cold

Use your arms to represent shivering.
Note: You could sign refrigerator by initializing this sign, but I recommend you just spell "REF."

COLD: (This means "cold temperature." It doesn't mean "to have a head-cold" or to be sick.)

to sign "very cold" use more facial expression, hunch your shoulders more, and move the "shivering of your arms" faster and tighter:

Note: Many people use the sign "COLD" to mean winter. This works well in context but I prefer to initialize the sign "winter" by using a "W" as the handshape.

Here is a sign for refrigerator. I recommend you just spell, R-E-F.
Some people feel that the initialized form of the sign "refrigerator" is signed English. I disagree, but do the sign the way your local instructor wants it just to be safe eh?

You could also initialize the sign for "door" to mean refrigerator.