HVAC in Washington is a mild, damp heating job on the west side and a wider swing inland. Many Sound-side houses were built around a furnace, with cooling treated as optional, so a heat pump talk is really about a long wet season and a handful of hot afternoons. East of the Cascades the heating season stretches, summer heat is serious, and a system that quits in a hard freeze is not a comfort quibble. Filters also matter when smoke sits in a valley, even if the fire is nowhere near the house.
Say what you have now. Gas furnace, heat pump, baseboard, a boiler, wall heaters, or a mix nobody has fully mapped. Say whether the air handler sits in a crawl space, an attic, a closet, or a garage. Those spaces stay damp on the west side and can freeze on the east side. A clogged condensate line and a heat exchanger that worries you are different emergencies. Describe no heat, weak heat, a smell, a noise, or rooms that never match the thermostat.
Ask about the ducts, not just the box that makes air. Leaky ducts in a damp crawl pull that air into the house. A starved return makes a new unit sound busy while the far bedroom stays cold. On the east side, ask how the system handles a hard overnight freeze and a hot afternoon in the same season. On the west side, ask how the house deals with damp air when it is closed up against drizzle for weeks.
Have the town, the symptom, and whether anyone in the house needs reliable heat tonight. If a claim touches a system that failed after a covered event, say that, and have the deductible in mind so the talks do not blur. Do not spend a cold snap hoping the old unit finds a second wind on its own.
The marine damp or the inland freeze will still be there in the morning. Call with the town, where the indoor unit sits, and what the outdoor unit is doing right now. Call the number on this page.