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Pilot light: HDFC co-op pioneers a new strategy for air-source heat pumps

Inside the pilot program that helped this LMI Manhattan co-op lean less heavily on #2 heating oil

Sealing in the benefits of energy efficiency

Project designers explain why air sealing is a crucial compo­nent of any energy effi­ciency project

Controlling for comfort — and for cost

New air-source heat pumps offer resi­dents an increased level of control, but also shift who’s paying for the heat

Tips from Tom Sahagian

An energy aficionado offers advice on how to make the switch to more renew­able technology