When replacing windows, you'll choose between double and triple-pane glass. Triple-pane adds a third layer of glass and another insulating gas-filled gap, improving performance for a higher price.
Efficiency and comfort
Triple-pane windows insulate better, reduce drafts and cold spots near the glass, and cut outside noise more than double-pane. In very cold climates the comfort difference is noticeable, and they reduce condensation on the interior glass.
Cost and payback
Triple-pane costs more and is heavier (which can affect the frame and hardware). The energy savings over double-pane are real but modest, so the payback is long — the bigger benefits are comfort, quiet, and condensation control rather than pure bill savings.
Which to choose
In cold climates like much of Canada, triple-pane is often worth it for comfort, quiet, and condensation resistance, especially on a long-term home. In milder areas or on a tight budget, quality double-pane with good low-E coatings performs well.