Grow your own hops, use the portable heater you already own to make a device to dry them for storage. Then make beer?

Making the beer into lager requires lower fermentation temperatures. Make a temperature control system with the refrigerator you already own, and keep your beer a consistent, but cool fermentation temp!

Inexpensive Home Heating. Use the PhotonHome, a temperature sensor, and a space heater to keep a room at a consistent temperature.