Green Premiums for installing an air-sourced heat pump in selected U.S. cities City Cost of natural gas & electric A/C Cost of air-sourced heat pump Green premium Providence, RI $12,667 $9,912 -22% Chicago, IL $12,583 $10,527 -16% Houston, TX $11,075 $8,074 -27% Oakland, CA $10,660 $8,240 -23%
