i have a 3 car garage. As i workout, the garage heats up from me, my electronics (tv, amplifier, speakers, etc.), and the trainer heat. It also gets more humid, from my sweat. In a 2 car or 1 car garage, it would be a very noticeable rise.
Something to consider. I also turn off the fans if it dips that low. I may turn a fan on, indirectly to circulate air around, but not on me, just around the garage. Sometimes I crack the garage door, or open one of the inner or outer doors to get more air in.
I’ve never worn anything other than bib shorts, and only put on a jersey when it’s below 50F. With no fan on me, and only slow moving air, and the body heat, don’t need it.