I have a house built in 1981. Wooden windows. Most of the windows are fogged up due to leaks in the gas seals. Most also are very drafty and the spring systems seem pretty much shot, because the bottom sash won't stay up when I open the window, and the top sash slides down on its own when the window is unlocked.
I was looking into replacements, and saw a lot of talk on the web about sash replacement systems, where you just replace the sashes and the spring/weight system in the window, leaving the frames. I don't have any rot or anything in the frames, so this seemed like a good alternative to full replacement, since they don't cost as much and, most importantly, I can do it myself and save installation costs.
But, my current windows do not have storm windows. They just have screens, and those don't even slide up and down, they just snap into place.
Now, my question: If I want to get storm windows (and I do), can I still do something short of replacing the entire window, frame and all? If so, what? (again, preferably a DIY job).