you should look for standing water near the unit of your AC.
it's time to let HVAC technician handle it.
Checking the voltage is not for the inexperienced, so you should call professional.
You should also check if you can hear the compressor..
By connecting multimeter to the You can check the voltage of the contactor-voltage terminals of the coil.
it could mean the thermostat needs to be replaced.
you should know how to operate the thermostat before attempting to repair the unit..
thermostat can cause AC unit to run less efficiently.
You might need to check the control board if the thermostat does not send signal to HVAC unit.
HVAC system is unit and should not be left to DIYer.
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