According to the EPA, the air inside your home is 2 to 5 times more polluted than the air outside. Today's efficiency minded homes are very air tight, causing pollutants to be trapped inside your home. Your home's comfort system circulates these pollutants when turned on. Even worse, moisture build up within your heating and cooling system can lead to the formation of mold, bacteria, fungi and other allergens. These pollutants can cause major health issues. Contaminants in your home's air can cause dizziness, headaches, nausea and can aggravate allergies and asthma.