I would like a sanity check on the way a second thermostat controls the blower on my furnace. The set-up is that a second thermostat was installed with a new HVAC system to turn on the furnace blower in order to circulate warmer air from that part of the house for more even heating. The blower does turn on at the set temperature, but the AC unit also comes on which of course results in cold air blowing through the ducts. Is there a way to control the blower operation from a second thermostat without having the AC or heater function kick on or am I asking for something that cannot be done? The quick answer from the intaller was to throw the breaker on the AC circuit, but there is still a "hum" at the outside unit when the 2nd thermostat calls for the blower. Thank you.