Most Colorado Springs window contractors will sell thermal replacement windows without ever discussing the U Factor ratings, but as a consumer you should always ask for these numbers before deciding what you will buy.
The NFRC ratings are done in the following areas:
- U-Factor – measures the amount of heat loss that occurs through the window
- Solar Heat Gain Coefficient – measures the level of “heat gain” during the summer months.
- Air Leakage – measure how much outside are will get through during cold weather months.
- Condensation resistance – measures the windows ability to resist condensation, which has an impact on energy efficiency.
- Visible transmittance – measures the amount of light that can pass through a window, and has less to do with energy efficiency than with homeowner preference.
As a Colorado Springs window contractor, I encourage my clients to look at all of the relevant NFRC ratings, as each of them play a role in determining which type of window is best for their needs.