Oftentimes the coil of your furnace is the most contaminated point. This is due to it being the central point that all air passes through. Moisture created by the coil is a magnet for dirt and debris, potentially causing heavy build-up and dramatically reducing efficiency.
Coil cleaning increases your HVAC unit’s performance and prolongs its life. Dirty coils that aren’t cleaned can waste energy and be very expensive to replace. The coils in an HVAC unit, work hard to keep rooms either hot or cold. When these coils are not cleaned, they work inefficiently and can lead to more serious problems.