Heat pumps, mini splits and HVAC in Marietta-Alderwood

The housing in Marietta-Alderwood

Marietta-Alderwood is older, modest and close to the water: small mid-century houses along Marine Drive and Lummi Shore Road, a good number of manufactured homes, and pockets of 1940s–60s cottages that predate most of Bellingham’s suburbs. Heat is usually electric — baseboard, wall heaters, or a mid-life electric furnace — with wood as the backup, which is a clean fit for the PSE electric-resistance conversion rebate. Ceilings are low and closets are small, so a wall-mounted ductless head normally beats trying to hide a ducted air handler.

The climate here

The area sits on the Nooksack delta at the edge of Bellingham Bay, so it is mild by the numbers — 19°F from the Bellingham 2 N station — but persistently damp. Marine air and delta fog keep the coil wet through winter, and homes out on Lummi Shore Road see enough salt to justify a corrosion-protected cabinet. Wind off the bay is a placement question here as much as a load question.

Washington's energy code puts Marietta-Alderwood's outdoor heating design temperature at 19°F (taken from the nearest code station, Bellingham 2 N). Bellingham is 19°F and Sea-Tac is 24°F, so equipment picked off a Seattle-area rule of thumb is the wrong equipment for this address.

What makes a Marietta-Alderwood install different

These addresses are unincorporated, so the permit is Whatcom County’s even though the mail says Bellingham; that one catches homeowners out constantly. There is no gas main, which removes the furnace-versus-heat-pump debate and turns the job into an electrical-capacity conversation — older 100-amp services near Marine Drive frequently need work, performed by a licensed electrical contractor. Some parcels sit in the delta floodplain, which sets how high the outdoor unit has to be mounted.

Utilities, and what they mean for your rebate

Marietta-Alderwood is inside Puget Sound Energy's electric territory — PSE serves every address in Whatcom County, which is what puts its heat pump rebates within reach. There is no natural gas service to most of Marietta-Alderwood: None — propane, oil or all-electric. Homes here run on propane, oil, wood or electric resistance heat. If yours has baseboard heaters, wall heaters, an electric furnace or radiant ceiling cable, you are looking at the largest rebate available in this county — $1,500 from PSE, or $2,400 if your household income-qualifies.

Permits in Marietta-Alderwood

Mechanical permits for Marietta-Alderwood go through Whatcom County Planning & Development Services using its Whatcom County Permit Center application, online or in person. We file it under our Washington contractor registration and we meet the inspector. One trap worth naming: plenty of properties with a "Bellingham" mailing address are physically in unincorporated Whatcom County, and the City says so on its own permit page. The parcel decides the jurisdiction.

Nearby

We cover Marietta, Alderwood, Marine Drive, Little Squalicum, Lummi Shore Road, the Northwest Avenue corridor on the same runs. If you are near Marine Drive, the Nooksack River delta, Lummi Shore Road, we know the roads.