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Cold weather can cause older incandescent Christmas lights to fail by causing cracks in the finish or the glass itself. Modern LED lights are affected in the opposite way and perform even better as the temperature drops. 

No, you should not leave LED Christmas lights up all year. While the LED lights themselves are very durable, their wiring and casings can be as vulnerable as any Christmas lights. They’re subject to drying out, experiencing cold or sun damage that causes them to crack, and even damage caused by gnawing pests. (The same is true of incandescents.) If you want your lights to last the years that they’re rated for, bring them inside after Christmas is over. 

To hang Christmas lights on a ceiling without using nails or traditional hooks, you have several damage-free options. Adhesive hooks and clips are a popular choice. For smaller projects, you can use pushpins, tacks, or adhesive putty. Specially designed transparent tape that can hold weight without damaging paint is also effective. For a more creative approach, consider stringing the lights over a curtain rod near the ceiling. If you have a drop ceiling, look for clips and hooks designed to attach to the metal framing. Note that staples can also be used, but may leave small holes.

Repairing a strand of Christmas lights will save you a few dollars and the hassle of going to the store to purchase new ones. That may or may not be enough to make fixing them worth it to you. However, if the lights are already hanging or around the tree, removing and replacing them is far more time-consuming than performing a quick repair job.