Installing an attic fan is one of the most effective ways to keep your attic cool during hot summer months. Attic fans work by pulling hot air out of your attic and replacing it with cooler outdoor air. This can make a big difference in lowering cooling costs and preventing attic heat from transferring into living spaces. In this blog, we’ll look at the benefits of attic fans, types of fans available, proper sizing and placement, costs, and important installation considerations.
Why Install an Attic Fan?
There are several reasons to consider an attic fan for your home:
Lower Air Conditioning Costs
By removing hot air from your attic, an attic fan can reduce heat gain and allow your AC system to run less often. This saves electricity and money during summer cooling seasons.
Prevent Ice Damming
In colder climates, attic fans help reduce ice damming by balancing attic temperatures and moisture levels. This minimizes melt/refreeze cycles on the roof.
Extend Roof Life
Excess heat causes roof materials to deteriorate faster. Attic fans remove heat to extend the lifespan of shingles and roof decking.
Improve Air Circulation
Stagnant hot air can lead to mold, mildew, and rot in your attic. Fans provide air circulation and ventilation.
Easy DIY Installation
Attic fans are relatively easy to install as a DIY project if you’re comfortable doing basic electrical work.
Types of Attic Fans
There are two main types of attic fans to consider:
Gable Mount Fans
As the name implies, these fans mount in the triangle gable end of your attic. They are relatively easy to install but work best on shorter rooflines.
Roof Mount Fans
Roof fans require cutting a hole in your roof decking to mount the fan. This type works well on any roof length.
Within these styles are fan variations like solar-powered, thermostat controlled, and variable speed.
Fan Sizing and Placement
Proper sizing and placement ensures your attic fan performs efficiently:
- Size for 2 air changes per hour minimum based on attic size.
- Place near the highest heat sources like recessed lighting.
- Install fans to draw air along the entire attic space. This may require multiple fans.
- Thermostat models turn on at 90-100°F to remove excess heat only.
- Solar models provide free operation but low airflow volumes.
- Gable vents maximize airflow when paired with gable fans.
Consult manufacturer guidelines for recommendations based on your specific attic size and layout.
Cost Considerations
Attic fan costs include:
- Fan unit – $100 to $500 depending on type, size and settings.
- Electrical wiring – $100 to $300 if an electrician is required.
- Roof shingles & flashing – $100 to $500 for roof mount installations.
- Installation – $200 to $1000 if you hire an HVAC or handyman service. DIY is cheaper.
Consider attic fan costs as an investment that pays off through lower AC bills and prevented home repairs.
Installation Tips
Follow these guidelines for safe, effective installation:
- Cut power before wiring electrical connections.
- Seal exterior openings thoroughly to prevent backdrafting.
- Connect ducting properly so exhaust flows outside.
- Flash and shingle roof penetrations properly on roof-mount fans.
- Position thermostat controls properly away from fan airflow.
- Insulate nearby ductwork to avoid condensation.
- Have installation inspected to ensure proper ventilation requirements are met.
Taking the time to install your attic fan correctly will ensure optimum performance and airflow for years to come.
Conclusion
Installing an solar attic fans is one of the best ways to save on cooling costs and prevent attic heat issues like ice dams. Choose an appropriately sized gable or roof mount fan for your specific attic layout and dimensions. With smart placement, proper wiring and ducting, and careful sealing and flashing, an attic fan can effectively vent hot air and keep your attic space comfortable for decades. Consult expert guidance to ensure your attic fan complements existing ventilation and is sized sufficiently. With minimal investment, an attic fan is sure to pay dividends through lower energy bills and reduced attic heat damage.
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