Want a deal on a heat pump? Team up with your neighbors.

Last year, Marie Tai needed a better way to keep her condo cool. Her window air-conditioning units were borderline ineffective, even running at full blast. Summers have been getting more intense in Tai’s Boston neighborhood because of a rapidly warming climate, and she had just adopted a 16-year-old cat named Mittens, who was still recovering from being hit by a car. Tai had already been considering a heat pump, an all-electric appliance that heats and cools spaces and lets homeowners ditch polluting fossil fuels. But three contractors had quoted her prices ranging from about $28,000 to $40,000. Tai, who heads finance and administration at Harvard University’s Project Zero, thought those estimates seemed excessive for her 1,000-square-foot, two-bedroom place. So she had hit pause on the project. But with Mittens’ well-being front of mind, Tai renewed her heat pump search last spring. Through Facebook, she found an opportunity to participate in a program that aggregates demand, organized by Laminar Collective, a local startup that does research on the tech and coordinates installations. These heat pump group-buy initiatives let installers purchase equipment in bulk and spend less time chasing leads, accruing savings that they can pass on to customers. Tai, tantalized by Laminar’s menu of low prices for a heat-pump setup, decided to give it a shot. Read Next American homes need heat pumps, not space heaters Matt Simon After a representative from the startup visited her home to check what heat pump size and configuration would fit her needs, Tai signed up for a ductless minisplit system for $20,000 — thousands less than even her lowest initial quote. She then also took advantage of an additional $8,500 state rebate and eight-year financing with 0% interest. The new equipment has been life-changing, Tai said. She no longer has to buy fuel oil for heating in the winter, and the heat pump is so efficient that last year she saved roughly $1,300 on her energy bills. In cont