Attic ventilation fans help cool attic air by blowing suffocating hot air 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. 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. Yes, in most cases you could benefit from an attic fan.
Attic fans draw warm air out of the attic and ultimately lower the indoor temperature. Typical penthouses will reach 120-150 degrees during the summer. An attic fan can help lower that temperature by up to 50 degrees, which translates to a temperature up to 5 degrees lower inside your home. Not only will you feel cooler inside, but your air conditioner will last longer since you won't need to cycle as much.
In addition, attic fans have been proven to help extend the life of the roof as well. An attic ventilation fan can help reduce humidity in the attic and thus inhibit growth. 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.
There's a lot of confusion around attic fans. Studies have shown that if your attic is well ventilated with a ventilation grille and your attic is well insulated, you wouldn't need an attic fan. A ventilation grille is an opening along the ridge of the roof that allows air to enter through the lower attic windows to naturally draw warmer air from the attic upwards through the ridge vent using natural convection. It may start to sound like attic fans aren't worth your time and could cause more problems than they solve.
Different types of homes, HVAC systems, and even climates affect the efficiency and potential benefits of attic ventilation fans. If you have good continuous ceiling ventilation and a ventilation grille, then any type of attic fan can be totally unnecessary. Locate the thermostat (small metal box) normally mounted on a beam or truss next to the fan in the attic. In most cases, a fan for the whole house is mounted on the attic floor, above a rectangular grille on the ceiling of a central corridor.
Attic fans can be a cost-effective way to stay cool during the hot summer months, while reducing your electricity bill and extending the life of your air conditioner and roof. I think the best solution may be a combination of radiant barrier to prevent heat from the sun from heating the attic structure, to begin with, along with proper ventilation, attic exhaust (s), insulation and air sealing. Instead of letting the heat settle and re-enter your home, attic fans “move warm, humid air out of your home and release it to cooler temperatures during the night,” says Zac Houghton, CEO of Loftera. According to Home Improvement Contractors of Staten Island, the main reason is that electric attic fans can create negative air pressure inside the home.
In addition, the thermostatic attic fan may be drawing air conditioning from inside the house, thus further decreasing any energy gain as mentioned by the U. Of course, a gable attic ventilation fan minimizes this risk because it is not installed on the roof, but vertically on the gable wall. Studies have been conducted that argue that attic fans do not reduce the energy use of a home's HVAC system. In many homes, electric attic fans draw air conditioning from the home and into the attic through cracks in the ceiling.
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 potential for hazardous conditions is greatest in homes that use power extractors during the summer, when gas appliances are turned on at the same time the fan is turned on. . .