What R-Value Actually Means for Replacement Windows
R-value measures resistance to heat flow — higher is better — but window manufacturers and energy labels more commonly use U-factor, which measures the rate of heat transfer and runs the opposite…
R-value measures resistance to heat flow — higher is better — but window manufacturers and energy labels more commonly use U-factor, which measures the rate of heat transfer and runs the opposite…
Low-E (low-emissivity) glass has a microscopically thin metallic coating that reflects heat while still letting visible light through — in Wilson’s climate, the coating variant that matters most is one tuned to…