Mmanufacturer of air-to-water heat pumps called asking if I would be willing to visit a home to perform a heat loss/gain calculation where two of its heat pump systems had been installed and determine why the home was not heating and cooling to the homeowners satisfaction. The icing on the cake was the home was quite close to West Chester, Pennsylvania, where our younger son lived at the time. He belonged to a sporting clay gun club, and if I timed my visit correctly, we would be able to meet there after he finished work.
Upon arrival, the homeowner met me and laid out the heating/cooling/DHW issues: