Attic Temperature Too Hot

An unventilated attic can reach 150 degrees in the heat of summer 50 degrees higher than it should be.

Attic temperature too hot.

An overheated attic can bake asphalt shingles on the roof and cause them to deteriorate. But by adding powered attic fans you will draw more air into the attic. Whether it s 110 f or 130 f there s not much difference in the amount of heat flowing from the attic to the living space below. Unless your roofing system has insulation on the roofing deck and is designed without ventilation your furnace should not be heating your attic.

This is because the attic is essentially open to the outside air. And it can cause your air conditioner to work harder than it needs to and send your energy bills soaring with the temperature. In addition hot air in your attic could increase moisture levels which could result in wood rot and mold growth. That is certainly too hot but how hot is ok.

If it s 90 degrees outside the attic temperatures shouldn t. If your attic soars above 100 degrees and reaches the 150 mark its time to consult professionals. Note excessive heat. Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures.

The thermostat will usually start at 95 degrees fahrenheit which is the temperature that the attic fan usually starts at. Just make sure the ceiling is airtight and fully insulated and the temperature in the attic doesn t matter much. Using insulation only keeps the attic s heat from traveling through your home. Poor insulation is usually the culprit although if you enter the attic on sunny winter day your attic space can be warmed by the sun more than your furnace.

Having a properly vented attic is the best way to keep attic cool because it allows the hot air to escape during the summer. If hot air is allowed to sit in your attic it could overheat the shingles on your roof and cause damage.