First off, I don't know much about HVAC systems as this is a first time purchase and am having a hard time finding research on the different brands. I know I need a 2.5 ton, 12 SEER unit as my house is 1350 sq. ft. I have had good bids from several experienced contractors that all have their own brand preferences. I have narrowed it down to Coleman, Carrier and Heil. The Coleman is by far the best price but I have not heard much about them. I would like to get more input from other homowners or professionals and was happy to find this site. Please let me know what you have heard about Coleman units - are they reliable, quiet, easy to get parts for, etc. Any information would be helpful as this is a major purchase and confusing for me. Thanks in advance for your response.