AC Repair Signs – Foul Smells Unpleasant smell or foul odors in your home can significantly affect the air quality and the indoor environment, causing discomfort for your family. The most common causes of unpleasant odors in your home are accumulated mold in the evaporator coils, mold or mildew in the ductwork, and a blocked condensate line. Because you can’t get rid of mold in these areas yourself, you must call a professional technician. You can always trust the Air Repair Pros to provide you with the best HVAC services in town! Call us anytime at (972) 625-1400 as we’re available 24/7!