What system do I use to circulate air or exchange fresh air in a home?
...ventilation system. That can be either just heat recovery (HRV) or energy recovery (ERV) which also manages moisture. Here is a page that may help -
Choosing between an HRV and ERV, which is best?
if doing a conventional ducted system through your home is too big a cost or hassle (it would be quite disruptive) there ar...