In my 34 years in the HVAC trade, I have found that 80% of all compressor failures are from poor installation practices. I Have worked for companies that sell Trane, Lennox and Carrier products. IMHO if you stay with the big three you will do good. Lubbockguy has some very valid points about manufactuing practices today. I would be more concerned about the installation than anything. Clean, professional installers that use proper practices. I have seen many guys that braze refrigeration lines without purging with nitrogen, use soft silver solder, mount lines to where vibration and noise transfer into home and do messy wiring. get bids and references. LOTS OF REFERENCES. if they won't give you refernces from their customers,,Walkaway!!!!!! Look closely at each individual warranty. Do not be afraid to ask a lot of questions, this is an important purchase, Best of luck to you.