Inside device The evaporator coil fits inside the furnace plenum. The plenum may be the portion in the furnace on possibly side on the air handler, where air is brought in and sent back out into the home. Your ductwork may be leaking out air, your insulation can be ineffective, https://eco-friendly-commercial-v11863.collectblogs.com/75054951/considerations-to-know-about-eco-friendly-commercial-ventilation