AC filter
I have 3 roof top ac units. I checked the inside coils and they are very nasty. It appears that the cheap sponge like factory filters don't work well. I do keep them clean but too much junk gets by th...
Forum Discussion
Foam filters don't filter very well so they need to be cleaned often. I wash mine after a week of operation. It does help if you use filter spray which helps with holding the dust and pollen in the filter rather then letting it pass on to the coil.
