The negative pressure created by the attic fan causes carbon monoxide to return to your home, rather than being exhausted through the chimney. This can create a potentially dangerous condition for your family. Even though an attic exhaust fan can gradually reduce the temperature of a very hot attic, using a fan does not stop the radiant heat source. During the day, any cooler air introduced by the fan will be immediately heated by the surrounding structure.
At night, after the sun's radiation source stops, the structure will remain warm for some time. Any cooler air brought in from outside will eventually lower the temperature of the attic structure, but that will happen VERY slowly. As soon as the sun rises in the morning, the radiant heating process will begin again. An attic ventilation fan can help reduce humidity in the attic and therefore inhibit mold growth.
During warm weather, the sun will heat the roof, which will be transferred to the attic. Attic fans remove warm attic air, and that can also help keep the rest of the house cooler. Warm attic air can leak into your home and make your air conditioner work harder and more often. Not only does this increase your electricity bill, but it can also decrease the lifespan of your units.
If your home has problems with hot and cold spots, you could benefit from a whole-house fan. If you have problems with a hot upper level or with ice dams, an attic fan might be better. Jay, no, you're not turning the wheels. Extractors keep home attics cooler.
However, in the case of homes, they can create other problems (for example, as long as you don't have air conditioning in the warehouse, it would be a good use of an exhaust fan to cool). Attic ventilation fans help cool attic air by expelling stifling hot air from inside the attic and bringing in cool air from outside. This prevents warm air from leaking into your home and raising the temperature in the living space, reducing the load on the air conditioner. The solution is simple, make the whole house ventilate to the outside instead of to the attic.
For example, if the thermostat is set to 90 degrees, the fan turns on when the attic reaches 90 degrees and otherwise stays off. By drawing damp, stagnant air out of the attic, attic fans help prevent moisture from building up and ultimately help create less inviting conditions for mold. However, this risk can be mitigated by following the manufacturer's instructions for the electric attic fan. Adding fans in the attic, along with other energy-saving fans, such as window and ceiling fans, can create an efficient cooling system in your home.
The air of makeup isn't something that a lot of people think about on a regular basis, but it's important when talking about attic fans. If you have appliances that use natural gas or propane, an electric attic fan can cause exposure to carbon monoxide. If they have attic ducts, poor attic insulation and good air sealing, cooling the attic will have a greater effect on the cooling load inside the house. A primary benefit of attic fans is that they help maintain the integrity of asphalt roofing shingles to decrease deterioration and prevent deformation.
If attic temperatures are 140 degrees in summer, which I often see, the corresponding heat loss in winter would require 10 degrees in the attic. So if you're wondering if an electric attic fan will help you save electricity, the answer is probably not what you save, it will be a near even exchange for what you use. Running the attic fan will draw this cool air up and into your living spaces, which could cause the temperature to drop significantly. One of the most common reasons for a bad experience with attic fans is poor installations that result in leaks and roof damage.
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