I need a good source for the importance of conditioning outside air. I posted in residential about a trailer job I did where the fresh air duct was placed above the evaporator coil on a downflow Intertherm furnace. It comes with it piped directly to the blower bypassing the coil, which it doesn't come with a coil on it. By piping Texas summer hot air directly to the blower then intermixing with already conditioned 55 degree air, you would create condensation in the blower creating mold and rust. By intermixing with house air, filtering it and conditioning it, you are eliminating the condensation issue. There is a moisture issue in the house and they are trying to blame on me. I need some good ammunition for my meeting Thursday.