A builder friend of mine is looking for the following: “A heat recovery system that could go full flow with no recovery to very minimal flow with full recovery. I would want the full flow to give us enough air to be a real significance in the house so that we could actually do some natural heating and cooling.”
Do any makes or models excel at this? I think the idea is that he wants to do complete nighttime exchanges relatively quickly using the filters in areas where opening the windows to accomplish that might not be the best idea, either for pollution or other reason. Thanks for any ideas.