I have a Trane GSUJ geothermal unit. During winter I supplement the heat in the house with a woodburning stove. I would like to circulate the hot air to colder areas via selected returns. With the compressor not running due to the heat in the thermostat area being high, the fan runs on low speed and does not get the job done. How else can the fan speed be increased? NOTE: The fan does run on high speed when the compressor runs.
