Arrived onsite to customers home to replace their old carrier furnace with a failed heat exchanger. Turned off power and gas, disconnected wiring, gas and venting. Installed new furnace, made all required connections. Converted furnace to propane, set gas pressure to manufactures specs, 2nd stage 10 inches wc, first stage 6” wc. Tested system for 45 minutes. Supply air temperature in first stage was 88 degrees, supply air temperature in second stage was 101, return air temperature was 54 degrees. As the return air temperature climbs the supply air temperature will climb. Thank you for choosing CPI Plumbing and Heating Inc.