Attic Fan Power Consumption

The net free area of a vent takes into account the resistance offered by its louvers and insect screens.

Attic fan power consumption.

After attic fan installation ac still off during day. Not many appliances in the home consume as little power as a fan. Attic ventilation will usually need to be increased to exhaust the fan s air outdoors. 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.

The electricity consumption of a ceiling fan ranges widely depending on the design and the speed setting of the fan. Attic fan ventilation attic fans are intended to cool hot attics by drawing in cooler outside air from attic vents soffit and gable and pushing hot air to the outside. The attic fan kept my house cooler by 8f compared to pre fan installation days. 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. 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. Temp 84f at 5pm. You could run 30 fans using 50 watts for the same power consumption.

This was observed on numerous days following the installation. During workdays would leave air conditioner off when leaving in the morning. Consider a space heater which will use roughly 1 500 watts per hour. As you can see the consumption correlates to the wattage of the appliance.

Energy usage of about 40 watts at medium speed is typical. When set at low speed fans use between 15 and 30 watts and at high speed they consume between 50 and 100 watts.