08/06/2026
Most people compare window quotes by looking at one thing, the total price. There's a number buried in the spec sheet that tells you a lot more about how the window will actually perform, U-factor.
➡️ U-factor measures how well a window keeps heat from escaping. The lower the number, the better the window insulates. Two windows can look identical and cost the same, and still have very different U-factors. When you're comparing quotes, ask for the U-factor on each one. It's a real, testable number, not a sales pitch.
Recommended window U-Factors vary by climate zone to optimize energy efficiency: northern cold regions require a U-factor of ≤ 0.30, mixed northern and midwest zones need ≤ 0.32, mixed southern areas target ≤ 0.35, and hot southern climates can use up to ≤ 0.60.
Not sure what you need for your home? We’ll help you compare your quotes! 🙂