I have storms and screens I change in the spring and fall. There's rotten wood around 3 of the windows. So I am thinking of replacing the windows and getting the wood fixed. I have looked at Comfort Line windows. The ones I saw had a R value of 4. I would like to know if Marvin windows, Anderson windows, and Eagle windows are just as good as the Comfort Line windows. I am looking at the double hung windows. I also have ranch windows that the salesman from comfort Line advised replacing as well. I would just like to know what would be the best brand.