We have installed recorders in nema boxes outside in the sun. Usually the box will have fans in the bottom to keep air flowing. They can last a couple of years if its done right. We just replaced a processor fan in a CVI recorder that was installed in an office above the drop ceiling, where it was hot most of the day. I think that recorder was about a year and a half old. For a home install, where you have a choice, mount your equipment in the A/C. if its in the garage, buy a little fan to blow on it.