I wouldn’t- Unless you installed some sort of climate control. I kept an EM out in the garage while I was working on it, but I got super paranoid and removed the backglass. Still couldn’t relax about it and it ended up in the living room until I sold it.
I’d only keep a machine in the garage temporarily if I had no other option.
Fortunately, my wife was cool enough to cave in and allow me to put the machines in the living room, but that limits me to 2 machines, lol.
I plan on getting more, but the problem is I built a soundproof recording studio in a section of the house which would be PERFECT for a bitchin’ collection. Haven’t been playing music as much as I thought I would and I’ve been mulling over nixing the studio and filling the space with machines.
Maybe there’s a spot at your place you could “reallocate” as a man cave or something?