An unventilated attic can reach 150 degrees in the heat of summer 50 degrees higher than it should be.
Attic so hot it heats the house.
Another problem is any ducting in the attic will be heated and the heat will transfer into any the duct and warm any cool air moving through it and into the home.
Using insulation only keeps the attic s heat from traveling through your home.
This results in higher cooling bills and the need for thicker insulation above the ceiling.
If you had a thermostat in the house and in the attic so that it would only run when you need heat and the attic is hot.
Not the overabundance but the lack of insulation in the attic.
High temperatures inside your attic shorten the life span of shingles.
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.
And it can cause your air conditioner to work harder than it needs to and send your energy bills soaring with the temperature.
Excessive heat deteriorates items you store in the attic and can cause moisture.
The attic is a huge determinant in keeping your entire home cool so the first place to start cooling your home should be the attic.
Unless your roofing system has insulation on the roofing deck and is designed without ventilation your furnace should not be heating your attic.
Having a properly vented attic is the best way to keep attic cool because it allows the hot air to escape during the summer.
But by adding powered attic fans you will draw more air into the attic.
It would need a damper to keep from losing heat when not in use.
A hot attic is bad for several reasons.
In addition hot air in your attic could increase moisture levels which could result in wood rot and mold growth.
Within the attic insulation is a must.
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.
An overheated attic can bake asphalt shingles on the roof and cause them to deteriorate.
If hot air is allowed to sit in your attic it could overheat the shingles on your roof and cause damage.
Another reason your attic is so hot is because of insulation.
Just make sure the ceiling is airtight and fully insulated and the temperature in the attic doesn t matter much.