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Comfort & Heating Savings Estimator
A broad range, with every assumption showing.
This is a conservative educational model, not an audit. If the range it produces looks uncomfortably wide, that is the honest answer to a question asked from a web form.
Roughly what you spend on space heating in a year, in dollars.
Electricity plus heating fuel, for the whole year.
The assumption this path depends on. We have to guess what share of your total energy spending goes to space heating. Change it if you know better — the number below drives everything on the right.
Natural Resources Canada reports that space heating is roughly 63–64% of the energy used in an average Canadian home. That is not the same as 63% of the money: a house heated with comparatively cheap gas and running everything else on costlier electricity will show a much lower dollar share. The defaults here are set by fuel for that reason.
Enter a figure and a simple payback range appears. Leave it blank and none is calculated, because a payback period without a cost is a made-up number.
Applies only to the five- and ten-year figures. The headline range contains no escalation.
What the numbers above are saying
Enter an annual cost to see an estimated range. Nothing is calculated until you do.
Comfort, which is the part people notice
Recommended next step
Free 15-minute Fit Check
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Read more about this work →What could change this result
- Weather. A mild winter and a severe one differ by more than most upgrades do.
- Energy prices, which are set quarterly and not by us.
- Thermostat behaviour, occupancy patterns and how many rooms you actually heat.
- The condition and efficiency of your existing heating equipment.
- How much of the leakage is actually reachable once someone is in the attic.
- Ventilation changes that may be needed alongside the work.
- Installation quality, which varies more between contractors than materials vary between brands.
- Whether hidden conditions turn up and change the scope.
- Whether the model's assumptions match your house at all.
This tool provides a broad educational estimate using user-entered information and general assumptions. It is not an energy audit, quote, rebate determination or guarantee. Actual results depend on weather, energy prices, occupant behaviour, existing equipment, building condition, ventilation, project scope and installation quality.
How this calculator actually works.
Every number the estimator uses lives in a single configuration file. Nothing is hidden inside the interface, and nothing is tuned to make a result look better than it is.
Savings bands, as a share of heating cost
| Scope | Band |
|---|---|
| Attic insulation and preparation | 10–25% |
| Targeted air sealing | 5–15% |
| Basement or rim-joist improvement | 5–12% |
| Attic plus air sealing | 15–30% |
| Whole-envelope package | 18–35% |
Combined scopes use their own band. Percentages are never added together, because two measures treating the same heat loss do not each save it independently. A hard ceiling of 42% applies regardless of inputs.
How your answers move the band
- Home age. Older construction shifts the band up; a house built after 2010 shifts it down considerably.
- Existing insulation. Deep, even insulation reduces what a top-up can add. Little or none increases it.
- Draft severity. Weighted heavily for air-sealing scopes and lightly for basement-only work.
- Treatment breadth. A first phase covering one area is modelled well below a broad treatment.
- Uncertainty. Every “not sure” widens the range rather than narrowing it. This is the opposite of what a sales tool would do, and it is deliberate.
Toronto heating degree days of about 3,520 (18 °C basis). Natural gas at roughly $0.42 per cubic metre all-in, electricity at about $0.175 per kilowatt-hour all-in. These are used to sanity-check what you enter and to provide context, never to overwrite your own numbers. Ontario energy rates are reset periodically and should be checked against your own bill.
Incentives, stated carefully.
Programs, funding levels, eligible measures and required sequences change, sometimes at short notice, and eligibility is determined by the program administrators rather than by a contractor. Some pathways require a pre-retrofit home energy assessment before any work begins, so the order in which you do things can matter more than the work itself.
The current sources worth reading are below. Information on this page was last checked in May 2026.
- Natural Resources Canada — Make your home more energy-efficient
- City of Toronto — Home Energy Assessments
- City of Toronto — Incentives and rebates
- Save on Energy — Home Renovation Savings
Latchline is not affiliated with any of these organisations, is not an energy advisor, and does not conduct official EnerGuide evaluations.
A number is not a plan.
The Scope Planner turns what you have noticed into a preliminary scope, and will carry your estimator answers across for you.