Well, summer is coming again and my electric bill is already unacceptable. $218 last month just for a single mobil home. Last year at this time, we had the same usage but the bill was $150. I don't know about ya'll but I can't afford my projection for my summer electric bill. So... Last year I found a website and someone there suggested taking thinwall PVC, burying it 2' or 3' deep in the ground and pumping air through this into the house. I came across another website that actually had prints for this. The PVC needed to be anywhere from 4" to 6" and it would cost about $900 or more just for the PVC. I compared this with aluminum piping and steel and with the pipe joints, dope and a strong coating to resist corrosion, it would cost well over $3000 for the cheapest option. I'm thinking for my 16'x80', I may be able to do this for less than $2200. That means that at the present cost of energy (which is going to go up), the thing would pay for itself in two years because the in hottest months, most of the bill is for air conditioning. Without it, my house easily reaches 95 F inside. It's very inefficient. I am making plans to do some things to make it more efficient but I think in the long run, traditional heating and cooling is out. Has anyone considered this or had any ideas along these lines? How would you build your (air) pump station? Would you build a box with fans in it or maybe try to get some inline fans? Any ideas are welcome.