The time is fast approaching when all new window istallation will have to be energy rated. This is not only good for the environment but your bank balance also. At present there are not that many BFRC approved window manufacturers out there.
Happily, Prior Products is. We went through a lot to get our windows enegy rated and now offer a 'C' rated as standard and for a little extra these can be upgraded to an 'A' rated window. Put simply, these are the best that you can get for your house. Many companies claim to provide proper energy rated windows, but simply by going onto the BFRC website, you can tell who is selling you a dud, and who is selling you the real deal