This is a feeder with heat tape wrapped around it.  The heat tape is secured with electrical tape.  Notice how

the heat tape is wrapped around the ports to help keep them unfrozen.  The water in the feeder will still be cold

but hopefully be kept above freezing.  The ports will probably freeze first when it get cold outside.  Changing

the water can be tricky.  This photo was apparently taken December 10, 2004 in SW Indiana and that is a

female Rufous Hummingbird at the feeder and that is snow in the picture.  I did not rig this particular feeder up

but the one I did looked similar. 

This is a contraption dubbed the "hummingbird haven" by a resourceful guy in Lafayette for their Rufous

Hummingbird in 2002.  It is a plastic storage carton on its side with styrafoam on the bottom and on the sides. 

A hole was placed in the top so a heat lamp could be installed.  Aluminum foil was added at the top apparently

to help keep the heat in.  The hummingbird feeder was set on a food container turned upside down  so that

it would be closer to the heat lamp.

The two photos above show a heat lamp in two different positions.  Essentially it is a heat lamp with a clamp that can the be clamped onto the pole.

If someone is home during the day a combination of heat lamp or changing the feeder every few hours also works.  If the water is

changed frequently then it should be kept at room temperature so that it takes even longer to get to the freezing point.