Improving the efficiency of a home built in 1978 during renovations, do I need an HRV?
...air leakage in your home. If you are improving the envelope and making your home more airtight, with luck you will get to the point where you need ventilation system to provide fresh air. But that really depends on how thorough a job you do. What sort of repairs are you doing? Either (or both) of the following pages ma...