I't not even just the hear/cooling, but the rain & snow blowing in & a PITA if the power is out.
Some years ago I was a sales rep & called on car dealers, garages, auto body shops, etc. Some of the small shops - I remember one even in a converted row house - had them. Didn't think this would be such a weird item to find, so maybe those guys just customized them themselves.
We were able to find a price on a combination garage door with entry door. It was through oue local Overhead Door Company, but you need to talk to the comercial folks, not the residential ones. We did not go that route because a standard size door was about $3,000.