Easily Build Your Own Solar Room Furnace

Energy from the sun is clean, free, and in some cases, reliable. You can harness the power of free solar energy to heat a room in your home with a DIY Solar Furnace. The materials used here can be found at the local scrapyard, or a hardware store and should not cost more than $50.

Needed supplies:

  • 1 3 x 5 ft. black plastic
  • 4 Thin glass windows with a frame
  • 24 ½-in bolts
  • 2 Angled ABS plastic joint
  • 2-4 Cinder blocks
  • Great Stuff insulating foam
  • 2 PVC pipes
  • 1 Dryer hose
  • Fishing line
  • Staples
  • 1 can of black spray paint
  • 2 2-ft. pieces of lumber
  • 2 6-ft. pieces of lumber
  • 1 piece of plywood the size of the window you’re putting it in.
  • Drill


  1. Build the frame by attaching the 2 x 6 ft. lumber with the bolts. (Two in each corner)
  2. Set the glass on top of the frame. Use a single bolt per corner to secure the windows to the frame.
  3. Level the unit the same height as your window, outside your house using cinder blocks.
  4. Drill a hole in the top of the frame and mount one of the angled ABS plastic joints for the exhaust.
  5. Feed the PVC pipe from the furnace into your window, like an exhaust.
  6. Fit the dryer hose inside the frame like a coil, so it feels up the whole space inside. Fishing line and staples can be used to fit the coil to the entire inside space.
  7. Spray a light coat of black spray paint onto the aluminum to attract more rays.
  8. Install the window panes on the front on the unit.
  9. Drill holes into the smaller window frame-sized plywood and then into the frame. There will be one for the exhaust and one for the intake.
  10. Connect the intake and exhaust piping to the room. Use insulating foam, such as Great Stuff, to seal and permanently attach the piping.

Should you need more help, this video should give an example of what this will look like.

More Uses For Solar Energy

Using solar energy to heat your home is a great way to save money, or even start your journey to energy independence. Solar energy can also be used to keep your perishables frozen, power your critical means of communication during a disaster, and much more. Click here to learn more.