Brian (L) and Jeremy (R) from CDH energy, along with Kapil Varshney (C) from The Levy Partnership install sensors to study our household energy use for the next year. Just humming along, the house was using the equivalent of three 100-watt lightbulbs, CDH said. Data recording unit will gather many points of energy consumption, as well as interior and exterior temperatures.Once a day, the data will be uploaded to a monitoring program via the internet.Temperature monitor for the Fujitsu mini-split heat pump. In our first winter, this provided the only extra heat we needed after the sun and the HRV had warmed the air.Several wireless temperature monitors are placed throughout the house.