or cardboard under the return air side of the coil to catch any debris before it gets into the furnace or air handler. 2. If the coil is coated with oil or grease, clean with a mild detergent and ...

A more-efficient fan motor will reduce electricity only if it raises the SEER of the air conditioner, he continued. "It may not be worth it on a 13-SEER unit." If the homeowner replaces the furnace ...