HVAC Maintenance Tips for Western Washington Homeowners (Seasonal Guide)

Why HVAC Maintenance Matters in Western Washington

The Pacific Northwest's high humidity and frequent rain create unique challenges for HVAC systems. Mold and mildew can grow in ductwork and on evaporator coils. Heat pumps — the dominant heating system in Snohomish and King County — need regular coil cleaning to maintain efficiency in our mild winters. And our increasingly hot summers (Monroe hit 95°F+ during the 2021 heat dome) mean air conditioning systems that sat idle for years are now being pushed hard.

Spring Checklist (March–May)

1. Replace your air filter. A dirty filter is the single biggest cause of HVAC inefficiency. Replace it every 1–3 months depending on filter type and household (pets, allergies, etc.).

2. Clean the outdoor heat pump/AC unit. Remove leaves, debris, and moss from around the unit. Gently rinse the coils with a garden hose. Keep 2 feet of clearance on all sides.

3. Test your AC before summer. Turn it on in April — before the first heat wave — to make sure it's cooling properly. A refrigerant leak or failed capacitor is much easier to deal with in April than in August.

4. Check condensate drain lines. Clogged condensate drains cause water damage and mold. Pour a cup of diluted bleach down the drain line to clear algae.

Fall Checklist (September–November)

1. Schedule a professional tune-up. Before heating season, have a technician inspect your heat pump or furnace, check refrigerant levels, clean coils, and test safety controls. This is the most important maintenance step of the year.

2. Check and seal ductwork. Leaky ducts can waste 20–30% of your heating energy. Look for disconnected sections or obvious gaps in accessible areas like the crawl space and attic.

3. Test your thermostat. Switch to heating mode and verify the system responds correctly. If you have an older thermostat, consider upgrading to a smart thermostat — it pays for itself in 1–2 heating seasons.

4. Clear debris from the outdoor unit. Fall leaves can block airflow and damage the fan.

Year-Round Tips for Western Washington Homeowners

- Change filters regularly: Every 1–3 months for 1-inch filters, every 6–12 months for 4–5 inch media filters - Keep vents open and unobstructed: Closing vents in unused rooms doesn't save energy — it creates pressure imbalances that stress the system - Listen for unusual sounds: Squealing, grinding, or banging sounds indicate a problem that will get worse if ignored - Monitor your energy bills: A sudden spike in heating or cooling costs often indicates a failing component before any other symptom appears - Keep the area around your outdoor unit clear: Vegetation, fences, and structures within 2 feet restrict airflow and reduce efficiency

When to Call Beaver's Plumbing for HVAC Service

Call us if you notice:

- System not reaching set temperature - Ice forming on the outdoor unit or refrigerant lines - Unusual smells (burning, musty, or sulfur) - Frequent cycling on and off - Water pooling around the indoor unit - Energy bills 20%+ higher than the same period last year

We service all major heat pump, furnace, and air conditioning brands throughout Snohomish County, King County, and surrounding Western Washington communities.