Attic Fan Power Consumption

Attic ventilation will usually need to be increased to exhaust the fan s air outdoors.

Attic fan power consumption.

Attic power ventilators are simply not. You ll need 2 to 4 times the normal area of attic vents or about one square foot of net free area for every 750 cubic feet per minute of fan capacity. The net free area of a vent takes into account the resistance offered by its louvers and insect screens. Temp 92 f at 5pm.

When set at low speed fans use between 15 and 30 watts and at high speed they consume between 50 and 100 watts. As you can see the consumption correlates to the wattage of the appliance. The electricity consumption of a ceiling fan ranges widely depending on the design and the speed setting of the fan. However if your attic has blocked soffit vents and is not well sealed from the rest of the house attic fans will suck cool conditioned air up out of the house and into the attic.

You could run 30 fans using 50 watts for the same power consumption. During workdays would leave air conditioner off when leaving in the morning. The attic fan kept my house cooler by 8f compared to pre fan installation days. Consider a space heater which will use roughly 1 500 watts per hour.

Attic power ventilators energy consumption while the specifics will change with each home the general consensus is that attic power fans actually use more energy than they save. This was observed on numerous days following the installation. A more helpful comparison may be to an air conditioning unit. Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing.

Energy usage of about 40 watts at medium speed is typical. Not many appliances in the home consume as little power as a fan.