[Byte1]

Yes, some garage doors can be stopped leaving a small opening. Some have already given their suggestions in that regard. The garage opening screen works very well for some ventilation and privacy, but the air is not going to be any cooler than it is outside. I had a screen and enjoyed working in the garage without passing by neighbors stopping to chat when I was busy. I try never to leave my garage door open very long because I have seen snakes and lizards, as well as wasps enter while I had it open. Last year, I finally installed foam insulation on the doors and it is better than I imagined. Before, if I brushed up against the garage door while the sun was shining on it, it would actually burn my elbow/arm. Now the garage is cooler in the summer and warmer in the winter. I have not yet seen the necessity of installing a split unit in my garage, but that is easy to do also, and have been in garages with them and they are nice. If I was going to spend a lot of time in my garage, I would consider a split unit A/C.