The new Ultra Solar Collector solar pool heater has become even more efficient and it's on clearance!
How to Build a Easy DIY Solar Pool Heater. All you need is 4 two foot lengths of pvc, 4 90 degree pvc elbows, foam pipe insulation, duct tape, 6 mil black plastic and some wire ties. The project takes less than one hour. This design works great for above and in ground swimming pools. http://www.diyeasycrafts.com/
Backyard pools are lots of fun, but cold weather can keep you from enjoying them year round. Pool heaters are great, but can get expensive to purchase and use. Why not build your own and use it for free by harnessing the free energy in the sun?
If I had a pool, or a beach house and a random extra door hanging around, I'd totally do this.I would use a screen door so air could circulate. Place hangers on wooden part of screen door. I happen to have several spare doors, but no pool