It depends
Entirely on where you live, the light you install and how it is installed. I have several and live in Arizona. I LOVE the light. I prefer to work under natural light. Mine have been great and I haven't had an issue with heat or cold (or rain) getting in. It tend to rain here all at once. As in over 3 days we get the years supply of rain.
Get several estimates, research them to get the one with the best rating. Then enjoy the light!