An efficient window is one that will keep you comfortable year-round and help reduce your energy usage in your home. Typically, windows are National Fenestration Rating Council (NFRC) tested for winter-time heat loss, or u-value, and summer-time heat load, or
What is an Efficient Replacement Window?
![What is an Efficient Replacement Window? What is an Efficient Replacement Window?](https://spectraseo.wpenginepowered.com/wp-content/uploads/2017/10/EnergyStar-500x350.jpg)