You can also get thermal cubes from Home Depot or other hardware store that activate about 35 degrees and shut off a bit higher.
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> On Dec 4, 2016, at 10:15 AM, Subscribe NVBIRDS anonymous <[log in to unmask]> wrote:
> I have one male Anna's Hummingbird in my yard which seems to have settled in for the winter. I purchased 2 Hummer's Heated Delight heated feeders from an internet vendor last winter and they work very well. On a dusk to dawn timer they never froze.