We've got a central cooling air conditioner that was installed in 1984 with a thermostat from that same year. We are replacing the thermostat with a new programmable one (which has a 100% compatibility guarantee).
Following the instructions from Home Depot I located the circuit breakers for the unit and switched them off (the circuit breakers on the panel inside the house, not the main ones for the entire house). Nothing happened. The AC unit is still running and blowing cold air.
Am I missing something here or could the breakers be broken? Or worse, could the unit be installed improperly? Feel free to point out the obvious. :-)
More info if it matters: We have a Trane central air unit with a heater pump and an emergency electric heater. We are in Central Florida