[fastpat]

220 volt house wiring has four wires in it, two 110 volt wires, a neutral wire, and a ground wire which doesn't have insulation on it. Unless your wiring is very old.

I'm surprised your stove and your HVAC system are on the same breaker, that's not in accordance with the National Electric Code, Each leg of the 110 wires should be on a separate breaker, usually about 30 amps each IIRC, but that would depend on the stove manufacturer's requirements for the specific stove. The two breakers are ganged together so that they are shut off at the same time for safety.

The HVAC system should be on it's own breaker(s) completely, if not then I'd suggest that be rectified as soon as possible.