CAME OUT ON A SERVICE CALL. INSTALLED A 4TON GAS FURN/COIL/HP CONVERSION 2TON PREM AH/HP W/2 T-STATS, AND REPLACE ALL FLEX RUNS. MADE SURE BOTH SYSTEM WAS INSTALLED PROPERLY. CHECK THERMOSTAT, CHECK ALL ELECTRICAL CONNECTIONS, CHECK AIR FILTER, CHECK GAS PRESSURE AND FOR PROPER VENTING. EVERYTHING IS RUNNING GREAT.