I live in the Phoenix area and just purchased a K40 laser. Currently I have it inside the house but would like to move it out to the garage. With the Summer coming around the corner I was wondering if it would be OK to have the laser in the garage where temp reach up to 120 degrees Fahrenheit.
20degrees f is below freezing. What temp did you mean to type? 
Sorry 120 degrees
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That makes more sense. It will be OK to store it in that heat, but be careful when running it, you do not want to run cold water through the hot tube, it might crack from thermal shock. It would be better if you could keep it in the house, less wear and tear on the machine if the temps stay more regulated.