Arrived onsite to customers home to replace his furnace. Removed existing furnace, ac is previous to furnace replacement and was performed by others. Reused existing filter cabinet (20x20x4) installed new furnace with a transition. Connected gas, low voltage, line voltage, venting, and ducting. Sealed all ducting. Turned furnace on and confirmed operation, supply air temperature in low fire is 100 degrees with a 63 degree return. Supply air temperature in high fire is 111 degrees with a return temperature of 65. No co is present in the duct stream. Ran temperature in the home from 63-68 degrees. Performed full start up proceedure, including gas pressure, pressure switch pressure, flame sensor reading, Inducer motor amperage, blower motor amperage, and temperature readings. Thank you for choosing CPI Plumbing and Heating Inc.