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Attic ventilation can be as important in the winter as in the summer. The vents allows the air space in the attic from having a build up of moisture. With the vents closed, there could be times the humidity in the attic would be high enough to cause mold and mildew on the lumber, especially the roof sheeting. In the summer the vents allow heat to be vented out and in the winter they allow moisture to be vented out. Not an expert? Just been in the HVAC & insulation biz for 41 years Eric S.
Wiki User
∙ 15y ago
Wiki User
∙ 14y agoNO never close off your cold air return.this causes the blower fan to "starve" for air reducing the units efficiency. it may feel like cold air is coming out of the registers,but in-fact the cold air is being pulled into the register from the room so it can be heated by the unit.
hope this helps.....
HVAC tech.
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