Annual HVAC Maintenance Checklist for Grays Harbor Homeowners

Owning a home in Grays Harbor means your heating and cooling system deals with a lot: months of cold, damp weather, salt air from the coast, pollen-heavy springs, and stretches of summer heat that can catch you off guard. All of that takes a toll on your equipment over time.


An annual maintenance routine helps you stay ahead of problems, keep your energy bills in check, and avoid the kind of mid-season breakdowns that always seem to happen at the worst possible time. This checklist breaks down what to focus on each season so your system stays reliable all year long.

Fall: Prepare Your Heating System

Before Winter Hits

Fall is the most important time to schedule professional maintenance in the Pacific Northwest. Your furnace or heat pump has been sitting idle for months, and you want to catch any issues before you rely on it every day.

A professional fall tune-up

should include:

  • Heat exchanger inspection for cracks or corrosion (this is a safety issue; cracked heat exchangers can leak carbon monoxide)
  • Burner cleaning and flame pattern check
  • Ignition system testing
  • Gas pressure verification
  • Thermostat calibration and testing
  • Electrical connection inspection and tightening
  • Blower motor and belt evaluation
  • Safety control and limit switch testing

What you can

do yourself:

  • Replace your air filter (or check it monthly through winter)
  • Clear anything stored near your furnace or air handler; equipment needs airflow and clearance
  • Test your thermostat by setting it a few degrees above room temperature and confirming the system kicks on
  • Check your carbon monoxide detectors and replace batteries
  • Walk through your home and make sure supply and return registers aren't blocked by furniture or rugs

Fall is also a good time to ask your technician about your system's age and condition. If your equipment is approaching 15 years, it's worth having an honest conversation about how much life it has left and whether repairs still make financial sense.

Winter: Monitor Performance and Protect Your System

Once heating season is underway, your job shifts to keeping an eye on how things are running and catching early warning signs.

Things to watch for:

  • Uneven heating between rooms (could signal duct issues, a failing blower, or balance problems)
  • Unusual noises like banging, whistling, or clicking
  • Frequent cycling on and off
  • A noticeable increase in your energy bill without a change in usage
  • Cold air is coming from the vents when the system should be heating

Ongoing winter tasks:

  • Check your filter monthly; in homes with pets, dust, or heavy use, you may need to replace it every 4 to 6 weeks during winter
  • Keep outdoor heat pump units clear of ice, snow, and debris; don't let vegetation grow up against the unit
  • Make sure your thermostat schedule matches your actual routine; a programmable or smart thermostat can save real money here if it's set up properly

If something feels off, don't wait. Small issues during winter tend to get worse fast when equipment is running hard every day.

Spring: Transition from Heating to Cooling

Spring is your reset window. Heating demand drops off, and you have time to address anything that came up during winter before the cooling season starts.

A professional spring tune-up should include:

  • Evaporator and condenser coil cleaning
  • Refrigerant level check and leak inspection
  • Condensate drain line clearing and treatment
  • Capacitor and contactor testing
  • Fan motor and compressor evaluation
  • Thermostat recalibration for cooling mode
  • Airflow measurement and adjustment

What you can

do yourself:

  • Replace your filter again (starting the cooling season with a clean filter makes a real difference)
  • Clear leaves, dirt, and debris away from your outdoor condenser unit; trim vegetation back at least two feet on all sides
  • Open and check all supply and return registers throughout the house
  • Run your AC for a few minutes to confirm it's cooling before you actually need it on a hot day
  • Clean or dust your return air grilles

Spring is also a good time to think about whether you're happy with your system's performance. If certain rooms were always too cold last winter or your energy bills felt higher than they should have been, mention that to your technician. Sometimes the fix is simpler than you'd expect.

Summer: Keep Cooling Efficiently Through the Warm Months

Pacific Northwest summers are shorter than what most of the country deals with, but when temperatures climb into the eighties, your AC or heat pump earns its keep. Systems that sat idle since last September can struggle if they weren't properly serviced in the spring.

Things to watch for:

  • Weak airflow from vents
  • The system is running constantly without reaching the set temperature
  • Ice forming on the outdoor unit or refrigerant lines
  • Water pooling around your indoor unit (condensate drain issue)
  • Warm air blowing when the system is set to cool

Ongoing summer tasks:

  • Check your filter monthly, especially if windows are open frequently or you have pets
  • Keep the area around your outdoor unit clean and clear
  • Avoid setting your thermostat dramatically lower than the outdoor temperature; a 15 to 20 degree difference is typically the most your system can handle efficiently
  • If you have a programmable thermostat, set it a few degrees higher when you're away rather than shutting the system off completely; this reduces strain on startup

Year-Round Habits That Protect Your Investment

Some maintenance habits aren't tied to a specific season. These are worth building into your routine regardless of the time of year.


Keep a maintenance log. Write down when filters were changed, when professional service was done, and any issues that came up. This history is valuable when making repair-or-replace decisions, and many manufacturers require documented maintenance for warranty coverage.

Don't ignore small changes. A new noise, a slight smell, or a room that suddenly feels different can all be early signs of something developing. Addressing these early is almost always cheaper than waiting.


Know your system's age and warranty status. Most furnaces and AC units last 15 to 20 years with proper care. Heat pumps typically last 10 to 15 years. Knowing where you stand helps you plan financially.


Schedule professional maintenance at least once a year, ideally twice. A fall tune-up for heating and a spring tune-up for cooling covers both sides of your system and gives a technician two chances per year to catch developing issues.

When to Call a Professional

Some tasks are fine for homeowners to handle: filter changes, keeping equipment clear, and monitoring performance. But anything involving electrical components, refrigerant, gas connections, or internal system parts should be left to a trained technician.


Call a professional if you notice:


  • No heat or no cooling when the system is running
  • Burning smells or unusual odors
  • Water is leaking from your indoor unit
  • The system is tripping your electrical breaker repeatedly
  • Ice on your outdoor unit that doesn't clear during a normal defrost cycle
  • Any situation where you're unsure whether the system is operating safely

Hanson Heating & Cooling Is Here to Help

If you're a homeowner in Grays Harbor, Thurston, Mason, or Lewis County and you're looking for a local team to handle your annual HVAC maintenance, Hanson Heating & Cooling has been doing this work since 2018. Our technicians are EPA-certified, and we service all major brands. We're authorized dealers for Trane and Mitsubishi, and installers of Hisense, Daikin, and Bosch systems. 


We offer maintenance plans tailored to your specific equipment and usage, clear pricing with no surprises, and the kind of honest recommendations you'd expect from a local business.


Call: 360-470-3993 Email: info@hansonheatingandcooling.com

by appointment only: 516 W Eaton St, Elma, WA 98541


Hanson Heating & Cooling, Comfort at Every Season.