Can anyone answer this air conditioning question for me.
My daughter lives in a two story house, with two units, one for downstairs and one for upstairs. Downstairs unit is working and cooling okay, upstairs unit runs all the time (blows air but the air does not feel cool at all) and it is beyond hot up there. My son-in-law says it is from the heat rising from 1st floor and the high temps outside and his solution is to open a window up there and put a fan in to blow hot air out. I say the upstairs unit is not working right and needs to be checked for problems. Anyone offer suggestions? Thanks!!