When I turn my A/C on, the furnace turned on instead.
We changed circuit breakers, thermostats, but still the heat came on instead of the air. The A/C unit was checked out and it was fine
Because we were having a heat wave at that time in NYC, the HVAC tech just disconnected the furnace and said "call me in Sept."
Well its September and I just want to make sure that they don't rip me off and tell me I need a new furnace.
Has anyone any idea why this is happening?

Thank you.