Windows leaking air, they tried to replace weatherstripping by hacking into the sash to replace, that helped some but didnt fix.They tried to stuff some foam in the weep holes on the inside to fix, that helped but only put a bandaid on the real problem which is the cheapness of manufacturing. crappy install/caulking.
Condensation problems, they try to tell me run a dehumidifier in the the winter in minnesota, I dont think so! These windows have inferior design. Have had 2 seal failures. I know these windows have water/mold issues after talking to my neighbors who had bad mold underneath their sliders on the track they slide on.
They told them to run dehumidifier also and gave them some humidity packet that didnt mean anything tangible.
Run away from window world minnesota fast. The old saying still stands true, you get what you pay for.
Review about: Window World Window.