Thanks nodog, tried that but it shuts A/C off entirely - some kind of short protection maybe. The controls are solid-state, the A/C came from Sam's Wholesale, a 12.5k BTU.

If I could get the thermo bypassed where the compressor runs constantly, I'll put a 110 volt electrical thermo between the wall plug and the A/C and set to about 40 or 42 maybe. I just need this thing to work for a maybe 4 weeks total during the season.