1. Vent the air in your house into your grow space and then above it outside.I live in michigan where it snows all winter and really cold weather. I read ur supposed to vent fresh air to your room and old air out. How do i vent fresh air if its winter time and I can't pull freezing temps in my room?
It wont work, unless thermostatically controlled exhaust fan. You could buy a plug in one, or wire up a thermostat.What about a backdraft damper?