Should you close vents in the attic during winter?

The eaves offer ventilation for the roof. The vents serve two purposes, to let trapped air out and to offer air circulation to keep an abundance of moisture from being trapped inside. Any gable vents (the ones at the ends of the roof) don't need to be closed. The reason is because any heat that is escaping through the ceiling should be held in by insulation. If you stick your head up there and feel a lot of heat, then your insulation is failing to some degree. Imagine your room ceilings being like a box. It should be sealed, no holes to the attic area, right? Then imagine the attic being an area above those sealed rooms. Two different entities. The insulation on the attic floor is to keep a buffer between the attic air and the room air. If you reached under the insulation and touched the ceiling, you could feel the room heat radiating from below. Then feel the top of the insulation. It should be the same temp as the attic, a bit cooler than the ceiling temp.

So, unless the insulation isn't thick enough (rated by "R" factors) to hold the heat (or coolness in the summer) inside the room from above, then you would need at increase the insulation. If it seems to be doing it's job, holding the house temps in, then you certainly would do more harm then good by closing your attic vents.

Leave them open...my recommendation.

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There should be NO hot air in the attic in the first place (during winter that is). Not even warm air. You should have enough insulation up there so that the attic doesn't get warm in the first place. Allowing the attic to ventilate itself in the winter is desirable to prevent moisture or humidity buildup that can lead to ice or frost formation inside the attic (leading to mold) and ice buildup on (and over) the gutters. If you are sure that your eaves are ventilated, then yes you can cover the wirlly bird (or just lock it so that it doesn't turn). It's a balance. A cold wind constantly whipping through your attic is not necessary and will be a source of heat loss even if your attic is well insulated. A poorly insulated attic will leak household air into the attic and you do not want to keep that air trapped in the attic. So before you close off too many roof vents, make sure your attic is sealed so that no household air gets into it. That means all kitchen and bathroom vents (all vents) are routed through the roof to the outside. Venting kitchen and bathroom fans into the attic is bad bad bad.

Attic Vent Cover

Do not close the vents unless you want mold and condensation problems throughout your home. Your house needs to breathe. Not a silly question, and is good you asked instead of just proceeding to do something that will cost you in the long run.

Absolutely NOT,u could get ice dams ,moisture condensing on attic ceiling and dripping onto attic floor when it warms,,,the attic should be within 3-4 degrees of the outside temp.,,,,u should have at least 12- 18 inches of insulation in your attic,,depending on where u live

No. Condensation will form, which will cause the insulation to get wet, making the insulation completely useless. The condensation might soak through the ceiling, thus damaging the drywall, joint compound, texture, and paint. Mold will form, which many people are allergic to.

Don't do it.

Yes

if you want mould and condensation then yes go ahead ...other than that leave well alone