Re: will shading outside HVAc compressors help at all?
You can get a quick idea of whether this even needs further investigation by measuring the air temperature around the upper condensor to see if it is being heated by the lower condensor. A difference of a degree or two probably will not justify the extra work, but at least you will have something to go on. The other thing to look at, of course, is whether the temp of the air being pulled into the lower unit is higher than the air temp 6 or more feet away from it. (Be sure not to be confused by reading with the thermometer in direct sunlight.)
Originally Posted by rollandelliott
Sunny Boy 3000US, 18 x BP Solar 175b panels, installed 2009.