Energy-efficient windows are judged on their performance according to a few different factors, including heat transfer, air leakage, light transference, and condensation resistance. If you're unsure whether a window is energy-efficient, look for an ENERGY STAR® label from the U.S. Environmental Protection Agency (EPA). If various products, including windows, meet energy-efficiency standards set by the federal government, the EPA issues this label to help consumers identify energy-efficient products.

One drawback is that window film can reduce the amount of natural light entering a room, particularly if you opt for a darker or more opaque film. Additionally, if not installed properly, window film may develop air bubbles or wrinkles, affecting its appearance. Over time, certain types of window film may also experience discoloration or peeling. Moreover, certain window films can interfere with wireless signals, such as Wi-Fi or cellular reception. Careful consideration of these potential drawbacks is essential when deciding whether window film is the right choice for your home.

Modern windows provide enhanced UV protection, improved heat retention, and cooling efficiency, contributing to overall household energy savings.

The best windows to tint are those that get the most direct sunlight—particularly sunroom windows or windows facing the south or east where the sun shines most brightly throughout the day. If your pets have favorite windows to lie in front of, you may want to consider those, as well, to protect their skin from sun damage.