I have a regular furnace without a HVAC setup. When it's summer we usually have the fan running constantly. The furnace fan then runs at about half the speed as it would when the heat is one.
Recently I was at a friends house with a similar furnace and thermostat. When he sets his thermostat to cooling mode it would once in a while kick on the furnace fan at full speed without igniting the burners, thus pulling in cooler air from the basement.
Would this be a feature from the furnace or thermostat? Do I have to wire the thermostat in a certain way?
Best Answer
The common relatively (30 years old or newer)newer furnace have blowers with multi speed taps on the motor. If it is a variable speed furnace it has dip switches. Typically the higher speed is for cooling and the lower speed is for heating. Most furnaces go to the high speed for fan only operation, yours apparently goes to a lower speed. Without knowing the model number it is difficult to tell you exactly how to wire it. It may be as simple as changing the speed taps on your blower or as complicated as hooking an extra wire to the Y terminals of the circuit board and thermostat and tricking the furnace into thinking it is cooling.