3 ms·
As far as I know they only put them in the super expensive houses that are made extremely tight. If they use spray foam insulation then there is very little air
by zip1234 6y ago
As far as I know they only put them in the super expensive houses that are made extremely tight. If they use spray foam insulation then there is very little air circulation so that they need to add an ERV just to get enough air to breath.