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Are you sure that the fans aren't AC powered? Most of these are. Check your service breakers. Flip them off and then back on. And it sounds like you have a small multimeter? Good........you will need that for some testing. As for the A/C.........those are a sealed unit and unless an HVAC guy is willing to add ports and do this, then you will need to buy a new one IF this is the issue. IT might be just a dirty filter OR be sure that the compressor is actually coming on and not just the fan running. Please tell me the make and model of your A/C and what kind of control it has. Ceiling controls or wall mount thermostat. And if a wall mount thermostat, the kind and a description. Analog or digital readout. Brand? Get back to me with this and we can sort these issues out. A phone chat might be best for this sort of thing and save some time. R.J.