Q: Why do old windows even need to be replaced?

A: Energy Loss: About 25% of your energy bill is lost through windows. A 3'X5' window with a 1/16" gap around the sash is like having a hole the size of a brick
    Condensation: Energy-efficient windows have a warmer interior surface, so they can increase humidity without getting damp on the windows that could eventually damage the walls. Reducing condensation also helps reduce mold growth.
    Air Quality: Tight-fitting windows keep out dust, bugs, pollen and sound—so the indoor environment is healthier.

Q: Condensation was a nuisance on my old windows, but I've heard it can cause damage too. really?

A：Condensation can be a serious problem. Moisture from everyday activities like cooking and showering shows up first on cool, dense surfaces like windows. In the long run, this drip can damage windows and nearby surfaces, such as drywall, and promote the growth of mold, a potential health hazard. One solution is to reduce humidity, but the levels aren't always low enough, especially in winter when moisture is needed to prevent drying out. A better solution lies in windows itself.