Newpro is a Massachusetts company which offers windows and doors. If you call their number, they will come to your house and give you a quote, and explain how their windows work. The salesman who came to our house was extremely prepared and had samples of the windows to show us. We were initially very surprised at their prices - these windows aren't cheap, but after buying a few for our home, we were very impressed with how they kept out the cold in the winter. The installers were friendly and did a good job putting in the windows.