Over time heat pumps collect dirt and dust from your home. When mixed with moisture, this build up inside the unit can turn into mold and bacteria. These contaminants become airborne and can have adverse effects for people with allergies and asthma, children, and the sick. A FreshFlo cleaning of your heat pump can save up to 30% on power usage for that unit. When dirty, heat pumps have to work harder to do their job. Dust and dirt build up chokes the air flow and makes the unit work harder. The harder it works, the more power it uses.