HVAC in Federal Way

Split-levels in Twin Lakes and Adelaide — Federal Way's core residential neighborhoods along 98023 — were built in the mid-1970s around gas furnaces that made sense when gas cost almost nothing. Most of those systems are still running. A Mitsubishi Electric heat pump swap today qualifies for up to $2,000 in Inflation Reduction Act rebates, plus potential utility incentives through Puget Sound Energy. The math has flipped — electric is now cheaper to operate in most of these homes. Call (206) 591-1096 to talk through what the numbers look like for your specific system before committing to anything.

Federal Way's stock runs from 1970s split-levels in Twin Lakes (98023) to 1980s ranchers near Steel Lake and Mirror Lake, plus 1990s tract construction out toward West Campus and Pacific Highway S. Ductwork in the 1975-1995 build era was installed for gas airflow temperatures — not what a modern heat pump delivers. Add the marine climate pushing damp air through crawlspaces from October through April, and duct liner deterioration in unconditioned spaces accelerates faster than homeowners expect. Crawlspace vapor barriers in homes near Steel Lake are frequently undersized or improperly lapped — unsealed seams let ground moisture into the duct system year-round, degrading flex duct liner from the inside. Federal Way's 98003 zip sees the same pattern in 1990s construction: builder-grade flex duct stapled loosely, insulation that has settled away from the liner, and return air paths that were never designed for balanced pressure.