You can build a well sized solar air box that will help heat your house for around a hundred dollars or so depending on the materials you have at hand. It's not complicated but you will need basic construction skills and some time to work through the job.
Step 1: Size the Box
The first thing to do is figure out where you want to place the box or boxes you build. I have found out that bigger is better when it comes to solar air heater boxes.
Find the best and biggest not shaded south facing area you can.
Prepare whatever
Find the best and biggest not shaded south facing area you can.
Prepare whatever
