|
|
|
|
|
|
by benlivengood
69 days ago
|
|
|
Heat recovery ventilation systems exchange inside air for outside air through an air to air heat exchanger (modern energy-efficient houses are built too tight for natural air exchange). If you make the incoming outdoor air an even 50°F (except when the outdoor temperature is between about 50° and 70°) then you spend less on heating and cooling. |
|
|