What is attic ventilation? Your attic’s ventilation is a system that allows your house to breathe. It works by pulling fresh air through your attic and allowing the heat to escape through your vents properly. There are 2 types of attic ventilation systems: active and passive.

Is attic vent necessary?

In the summer, good attic ventilation reduces heat buildup. That cuts cooling costs and prolongs shingle life. In the winter, warm, moist air seeps into the attic from the living space below. … If you don’t see any attic vents on the roof or in the eaves, you need to add some.

Should attic vents be open or closed?

You should absolutely leave your roof vents open during the winter – do not cover them! During the winter, roof ventilation works to keep temperatures even. Closing your vents makes the attic space too warm and dry – dangerous conditions for mold as well as pests.