The worst... American home shield contracts with them and I have already reported the following issues :
1) Tech claimed unit was dirty and needed to be acid washed (see other reviews for this)
I had another a/c company come and look at the unit, they said it wasn't bad, but I had it acid washed by the other company anyway
2) Air pro master contacted AHS and advised them to decline coverage even though the AHS contract states that coverage is provided even with lack of cleaning or maintaining unit.
3) Air pro master told me that nothing had been done, but AHS said parts were replaced and the other a/c company said someone had been "messing" with it.
I wasn't on the roof, but after reading the other reviews; I don't want anything to ever do with this company again. Interestingly, a bunch of the positive reviews are from out of state people. Hmmmmm