They need to be open in the summer.
Open or closed attic.
Would it be better to keep them closed to keep out rain or open to allow ventilation.
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To provide background the house has a hot unfinished attic with blown cellulose and fiberglass insulation beneath the floor and no insulation along.
Although air should circulate year round through the attic your house will probably be more comfortable if you cover the foundation vents in the winter.
My home has a whole house fan installed in the upstairs hallway ceiling when its cool at night that thing can suck the heat out of the house in record time.
It even rained and the sill got wet but not the floor.
Here s what s open or closed in la oc ie vc.
After leaving the attic window open overnight it was amazing how cool it got in there.
My parents house has two small windows in the attic that open.
When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still.