Solar Hybrid Hot Tub
A free and easy thermal assist from the sun.
Drill
Barrel Water Collector
Make wine into water (sort of).
Lily Pad Pool Warmers
Heat your pool by using hula hoops and the sun.
Homebrew Stir Plate
Magnetic stirring on the cheap!
Heat Exchanger
Create fresh air without the energy loss.
Ball-in-Cage Alarm Switch
Protect your stuff with low-tech charm.
Home Mycology Lab
Use an off-the-shelf home air purifier to
culture and grow mushrooms.