To compete this project you will need:
Dog house - We were going to build one but we found a Aspenpet dogloo II
dog house at LOWES for $124.98 (1/4/2014). Some quick math showed that we could have built something cheaper with new material but not by much.
5-1/2 inch clamp light - We found this at LOWES too for $6.68 (1/4/2014).
125 Watt Heat Lamp - $3.32 (LOWES - 1/4/2014). They also had 250 watt heat lamps but I was afraid that the wattage would be too high. Also, I'm trying to keep a spot warmer than 20F, not heat the dog house the same temperature as the inside of my house.
RANCO 111000-000 Controller - Wired per this Instrucable
I had published earlier.
Some scrap wood & 4 screws to make a clamp.
I chose screws that are long enough to mount the RANCO controller but short enough to only protrude into the dog house about 1/8 inch. These were left-over mini-blind screws and the tips do not come to a sharp point. If you are using something longer and sharper like sheet rock screws you will need to cut the points off to make them safe for your dogs.