Mercer Island's mid-century housing stock is right in the furnace-replacement window — most original-build homes are on their second furnace and facing the third. Heat pumps replace both the aging furnace and the increasingly-needed AC in one project.
The math:
- PSE rebate $1,200 instant — Mercer Island is fully PSE
- Federal IRA tax credit Up to $2,000
- Operating cost savings $500 to $700/yr on typical Mercer Island home
- Marine-grade equipment Specified on every install for salt-air longevity
For a 2,600 sq ft mid-century replacing a 2005 furnace, the 10-year net cost picture favors a heat pump by about $6,000 to $9,000 after rebates, credit, and operating savings — even with the panel upgrade most original homes need.
Salt air from the lake is a factor for outdoor unit longevity. We spec marine-grade fin coatings on all Mercer Island installs.