Salt Lake City is hot in the summer and cold in the winter. With fluctuating temperatures like these, your best bet is to look for a window with a low Solar Heat Gain Coefficient (SHGC) and U factor. A window with an SHGC and U factor of 0.3 lower would be a good choice for Salt Lake City.
These windows will save energy and qualify you for the Rocky Mountain Power efficiency rebate program at $0.95 per square foot for windows.
If you’re replacing your windows purely for energy efficiency reasons, you should give our online energy auditor a try. This tool is designed to give homeowners a better understanding of what’s going on with their house, suggestions on the most cost-effective upgrades for their home specifically and an estimate of much how much they can save through the upgrades.
You may find that you’ll be able to save a lot more money on your utility bills through measures like insulation and air sealing than replacing windows, especially when taking into consideration the cost of new windows.