IndyMike, you make some good points. The smaller refrigerator in question is only 4 years old and located in the garage. The only other devices on the 20A circuit are the garage door openers.
Your comments about Insteon and Z Wave devices causing GFCI trips is interesting. I've never had a GFCI breaker trip on another circuit where I have 3 Insteon switches, but maybe I've just been lucky.
I keep thinking it might be time to upgrade the 994i, but honestly, it's been working extremely well for me, so I haven't been motivated to move ahead with the change.
Interesting idea to monitor the refrigerator temperature. I hadn't considered that possibility, so thanks for pointing me in that direction.