Triple glazed windows cost 10–15% more than double glazed. In Ontario's climate — with heating seasons running October through April — that premium buys measurably better insulation, less condensation, and lower energy bills. Here is when the upgrade makes sense and when it does not.

Not all window frames perform the same. Fibreglass, vinyl, aluminum, and aluminum clad each have different lifespans, energy ratings, and maintenance needs. Here is how they compare for Ontario homes.