I think a lot of factors probably come into play, like orientation to the sun, how well the garage is insulated, and so on. I looked for a safe for about a year before I settled on a Sturdy Gun Safe, mfg. in CA. I went with the insulated model and installed it this summer and even during the excessive heat with a western facing garage door I did not notice any real high temps within the safe. I did get the dehumidifying rod and tied it into my landscape lighting timer so it doesn't run all day and night. Hope this helps some