Windows seldom fail all at once, which is why so many homeowners miss the signs. The house just gets harder to heat. The spare room feels chilly in January. A faint draft by the couch gets blamed on the furnace or simply “the weather.” Each year the windows let in a little more cold.
A lot of homes across the GTA still have the builder-grade windows they were built with in the 1990s and early 2000s. Those windows are now reaching the end of their working life, and the cost of that is higher than most people assume. According to Natural Resources Canada, windows, doors and skylights can account for up to 25% of a home’s energy loss.
Here is how to tell whether yours are still pulling their weight.
1. You Can Feel the Draft
On a windy day, hold a lit incense stick near the edges of each window and watch the smoke. If it wavers, air is getting through. For another check, close the window on a sheet of paper. If the paper slides out easily, the seal is no longer doing its job. Worn weatherstripping is a cheap fix. Air leaking around a warped frame is not.
2. The Glass Looks Foggy From the Inside Out
Condensation on the room side of the glass on a cold morning usually means the house is too humid. Haze trapped between the panes is a different problem. It means the glass unit has lost its seal, along with the insulating gas that made it efficient. The window may look fine from across the room, but much of its insulating value is gone.
3. Opening a Window Takes Two Hands
Sashes that stick, cranks that strip and latches that no longer line up usually point to one of three things: a frame that has shifted, balances that have given out, or hardware past its lifespan. A window that won’t lock properly is also a security weak point, especially at ground level.
4. Stains or Soft Spots Around the Frame
Press gently on the sill and the lower corners of the frame. Soft wood, peeling paint, dark staining or a musty smell all suggest that water is getting in. This is the sign not to ignore. A leaking window can quietly damage drywall, insulation and framing, and that repair costs more than the window itself.
5. Your Bills Keep Climbing
If your heating costs rise year after year while your thermostat habits stay the same, the house is losing heat somewhere. Long winters and humid summers push older windows to their limits.
6. The Street Sounds Like It’s Indoors
Traffic, lawn mowers and neighbours’ conversations carry easily through old or poorly sealed glazing. Better glass and tighter frames can make a room noticeably quieter.
7. The Sun Is Bleaching Your Floors
Lighter hardwood near the patio door and rugs with a faded stripe are the work of ultraviolet light. Modern low-e coatings filter out much of it without making rooms feel darker.
Repair First, Replace When It Makes Sense
One bad seal or a broken crank rarely justifies new windows, and a good installer will tell you when a repair is enough. Replacement becomes the smarter investment when:
- several of these signs show up at once
- the frames themselves are compromised
- the windows have given twenty-plus years of service, and it shows
If you are weighing up replacing your windows, the technology has moved on considerably. Natural Resources Canada says ENERGY STAR certified windows are about 20% more energy efficient than the average window. Triple-pane glass with low-e coatings can do even better in a Canadian climate. Just remember that the installation matters as much as the product. A premium window that is poorly fitted will still leak.
Before you start, it’s also worth asking about provincial energy-efficiency rebates, which can take some of the sting out of the upfront cost.
Your windows have been dropping hints for a while. If you pay attention now, before the next cold snap, you can plan the project on your own schedule rather than in a hurry.