Electric heat pumps, the most affordable and energy efficient way to heat and cool homes, continue to outsell gas furnaces nationwide. They can also reduce outdoor pollution and, as a result, save lives, according to a report issued on Tuesday.

The study, by Rewiring America, a nonprofit group that promotes electrification, calculated that if every American household got rid of furnaces, hot water heaters and clothes dryers powered by oil or gas and replaced them with heat pumps and electric appliances, annual greenhouse gas emissions could drop by about 400 million metric tons. Fine airborne particulate matter and other air pollutants could decrease by 300,000 tons, the equivalent of taking 40 million cars off the road.

Roughly two-thirds of the country’s households burn fossil fuels such as natural gas, propane and fuel oil for heat, hot water and drying clothes, releasing nitrogen oxides and other pollutants into the air.

While a transition to electric appliances could shave $60 billion off people’s annual energy bills, it could also deliver important health rewards, researchers found. It could prevent 3,400 fewer premature deaths per year, 1,300 fewer hospital visits and 220,000 fewer asthma attacks, all of which amounted to about $40 billion in benefits, according to the study.

“Just swapping out appliances, it’s eye-opening in terms of the significant impacts,” said Wael Kanj, senior research associate with Rewiring America and the lead author on the report.

The amount of pollution reduction would depend on whether the electricity needed was generated by low-carbon sources like wind and solar power or came from gas or coal-fired power plants.

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