I think 50° Is the safest and that’s pretty cold. The worst thing is temperature SWINGS for pins. If it goes from 50° to 80° to 50° in 6 hours, the pins are gonna have a terrible time. If it goes from 50° to 60° in 12 hours that’s fine. Slow, gradual temperature changes are best for a pin. I wouldn’t recommend playing them when it’s below 50°

I have a Fishtales at my cabin. I do not heat the cabin in the winter. It gets below zero many times. It has a translight, so no worries of paint peel on glass. I do remove the batteries, and it doesn’t get played all winter. I do not think there is any sudden temperature swings inside the cabin as it has some insulation. This pin has been there for 8 years with no problems so far...

I would worry about humidity.

I have had games in storage that was not climate controlled with extreme heat and cold with no damage. I would not suggest to do this for many years but a year or two should not cause any issues.

Temp swings are the worst. Drove three hours each way to look at a STTNG once. Guy had it on his enclosed, unheated porch, where he ran a kerosene space heater whenever he went out there to smoke in the winter. Every bit of chrome on the poor thing was rusty. PASS!

I successfully played a MM for 10 minutes in a garage that measured just under -40°F. That was about 10 years ago and still have the machine and works great as always. I would strongly discourage this for many reasons.

As others have said the changes are usually bad news. A recent wedgehead I just picked up was cold storage last year for a year and got lucky things were ok especially the Backglass. Usual flaking on the title wasn’t too bad still.

Spot on. The greatest cause of back glass flaking is temperature swings over time, sped up by frequency and degree differentials. The ink and the glass are completely different materials so they expand and contract at what can be very different rates (simple physics). This leads to eventual separation of the two surfaces/layers.

Backglasses on EMs, and of course newer games that have them, would probably never flake but for such abuse.

I have kept backglasses separate from any games subjected to such extreme temperatures here in chilly Wisconsin, which is Chippewa for "you'll freeze your ass off." That paint is not going to put up with the glass expansion difference. Backglasses don't take up much room compared to the entire games, so it's silly not to.

Keep my project em's cabinets in an unheated shed, but the heads go into the heated basement. No issues so far....