Since building my observatory and never wanting to have dew or moisture around the optics. With a belief that a little gentle heat is a good thing (no idea if that's true)
I Leave my dew heater on all the time doesn't matter when or the season its always on - medium to low setting. I have never had dew on the optics and it doesn't seem to cause any issues.
Anyone else leave the dew heaters on?
How long can you expect a dew heater to last?
I am guessing the dew heater power supply might go first, really no idea.