I have a system to duct in, out or recurculate inside air as the seasons change. I can heat my home with 'waste' energy at idle, or switch to cool outside air f

I have a system to duct in, out or recurculate inside air as the seasons change. I can heat my home with 'waste' energy at idle, or switch to cool outside air for heavy jobs or late night gaming. In summer I exhaust outside, pulling cooler air from underground. It is slowly spawning its own system, only 1.5 years in.