I’m getting ready to build a 4x4x8 ft in my garage. I live in the Midwest where temps get high in the summer, and low in the winter. My question is when building this do I need to make room for a portable A/C unit and or Heater with vents at the bottom of the room and exhaust out the top? Or should I enclose the room filling and pull fresh air to the room from the house? My concern is the air in the garage will be to hot/cold for the grow room, and with the vents at the bottom bringing in the air, it will make it difficult to control the temp in that space.