my air conditioner just wont work .=(
sometimes the easiest thing to check first is if the thermostat has batteries to check/replace the batteries
Better yet, grab a fluke meter to see if 220 is there,
furnaces run on 120 volts not 220 volt
most homeowwners do not own a meter for testing voltage
or know how to use it
if there's no current, check the breaker.
or just check the breaker first because most homeowners do not own a test meter
They call your style of operation "A##%$ Backward."
the batteries in the thermostat are more likely to run out of a charge before your situtation would present itself especially if the thermostat operates the furnace and the air conditioning functions
but you knew all that...