It's due time to upgrade the windows in my small house located in NE Wisconsin. It's a small house and only need to worry about replacing 12 windows in all. The Anderson wood windows were last replacing approximately 20 years ago but the seals on the three West facing windows are bad. Also, I know there's definitely energy being greatly wasted through these windows, both during summer and winter. I'm planning to replace half this year and the remainder next. I have a contractor friend who will be handling the install, so no worries there.

As mentioned, I'm focusing on the two south-facing windows and three west-facing windows this year. Due to neighboring structures and orientation of my house, the south and west windows (both unshaded) radiate enormous amounts of heat into the house during summer and make the AC work harder. During winter, with a lower sun angle, neighboring houses and trees do not provide much in the way of heating through those windows.

Therefore, am I correct in assuming I want to look at windows with the lowest SHGC for the west/south side? Any other advice I'm not thinking of would be greatly appreciated.