Upon arrival in Elgin, I performed the A/C cooling evaluation and found that when I put it in cooling the emergency heat was kicking in. I pulled the wire to the emergency heat off the comfort control system and it stayed off when I put it in cooling. The comfort control system is faulted. I also found that the air movement system and the heat transfer media coil are extremely dirty with bacteria. i believe this is from sucking in hot air from the attic. Highly recommend having them both chemically cleaned and having the return air box seal from the attic space. Spoke with the customer about different options on the cleanings and repairs and he chose to go with HH14E and HH25A. This will take 1 tech 4-5 hours. Will need to bring the pressure washer, chemical cleaning products, bio protect, a 2 foot pieces of duct board. Will be completely sealing the return air box. Will need get the edge thermostat from RMI if not available we will install an ecobee pro.