Anyone’s garage actually cool enough to use?

I'm trying to cool off my garage just enough that I can actually use it during the day. Does anyone have success using a portable AC unit in their garage? Maybe other cooling strategies? Unfortunately, I'm not able to seal off and insulate the garage like would be necessary to get a properly cool space. I'm not expecting it to be cold in there, just don't want to be pouring sweat the instant I start working… Ideas, tips?