Q: We recently installed a new roof, with new fiberglass insulation and two new wind turbines. Would I save money during the winter if I were to cover those turbine vents with plastic?
A: You should certainly not cover the vents, not even during the winter. The attic should always stay ventilated, or it will cost you more money to heat your house. A drafty attic is a good thing, because with no ventilation, moisture will form inside the attic and saturate the insulation. And once the insulation gets wet, it loses its R-value and doesn’t work. If the insulation gets even two percent damp, it loses one-third of its R-value. Those turbine vents actually help keep the insulation dry during winter time, which means your house will stay warmer.