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The Paris Climate Accord is an international agreement among nearly 200 parties that “brings all nations into a common cause to undertake ambitious efforts to combat climate change and adapt to its effects.”
The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) is the trade association representing manufacturers of air conditioning, heating, and commercial refrigeration, and water heating equipment.
In April 2010, the U.S. Department of Energy issued new efficiency standards for residential storage water heaters — gas-fired, oil-fired and electric — and gas-fired tankless water heaters. These efficiency standards become effective in April 2015.