Yes, you can install an attic fan yourself if you are comfortable with basic carpentry, working on a ladder/roof, and handling electrical wiring. However, because it requires cutting holes in your roof and connecting to live power, many homeowners opt to hire an electrician.
Why should I hire a pro to install an attic fan? Unless you have previous electrical experience, you should always hire a licensed electrician for any electrical projects. Your electrician will discuss available options and help you select the best fan for your application.
Attic fans have fallen out of favor because they often do more harm than good. They create a "negative pressure" zone that can suck conditioned, expensive air out of your living space and pull dirty air, moisture, and allergens into your home. Additionally, they consume excess electricity and require regular maintenance.
Attic fans are frequently installed to cool down roof spaces, but they often do the opposite of what homeowners intend. They can draw conditioned air out of your living space, increase electricity bills, cause dangerous combustion appliance backdrafting, and can even contribute to moisture and mold problems if not designed and installed perfectly.
Yes, an attic fan helps cool a house. By actively exhausting trapped hot air from the roof cavity, it lowers attic temperatures by up to 50∘F on hot summer days. This prevents heat from radiating into your living spaces and reduces the workload on your air conditioning unit.
Running a fan (whether an attic fan or a whole-house fan) is significantly cheaper than running an AC. Fans use roughly 90% less electricity than air conditioners. However, fans and ACs serve entirely different functions and are best used in tandem rather than as direct replacements.
On a 90°F sunny day, attic temperatures typically range from 120°F to 140°F. The exact temperature depends on your home's ventilation and insulation.
While it can remove warm air, attic fans don't introduce cool air, which means homeowners in warmer climates will still rely on air conditioning units. Energy Costs– While running an attic fan isn't more energy intensive than a whole house fan; you won't see substantial energy savings.
To cool an attic cheaply, maximize natural airflow and block radiant heat. Clear your existing soffit vents of debris to allow cooler outdoor air to enter, and ensure ridge or gable vents are open. Next, install a DIY reflective radiant barrier under your roof to block up to 97% of solar heat.
When installing a whole house fan in an attic that houses a gas heater or a gas furnace with a standing pilot make sure to have a carbon monoxide monitor installed. Make sure you always have open windows and never run you're a/c when the furnace or a/c system is running.
On hot summer days, you can run your attic fan throughout the day and night. If temperatures cool significantly overnight, you can choose to turn off your attic fan until the morning.
For a 2000-square-foot home, you need roughly 6.56.5𝟔.𝟓 to 13.513.5𝟏𝟑.𝟓 square feet of total Net Free Area (NFA), which translates to about 77𝟕 to 1414𝟏𝟒 standard static roof vents.
They're installed and positioned to blow the air inside the attic outside and replace it with fresh air from the outside. This air exchange process yields several benefits, particularly reductions in both heat and moisture in the attic.
A residential roofing contractor has experience with attic maintenance procedures. They can adequately install an attic fan to ensure you don't have to bear any unnecessary expenses later. They can also help you choose the right attic fan for your home and individual needs.
An unvented attic traps extreme heat and moisture, causing severe long-term damage. In summer, trapped heat can reach over 150∘F, deteriorating shingles and radiating into your living space. In winter, warm, humid household air meets the cold roof, causing condensation that leads to mold, wood rot, and structural damage.
Electric attic fans typically do not save electricity. Because these fans draw power to run their motors, their electricity costs often cancel out the minor savings you get from lowering your air conditioning workload.
The 7 and 7 rule for attic conversions refers to the common requirement that finished attics be at least 7 feet wide and 70 square feet, with 7-foot ceilings over at least half. Keep in mind that this is a general guideline. Local building codes may have stricter requirements that supersede this rule.
How to fix a hot attic
Mice are curious and always searching for safe, snug, and warm nesting sites. Attics filled with blown-in insulation provide an excellent option–from the mice's point of view. As long as there is a ready food source. Mice are omnivorous and will eat and chew on almost anything including wood and electrical wires.
You should avoid using an attic fan if your home has air conditioning, unsealed attic-to-living-space gaps, or combustion appliances. Running a fan in these conditions can depressurize your home, pulling conditioned air into the attic and sucking dangerous carbon monoxide indoors.
Both the Maxxair Maxxfan Deluxe and the Fan-Tastic Fan are excellent, industry-leading RV roof vents, but the Maxxair is generally considered the better overall choice. Maxxair is superior if you want all-weather capability, while the Fan-Tastic Fan is ideal if you prioritize airflow volume and quiet operation at higher speeds.
Homeowners and designers are moving away from traditional, bulky ceiling fans in favor of sleeker alternatives. The primary replacements are flush-mount statement light fixtures for purely aesthetic spaces, architectural recessed lighting, modern bladeless fans, and upgraded smart ceiling fans that provide better airflow without dominating the ceiling.
Ideal Attic Temperatures
Ideally, the attic temperature should be close to the outside temperature, give or take 10 to 20 degrees. If your attic temperature is getting to 130 degrees or hotter, you can expect to see damage to your home.
The Short Answer Is: Yes! Lowering a thermostat by one degree can save you money on your heating or cooling bills. The exact savings depend on factors like climate, insulation, and the efficiency of your HVAC system, but it's estimated to reduce energy costs by around 1-3% per degree for each 8-hour period.
These policy recommendations are aligned with many of the goals identified in the 2022 California Extreme Heat Action Plan (EHAP). The state should consider a general maximum safe indoor air temperature of 82 degrees Fahrenheit (27.8 degrees Celsius) for residential dwelling units.