Hi! So, it's the fan running you are hearing?
Check and make sure your fan opening isn't blocked (my fan motor got loud one time and it was just the teeny opening was blocked with dust --- go figure, dust in my house)
None of my electronic thermostats or elements make any sound at all.
I can't imagine that a Hovabator is that much different (except slightly shape styrofoam) from Little Giant.
Lisa
Check and make sure your fan opening isn't blocked (my fan motor got loud one time and it was just the teeny opening was blocked with dust --- go figure, dust in my house)
None of my electronic thermostats or elements make any sound at all.
I can't imagine that a Hovabator is that much different (except slightly shape styrofoam) from Little Giant.

Lisa