Cold shop temps messed up my paint blend last week

I was finishing up a sedan repaint last Thursday when the temperature decided to plunge. My shop's heating is basically a joke, so I figured it would be fine. Mixed the base coat like always and got to spraying. Midway, the color went all blotchy and patchy. Had to stop, sand everything off, and wait for the place to heat up before restarting. Turns out the reducer just doesn't play nice in the cold. Now I crank a space heater to keep things above 60 before I even look at paint. Anyone else dealt with this? Save yourself the headache.