I call BS as well... IF as previously mentioned that the circuit breaker was tripping. Batteries in the thermostat??? Cmon, first of all the thermostat is part of the low voltage (24volt) circuitry, not the line voltage (240v for condesor or 120v for furnace).
If you cant/didn't figure out the problem on your own, don't be ashamed. We get calls all the time from doctors, lawyers, engineers etc.... They just don't have the tools we do, nor the knowledge or access to parts.
If the circuit breaker is tripping rather quickly, its most likely a short to ground, either from the compressor, the fan motor, or even just in the wiring (in the walls, or the unit). Just call a few local companies and if you have any further questions shoot me a PM.
Glock 19 & 26
HK USP Elite .45
Rem 700 SPS Varmint .308
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