If you’ve been researching attic ventilation, you’ve probably heard about attic fans. Regardless of what type of insulation you have in your attic, ventilation helps to control the humidity and temperature of your attic space. Humid, hot air leads to mold and mildew growth that can destroy the foundation of your attic, degrade your roof and lower your home’s value.Many homes, especially older homes, lack adequate ventilation in the attic. Adding baffles is a no-brainer, but without roof vents or ventilated soffits, your attic may be lacking in ability to properly discharge hot, humid air. If you have an HVAC system located in your attic, or have ductwork running through your attic, an attic fan can help improve the efficiency of your unit. Regardless of the insulation on your ducts, high heat and humidity lead to more strain and a shorter unit lifespan. Air traveling through exposed ducts heats up quickly and can contribute to inadequately cooled rooms.