Solar Attic Ventilation Fans
Have you ever had to run up to your attic to grab something in the middle of a hot day in summer? Do you ever notice how stifling hot it can get up there? Believe it or not that heat can transfer into your main living space and cause your cooling system to work overtime, even more so if your cooling components are located in the attic. A system that has to work harder is much less efficient and ultimately could be costing you a lot more money. Increased temperatures in your attic can also cause added wear & tear on your roof shingles and reduce their longevity. The solution? Active Attic ventilation.
Why do you need an Attic Fan?
In summer, temperatures in an unventilated attic can exceed 160 degrees. A properly sized attic ventilation
system will reduce attic temperature to 5-10 degrees F above the outdoor temperature. Ventilating
the attic reduces the amount of heat transferred from the attic to the home, decreases the load on the air
conditioning system (reducing your electric bill), and extends the life of your roof shingles.
In winter, heat trapped in the attic may melt snow on the roof, which trickles down and creates destructive
ice dams in the colder eaves.
Everyday home activities such as cooking and showering create moisture which collects in the attic and
promotes mold and mildew growth, reduces the effectiveness of insulation, and attacks the wooden attic
structure. Year round fresh air circulation from an Attic Fan removes this moisture and helps prevent
moisture related problems.
Attic fans offer an environmentally friendly and economical solution to summer time cooling problems
resulting from attic heat penetrating your home’s insulation. . The higher the temperature of your attic,
the less effective your attic insulation will be at stopping heat from entering your home.
Installation of an Attic Fan on your home minimizes the amount of heat entering through the attic by
reducing your attic temperature. By minimizing the amount heat entering your home, you will save
money on your summer cooling bill and make your house feel more comfortable (see diagrams below).
Things to Consider
• The cost savings due to reduced air conditioner load depends on the price of electricity in your area, and can be
even greater when installing a solar unit. Other factors include: the amount of attic space in your home, the efficiency
of your attic insulation, and the amount of ventilation your attic vent is able to provide. A typical installation
will usually pay for itself in savings within 1-2 summers of use.
• An Attic Fan should not be used when air from the living areas of the home can freely enter the attic. This would
result in conditioned air being removed from the home. Any openings between the attic and the home should be
sealed before an Attic Fan is installed.