[strictnein]

Yeah, too many homes were built without fresh air intakes into the HVAC systems. There are definitely reasons you don't want it always pulling in outside air (temp and humidity differences, for example), but it would be nice to have the option to do it once a day just to freshen things up.

[moribvndvs]

They do make HRV and ERV, but not exactly a simple retrofit for existing houses.