Keywords: New heat pump water heater that works much like a window air conditioner.jpg Oak Ridge National Lab ORNL Here technician Phil Childs uses a multimeter to check connections in one of the heaters as it is being in- stalled in ORNL's energy conservation lab During the next year or so 100 of the units will be tested in homes of U S http //www bestheating de Best heating An Energy Department Photo 2014-07-01 https //www flickr com/photos/departmentofenergy/14366248777/ ENERGY GOV other versions PD-USGov United States Department of Energy Fan coil units |