pushes the warm air that’s collected near the ceiling down into your living space.

This is particularly useful in rooms with high ceilings where heat stratifies well above where you actually sit. It costs almost nothing to run a fan on low and can reduce the temperature difference between floor and ceiling by several degrees, which means your thermostat reads the room as warmer sooner and the furnace cycles off earlier.

Check Your Heating Zones and Vents

If you have a forced-air system, walk through every room and confirm that supply and return vents are fully open and unobstructed. A common misconception is that closing vents in unused rooms saves money, it doesn’t. It increases static pressure in the duct system, makes the furnace work harder, and can cause the heat exchanger to overheat over time.

For homes with multiple heating zones, set each zone appropriately: bedrooms can run cooler during the day, main living areas can be set back overnight. The goal is to condition the space you’re actually using, not the whole house equally at all times.

Look Into Ontario Rebate Programs Before the Season Starts

Enbridge Gas and the Canada Greener Homes Grant offer rebates for qualifying home improvements including insulation upgrades, smart thermostats, and heat pump installations. These programs change regularly, but as of fall 2026, Ontario homeowners can still access:

Enbridge Home Efficiency Rebate Plus, rebates for insulation, air sealing, and heat pump upgrades after a qualifying energy audit
Canada Greener Homes Loan, interest-free financing for eligible upgrades up to $40,000

A home energy audit, typically $300–400, identifies exactly where your home is losing heat and which upgrades qualify for rebates. For many households, the audit pays for itself many times over in rebate eligibility and energy savings.

Schedule a Furnace Tune-Up, The One That Actually Pays Off

An inefficient furnace burns more fuel to produce the same heat. Dirty burners, a misadjusted heat exchanger, or a blower motor running at the wrong speed all reduce efficiency without triggering any visible warning signs, the furnace just runs a little longer, costs a little more, and you don’t notice until the bill arrives.

An annual tune-up adjusts combustion, cleans components, and confirms the system is running at its rated efficiency. If your furnace is rated at 95% AFUE and running at 88% due to neglect, the tune-up recovers that 7% across every hour it runs this winter. If it was burning $200 a month in gas, that’s $14 a month back, from one service call. If you’re also considering whether your current system is worth maintaining, our guide on the best time to replace your furnace in Ontario is worth a read before the season gets going.

Small Changes That Add Up Over a Full Season

Some efficiency improvements don’t require a contractor or a product purchase, they’re behavioural, and they compound over six months of heating:

Open blinds and curtains on south-facing windows during sunny days, passive solar gain can meaningfully reduce how long the furnace runs on a clear winter afternoon
Keep interior doors open in rooms you’re heating to allow even air distribution
Run kitchen and bathroom exhaust fans only as long as needed, they pull heated air directly out of the house
Lower the water heater to 49°C if it’s set higher, most are shipped at 60°C, which wastes standby energy all day

The Difference Between a Comfortable Winter and an Expensive One

Reducing your heating costs this fall isn’t about being cold, it’s about not heating the outdoors. Sealing leaks, maintaining your equipment, using your thermostat intelligently, and understanding what programs are available to you can realistically reduce a typical Ontario household’s heating bill by 15–25% without touching the thermostat setpoint.