Recent Review: I called and a representative came out for a preliminary look of my house, explained what the diagnostic was going to reveal with respect to the degree of efficiency or lack there-of of my current set-up. I paid a discounted fee which was applicable to any new system I might purchase. Workers showed-up on time and I followed them around as they explained what their instruments revealed:: lack of insulation in interior walls and ceilings; the original cooler had to go; a later installed furnace and refrigeration unit was noisy and grossly inefficient--it had been badly installed in the first place several years back by a different company, in such a way that heat/cool air was escaping through the swamp cooler duct. Installing a good system was not going to be easy, I could see that for my self. My house has no attic. A tiny crawl space was the only access to the ducts. Nevertheless workers were able to install two ceiling exhaust fans, one in each bathroom. In the end I got a two phase Carrier unit where the cooler used to be. Insulation was pumped into the crawl space. The old furnace/refrigeration coil was removed and a new air return or up-take was cut into the ceiling in the hallway, away from the living room. I approved everything Gundlachs suggested except for a new roof raised four inches above the existing roof. My wife and I are very satisfied with our new system, and the good people of Gundlachs are easy to work with.