I did a lot of research and found something called the Hound Heater Dog House Furnace while looking around online. I read a few reviews and decided to order a couple and give them a try. They were very easy to install, just drill a hole for the cord and then mount the unit with screws, and easy to set a temperature on. I would advice to follow the instructions and have the cord piped out the back of the unit, this way it comes out of the dog house without any cord showing inside, this eliminates any chewing issues. The unit has a thermostat on the side that you can set to a comfortable temperature.
So how well do they work? Well when I left this morning it was -11F with a wind chill around -25F to -30F, if I open my houses up, there is a significant difference in temperature. So my Wirehaired Pointing Griffon Puppies are nice and warm. Since this is a radiated heat, not something blown in, you want to try to insulate your boxes the best you can. The better the insulation, the better the heat. If you live in a cold weather state, or even a area where you might want to spoil your furry friends, then I would highly suggest this unit. I have included some of the Dimensions and Installation Instructions below to give you a idea of what it takes to put one of these in.
Dimensions: approx. 10"L x 10"W x 5 1/4"D
Tools Required: You will need a measuring device, drill, 1 1/8" wood bit, screw driver and six wood screws (not included).
Step 1 -- Tape the Hound Heater mounting template in any corner of the dog house. We suggest mounting it away from the entrance.
Step 2 -- Place the bit in the center of the template's black circle.
Step 3 -- Drill a hole all the way through the wall.
Step 4 -- Carefully feed the cord all the way through the previously drilled hole making sure the cord is not kinked.
Step 5 -- Mount the Hound Heater in an upright position using four sturdy wood screws. The "C" on "Caution Hot" is the top of the unit.
Step 6 -- Mount the Hound Heater Heat Shield about 2 inches above the top of the Hound Heater. The purpose of the shield is to deflect the rising heat and disperse it more efficiently in your pet's house. It will also protect the ceiling from getting too warm.
Step 7 -- Set the thermostat to the desired temperature for your pet.
Step 8 -- Plug the unit into a GFI outlet.