To determine whether your windows are drafty, try placing a burning candle by the window's edge on a cold day and see if the flame flickers. Although you need to spend money on repairs, it will help save on energy bills in the long run.
I contacted Chris from Longlife and he was very prompt, had excellent follow and answered all my questions. We had great communication.
I had them remove my 2 old patio french doors and installed 2 new Vinyltek sliding patio doors....
Paul and the team at Longlife were great to deal with. The windows were good quality and the team installing were very accommodating with us through the process and the install looks great!