Issaquah is a tale of two housing markets: pre-1990 downtown homes that need full electrical upgrades to support a heat pump, and post-1995 plateau/Highlands homes that drop a heat pump in cleanly.
The math:
- PSE rebate $1,200 instant — Issaquah is fully PSE
- Federal IRA tax credit Up to $2,000
- Operating cost savings $400 to $600/yr vs gas (PSE rates)
- AC included Critical for west-facing Highlands homes
For a 2,400 sq ft Issaquah Highlands subdivision replacing a 2001 gas furnace, the 10-year net cost picture favors a heat pump by about $4,500 to $7,500. For a downtown 1975 ranch, the heat pump pencil widens once you factor the panel upgrade is needed regardless for any future electrification.
Issaquah is more wind-exposed than central Seattle, so backup generator pairing comes up more often. We bundle the electrical scope.