I built a well insulated 9'x12' shed in my backyard to use as a workshop and for growing sprouts and seedlings. I installed a Cyclone Dual Air Single Room High

I built a well insulated 9'x12' shed in my backyard to use as a workshop and for growing sprouts and seedlings. I installed a Cyclone Dual Air Single Room High-Efficiency Energy Recovery Ventilator from Home Depot. That unit was about $1000. It works quite well and my shed is super comfortable to work in year round. I installed a larger ERV (about $2000) that is tied into our house central air. It has been a huge improvement to the comfort in the house.