Do Solar Attic Fans Really Help

The point of having an attic fan is to lessen the load on your ac system saving you money.

Do solar attic fans really help.

It will offer you more benefits that include. Solar attic fans work by pulling in the cold air from the soffits and pushing out the hot air that has accumulated at the top of the attic. The attic fan just helps the air move more which adds cooler air circulation. Attic fans can create a negative pressure condition in your home causing vented appliances to backdraft.

In addition to soffit gable and or ridge vents you may want to add a power vent fan to your attic to increase air circulation. However the utility of attic ventilation fans is actually quite a controversial topic. Good insulation reduces fan effectiveness. This pressure balance improvement and the cooling provided by the air flow are most significant in the case of a leaky ceiling.

If the angle of the sun is lower in the sky morning and late afternoon or the sun s rays are trying to cut through thin clouds or haze the fan spins slower moving less air. If a cloud blocks the sunlight the fans slow or stop. But they re much easier to install since no wiring is needed. Cold air is at the bottom and warm air is at the top.

To determine the number of cubic feet per minute needed for a power vent fan multiply the number of square feet in your attic by 0 7. Attic fan savings claims. This backdraft can bring dangerous and toxic fumes into your home like carbon monoxide an odorless and deadly gas. For the attic fans to work at peak efficiency they need to be on a south facing roof slope if you live in the northern hemisphere.

A significant amount of that cooling is likely to come from conditioned air being sucked up from the house below. Exhausting moderate amounts of attic air as solar fans do can counteract this reducing infiltration my calculations show it to be about right for a vented attic but either do the calculations or measure the pressures. Solar powered attic vent fans usually don t move as many cubic feet of air per minute cfm as hardwired fans. The single solar powered attic fan i have has not lowered the temperature in my attic at all.

One reason power attic ventilators don t help in my original article i focused on makeup air. Using the simple physics principle of air circulation it can draw in cool air while letting out the warm air. Yes the solar powered attic fans spin at different speeds. It also provides a lower profile then other ventilation options so that you can streamline the look instead of using bulky items that can cause distractions.

Yes attic fans can make a difference. Do attic fans really help to cool a room. That is i said that when you run a power attic ventilator in a typical house yes it will cool the attic down. This is basically how air naturally moves.