@patent{noauthor_hybrid_2007,
	title = {Hybrid heating and/or cooling system},
	url = {https://patents.google.com/patent/US20070205298A1/en},
	abstract = {A hybrid heating and/or cooling system may combine different energy sources (e.g., solar and geothermal) into a single system. The hybrid heating and/or cooling system may include one or more heat pumps, a heat exchanger system, a solar and/or waste energy system, and a delivery system for delivering heat (and/or cool air) to a space such as a building. These systems may be interconnected and controlled using various conduits, pumps, valves and controls. The solar energy system may provide heat (e.g., low grade heat) to the working fluid at the input to the source side of the heat pump and/or may provide heat (e.g., high grade heat) to the delivery system for direct solar and/or waste energy heating.},
	urldate = {2017-12-22TZ},
	month = feb,
	year = {2007}
}

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