I've been dealing with Air Supply for YEARS but NOT because the might be the cheapest. They are fair and VERY RELIABLE. I just had a 3.5ton Carrier system installed in my upstairs by Jose and Victor. They treated my home like it was a spotless palace and completed the entire job in 5.5 hours. I watched them do some of the work and I have some a/c knowledge. These guys are METICULOUS professionals. As if my 18 year old York knew the guys from Air Supply were here, my downstairs compressor started making noises. I replaced the capacitor but I suspect I'll have Air Supply back soon to replace it with another Carrier. BTW, I did get quotes from 2 others. They were both higher and one of them failed to even see if my return could handle the larger unit I wanted. Almost forgot to mention that yesterday Ryan replaced a bad capacitor for my downstairs fan motor and made it a no charge part of my new unit purchase. Like I said, Air Supply is fair and VERY reliable.