IT WAS 7:45 IN THE MORNING, and five young men stood in a driveway in the Berkeley hills, staring at Michelle Falise’s roof and strategizing.

The crew was with Yellowjacket Heating & Cooling Services Inc., a fledgling HVAC company that specializes in heat pump installations. They were preparing to take on the day’s work in the late fall chill: installing six electric heat pumps in one home, the most they’d ever done on a single structure. It would enable the Falise family to make the switch away from gas to heat and cool their home with added efficiency.

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