There’s a dilemma that homes face when it comes to receiving fresh air while staying warm during the winter. Modern homes are built to trap heat indoors and make them easier to keep comfortable. If cold drafts are getting into a home, it will be much harder to keep warm and the heater will have to run almost constantly.
But this heavy insulation on the house also means there’s little chance to vent out the stale, often contaminant-filled air and replace it with fresh air.