I was wondering if it would makes sense to control the loop field pump with an external temperature sensor so that the pump would not circuluate when the outside air temp was above (or below) the temperture settings of the house thermostats. E.g. if the AC is set to come on at 78, and the outside air temp is 65 - why have the GT loop pump running?

It seems like a waste of energy to have the loop pump circulating continuously even when there is no chance of the heat or AC coming on inside the house. Has anyone with a GT system tried this? Was it worth the time and expense?

Thanks