4 ms·Install an air exchanger. Panasonic makes some that are reasonably priced.by colek42 8y agoInstall an air exchanger. Panasonic makes some that are reasonably priced.halbritt 8y agoThey're called energy recovery ventilators or ERVs. The Panasonic units are most well-regarded.graeme 8y agoDo these need to be a whole house system or can they be installed just in one room?