They are the manufacturers of top of the line heating, air conditioning, and air purification equipment. They have 3 series for hvac, Infinity, Performance and Comfort Series. Infinity being the top shelf system and the Comfort series being the lower end of the cost spectrum. I do not have something formal written up, all I have are brochures the guys use for customers. I could probably summarize some of it but that would take awhile. But this should give you a start. If you go to the carrier website, Carrier, there are overviews of the different residential and commercial systems available.