One of my dogs cannot be trusted inside while we're away, so add that to the fact that we have no garage or shed, and you can see why I had to come up with something. In this instructable I'll show you how to heat a dog house with a 100 Watt flood light, a paint can, an extension cord, a lamp base, and a few other items you may already have. The current set-up seems to keep an interior temp. of about 60 deg. F. in weather slightly below freezing.

Warning: There is a slight risk of electrical fire if you do this wrong, so be careful and keep an eye on your completed, heated dog house for the first few hours it is in use.

Step 1: Here's What You'll Need

1. A gallon sized paint can clean of all flammable substances or a tin can of equal or larger size.

2. A 100 watt outdoor flood light. Colored bulbs are recommended as they put off equal heat, but less light. In colder climates a ceramic heat bulb might be a good idea, they put off more heat and no light, but proceed with caution as I haven't tested one with this equipment yet. Here's some links so you know what I'm talking about.

What I used:
http://www.amazon.com/Incandescent-Flood-Light-Bulb-Outdoor/dp/B0002AB14M

Ceramic heat lamp:
http://www.petcarebase.com/product/Newtek-Pearlco-Ceramic-Heat-Bulbs-100-Watt-100W-NWBX-Reptile-In.html

3. One ceramic lamp base without a switch

4. 1-Gang Metal Ceiling Electrical Box, the kind that's roughly a 1/2 inch thick
Like this:
http://www.lowes.com/pd_306251-427-VQ295_4294821892_4294937087_?productId=3128527&Ns=p_product_prd_lis_ord_nbr|0||p_product_quantity_sold|1&pl=1&currentURL=%2Fpl_Electrical%2BBox_4294821892_4294937087_%3FNs%3Dp_product_prd_lis_ord_nbr|0||p_product_quantity_sold|1%26page%3D2

5. A wire clamp to secure the wires to the box

6. An outdoor heavy duty extension cord.

7. A drill

8. Hole saw equal or slightly larger than the hole in the electrical box

9. A set of drill bits.

10. A jigsaw

11. Small corner brackets.

12. Screws and nuts the correct size to fit your electrical box and corner brackets.

13. 1/2 inch long wood screws

14. Tarps or old dog food bags made of the same material (optional)

15. insulation capable of withstanding the heat of the light fixture. Radiant barrier car windshield sun screen will do. (optional)

Step 2: Cutting the Hole

1. To start use trace the outer lip of the paint can/tin can with a marker where you would like to mount it.

2. Use your drill and a drill bit larger than the width of your jigsaw blade to drill a hole somewhere along your traced line.

3. Use your jigsaw to cut out the hole along the traced line.

4. File or saw away as much frayed plastic as you can. Frayed plastic catches fire easier than smoothly cut plastic.

Step 3: Building the Light/heater

1. Begin by using your hole saw to cut a hole in the center of bottom of your paint can or tin can. Make sure the hole is as big or bigger then your wire clamp.

2. Aline the 1-Gang Metal Ceiling Electrical Boxes center hole with the hole you drilled in your can by placing the electrical box on the outside of the can.

3. Mark the mounting holes for the electrical box on the outside of the can.

4. Drill the holes to mount your electrical box with a bit of a similar size as the mounting holes in the electrical box.

5. Now place your electrical box inside the can and mount it in place using small bolts and nuts. Lock washers are also a good idea to keep everything secure.

6. Now mount your wire clamp in the larger center hole in the top of your can with the wire clamping part facing out. You can fasten the knobby ring screw from the inside by turning it with a flat-head screwdriver.

7. Now take your short heavy duty extension cord and cut the end opposite from the end that pugs into the wall off.

8. Use your wire strippers to strip each of the wires bare about a half an inch down.

9. String the stripped end of your cord through the wire clamp. Pull the wire out of the open end of the can.

10. Get out your ceramic lamp base. You will see 2 screws on the back of it.

11. Twist the end of your hot wire and bend it into a hook clockwise. Then hook it around the brass screw on the back of the lamp base and tighten it down.

12. Do the same with the white wire mounting it to the silver screw.

13. Loosen one of the screws that holds the electrical box in place and mount the green or bare ground wire around that screw and tighten.

14, Attach the lamp base to the electrical box with the 2 screws included, being careful not to pinch the wires.

Step 4: Mounting the Light/heater

1. Now mount the corner brackets to the outside of the can by drilling holes and securing the brackets with screws and nuts.

2.. Mount the light assembly to the doghouse using short 1/2 inch wood screws through the other sides of the corner brackets.

3. Now screw in your light bulb and pug it in to test.

4. Hopefully it's working. If not, check your light bulb in a fixture that you know to be working. If it's not the bulb, go back to the last step and start over with your wiring.

Step 5: Insulation

This step is optional. But will make your heater much more efficient.

1. using an old windshield sun blocker or whatever form of insulation you choose, cut to size and then wrap around the outside of your light fixture.

2. Secure insulation with duct tape, be sure to wrap the tape in a complete circle all the way around. Duct tape is very sticky, but sticks to itself better than anything.

Step 6: Door

1. Get an old dog food bag made of tarp material or a scrap tarp.

2. (if dog food bag) Turn bag inside out and clean the oiliness from the dog food off with soap and water.

3. Place the clean dog food bag against the opening to the dog house.

4. Drill holes in sets of twos around the lip of the door. 5 sets of two should do.

5. Press the dog food bag around the door opening.

6. Locate the first 2 holes and use a wood screw to poke holes in the dog food bag that align with the holes you drilled.

7. Now string a zip tie through one hole and out the other securing your dog food bag door.

8. repeat until the door is secure all the way around.

9. Now cut a vertical slit down the center of the door flap.

Step 7: Now You're Done

Now you're done.

This dog house heater should help your outside dog through the winter. You will however need to check on your dog regularly and making sure the bulb is still working and the heater is supplying enough heat. It is recommended that you still bring your dog in at night. This heater will probably not help much in high wind or in climates well below freezing.