Heil Vs Carrier . I am looking at a 96 % efficiency 2 stage furnace. Carrier units use new technology. 4 Ton 14 SEER Mobile Home AirQuestHeil by Carrier Heat Pump A/C & Coil from www.ebay.com The higher the seer or hspf ratings, the larger the price tag. With carrier, you get 5 year parts and no replacement warranty. Their gas furnaces can be matched with a heat pump condensing unit for a dual fuel heat pump system that some manufacturers call a hybrid.