I am building an incubator for elementary kids to hatch chicken eggs. Part
of the challenge is to use only free, recovered items So far all items have
been free:
- Omaha Steaks shipping box
- plexiglass from discarded poster frame
- electric cord with plug
- light socket- computer cooling fan with wall wart (for circulation)
- wire mesh.

Only items I'm missing are thermostat and thermometer. I know that many
household appliances contain temperature regulation devices such as
thermostats, thermal switches and thermistors. Some appliances and systems
even have temp control circuits with digital readout.

My challenge is to find something that will hold temp at about 100°F (38°C)
and run on 120Vac. Clothes dryer? Oven? Iron? TV?