Paul Doppel, senior director, industry and government relations at Mitsubishi Electric Cooling& Heating, provided commentary to ACH&R News about the top regulatory challenges facing the HVACR industry in 2016. He notes the main challenges will be the U.S. Department of Energy's supplemental notice of proposed rulemaking [SNOPR] on the test procedures for central air conditioners and heat pumps, as well as the possible replacement of R-410A with R-32 or other A2L-classified refrigerant.