In certain climates, mold growth is a large problem and concern. Even if you have an air conditioning, you might still have mold problems. Mold grows in warm humid locations. While air devices work to help keep the atmosphere cool and dry, mildew and mold will be able to present a challenge with an air system not properly maintained. Apart from the point that an un-serviced air product will create costly air con repair calls, it's definitely vital that you stop this with appropriate servicing each year.