When you go looking for windows, whether you have to replace one that got broken or you are just feeling that your house is in need of a window upgrade, it may be tempting to buy some off the shelf of your local home improvement store, checking only to see that they fit the space left by the old window. There are two advantages to spending a little more time on finding the perfect window. Saves Energy By Fitting The Climate Every location has its own climate. Some places are cool most of the year and some places are warm. This is why it is a good idea to have your glass windows tailored to the weather conditions that your home will face. For instance, if you live in a cooler climate, you will want windows that are well insulated. In science-sounding terms, it should have a high R-Value or thermal resistance, a number that expresses how much a material slows down the transfer of heat to cold spots. The US Department of Energy has a map detailing which R-values are best for ...