Good attic ventilation helps keep temperatures even preventing hot and cold spots that cause damaging ice dams where water can back up and freeze beneath your shingles.
Attic cold in fall.
Adequate attic ventilation allows cool dry air from outside to come into the attic while warm moist air inside the attic can escape.
The biggest issue is attic rain.
During cold winter months the attic vent fan is not necessary.
If your attic is too cold it probably lacks sufficient protection from outside temperatures.
Attic flies common this winter by donald lewis department of entomology the large black pesky flies that show up in bed rooms and on window sills from late fall through early spring have been very abundant this year possibly because of the wetter than normal weather we had last summer.
Department of energy doe the average unimproved attic has just r 19 insulation the insulation value of a five and a half inch thick fiberglass batt.
According to the u s.
A phenomenon caused by prolonged cold spells and improper ventilation.