Attic Fan Power Consumption

As you can see the consumption correlates to the wattage of the appliance.

Attic fan power consumption.

The electricity consumption of a ceiling fan ranges widely depending on the design and the speed setting of the fan. After attic fan installation ac still off during day. Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing. Consider a space heater which will use roughly 1 500 watts per hour.

When set at low speed fans use between 15 and 30 watts and at high speed they consume between 50 and 100 watts. During workdays would leave air conditioner off when leaving in the morning. Temp 92 f at 5pm. 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.

Attic power ventilators are simply not. The net free area of a vent takes into account the resistance offered by its louvers and insect screens. Attic ventilation will usually need to be increased to exhaust the fan s air outdoors. 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.

Energy usage of about 40 watts at medium speed is typical. A more helpful comparison may be to an air conditioning unit. Not many appliances in the home consume as little power as a fan. The attic fan kept my house cooler by 8f compared to pre fan installation days.

Temp 84f at 5pm. This was observed on numerous days following the installation.