The short answer: yes, but it depends
Spray foam insulation does save money on energy bills — most Ottawa homeowners see a meaningful reduction in heating and cooling costs after installation. How much you save depends on how under-insulated your home was before, the size of the area insulated, and your home's overall air leakage.
The savings come from two things: better insulation (higher R-value, no gaps) and air-sealing (foam expands to fill cracks, stopping drafts that fiberglass can't). The air-sealing benefit is often the bigger contributor — air leaks can account for 30–40% of a home's energy loss.
Where the savings come from
Reduced heating and cooling: A well-insulated, air-sealed home loses less heat in winter and gains less in summer. Your furnace and AC run less, which lowers bills. Customers often report 20–50% reductions, especially in older Ottawa homes that had little or no insulation.
Smaller HVAC loads: If you're replacing your furnace or AC, a well-insulated home may need a smaller (cheaper) unit. This is a one-time saving that's easy to overlook.
Reduced moisture damage: Closed-cell foam resists moisture, which prevents the mold and rot that can require expensive repairs. This is a long-term saving, not a monthly bill reduction.
How to think about payback
Spray foam costs more upfront than fiberglass — typically $2,500–$7,000 for an attic or rim joist project, more for whole-home. The payback period depends on your energy savings. If you save $500–$1,500 per year on energy, a mid-range project pays for itself in 4–8 years — and then keeps saving for the life of the home (foam doesn't sag or lose R-value).
The payback is faster in older, poorly insulated homes and in homes with high energy use. It's slower in already-well-insulated homes. The comfort improvement — no drafts, even temperatures, quieter rooms — is a benefit that doesn't show up on a bill but matters every day.
When spray foam makes the most sense
The highest-ROI applications in Ottawa homes are: rim joists (the leakiest part of the envelope), attics (biggest heat loss area), and basements/crawlspaces (cold, damp, and drafty). If you're doing one area, start with the rim joists and attic — they deliver the most comfort and savings per dollar.
Spray foam also makes sense during renovations (when walls are open), for additions, and for homes with persistent drafts or ice dams (a sign of attic air leakage). If your home is already well-insulated and comfortable, the savings will be smaller and the payback longer.