When you are picking out windows, doors or skylights for your home, you will have a lot of factors to take into consideration. Not the least of these is how well or poorly the product in question will transfer heat into your home or help to block it out. Luckily, there are actually energy performance ratings listed on most windows, doors and skylights so that you can make the most informed decision possible about which product is best for you.
But what do these ratings actually measure? There are actually several categories that are reflected on the energy performance label, and understanding what these various statistics mean will help you pick out the best product for you.
For instance, the Solar Heat Gain Coefficient (SHGC) is something that reflects how well the window transfers heat from the sun into your home. A low SHGC means that the window lets in very little heat, while a high SHGC indicates a product that allows a great deal of heat to pass through into your home. The right one for you, however, depends on your own particular needs.
If you live in an area with a mild summer but a harsh winter, you may be interested in allowing the sunlight to help heating your home in the winter. And if the summers are not that extreme, you might not mind the heat coming in at that time of year.
The opposite would be true if you live somewhere that has very hot summers, though. In that case you might want to keep out as much heat from the sun as possible and be content to heat the house all on your own in the winter. So the ideal SHGC for you can vary depending on your own particular circumstances.
Other elements taken into account when the energy performance of windows, doors and skylights is measured are the amount of visible light the product lets in, how well it insulates your house, how much air is allowed to leak out through joints in the structure of the product and how resistant it is to allowing condensation to develop.
All of these elements will impact how well you are able to maintain a comfortable indoor environment all year round and how much it costs you to do so. Because of this, it can be worth paying a bit more for a door, window or skylight if it means that you will save on your heating or cooling bills every month because of that product.