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As you comparison shop, look beyond materials and design and evaluate the A, B, C ratings.
A) Air Tightness - rated A1, A2 or A3 to reflect increasing levels of air tightness. Fixed windows tend to have higher ratings. Sliders tend to be "leakier" than casement windows.
B) Water Leakage - resistance to wind-driven rain is rated from B1 to B7. The higher the number, the more resistance to wind-driven rain penetration.
C) Wind Resistance - Ratings range from C1 to a high of C5. CMHC advises a minimum of a C2 rated window.
Glazing – Triple-glazed windows help reduce noise transfer from outside, and tend to be better insulators than double-glazed windows.
Low-emissivity (Low-E) windows enhance energy efficiency. Low-E windows have a thin coating of metal oxide on the inside window pane that filters UV rays and blocks interior heat from escaping through the glass.
To find out about available government grants and incentives for making energy-efficient home upgrades, check out: