Illustration: Aïda Amer/Axios

Washington state's new rules requiring most new buildings to be equipped with heat pumps instead of fossil-fuel-burning furnaces are facing their first major challenge. Heat Pump Water Heaters Prices

What's happening: A coalition that includes several building industry groups filed a lawsuit Tuesday alleging the State Building Code Council overstepped its authority when approving the new energy-efficiency rules.

Why it matters: The move to mostly electric heating and cooling in new buildings is designed to reduce greenhouse gas emissions that drive climate change. But builders argue it will increase housing costs, while making it difficult for homeowners to choose natural gas if they want it.

Catch up quick: Washington was the first state to adopt electric heat pump requirements for new commercial and multifamily buildings, according to E&E News.

What they're saying: "These regulations effectively eliminate natural gas or propane use in the home," the lawsuit says.

Context: In addition to builders, the coalition behind the lawsuit includes a group representing propane suppliers, along with a labor organization representing four construction worker unions.

The other side: A spokesperson with the State Building Code Council said the agency doesn’t comment on pending litigation.

What's next: If the legal challenge is successful, the new building code changes could be put on hold or even rolled back.

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