How To Make A Hummingbird Feeder Heater. During the cold snap, a half dozen anna's hummingbirds fed here day and night. Blog post about heating hummingbird nectar for wintering hummingbirds in seattle and the pacific northwest.
Many bird shops sell heated hummingbirds feeders. Includes photo of a setup with a lamp heating a hummingbird feeder on a rainy day in the city. Fast and friendly winter hummingbird feeder: