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Wood is a great insulator . Your garage floor probably stays in the 70s . You can sketch up a box with a hinged top out of 1” x 8” boards. lowes will cut pieces for you. Use a thinner piece like 1/4” on bottom. Assemble. Store ammo on floor in box. The contents will stabilize some where btwn air temp and floor temp. Even easier might be to use one of those wood cases commie ammo comes in although it might not work as well as a thin bottom box for contact coolness with floor. You can even use some of that thin packing material from staples for added effect over the ammo inside of box though not on bottom.