Albert wrote in message ...
| I need a bi-metallic switch, automatically resettable that closes
| around 15F. A small inexpensive type, similar to the kind put inside
| nicad battery packs to limit the dissipation of the batteries would be
| ideal.

Search for Klixon:-

Preset temperatures from -65°F to +550°F
Ratings: dry circuit to 15 Amps, 30 VDC or 120 VAC

| What I'm finding when I google is very large and expensive temperature
| controllers that operate from 60F and up.
|
| Anyone know of vendors selling these types of products???
|
| What I want is a simple alarm to warn me when my freezer gets too warm
| to keep the contents frozen.

Look in your local libraries for back copies of electronics magazines.
You'll find simple designs which are better than a snap switch.

NM