It happens every year: the grey skies roll into Snohomish County, the rain starts falling, and suddenly, the temperature drops. Is your furnace ready to handle the shift?

Most homeowners in Washington don’t think about their heating system until the first freezing night—and that is exactly when breakdowns happen. The good news is that a little preventative maintenance now can save you from an expensive emergency repair later.

Here are 5 simple steps to winterize your heating system before the cold sets in.

1 Change Your Air Filter (Do This First!)

This is the easiest and most important step you can take. A clogged air filter restricts airflow, forcing your furnace to work twice as hard to push heat through your home.

• The Risk: Overheating components and higher energy bills.
• The Fix: Check your filter every 30-90 days. If it looks grey and dusty, swap it out. A clean filter improves your indoor air quality and keeps your system efficient.

2 The “Test Run” Strategy

Don’t wait until it’s 30 degrees outside to turn your heat on for the first time. Pick a cool evening this week to do a test run.

• Turn your thermostat to “Heat” and set it 5 degrees higher than the current room temperature.
• Listen: Do you hear banging, rattling, or squealing?
• Smell: A slight “burning dust” smell is normal for the first few minutes, but if it persists, you may have a bigger issue.
• Pro Tip: If the system blows cold air or short-cycles (turns on and off rapidly), you likely need a Heating Repair

3 Clear Your Vents and Registers

Walk through your home and check every supply and return vent. It’s common for furniture, curtains, or rugs to accidentally cover them over the summer. blocked vents create pressure imbalances in your ductwork, which can shorten the lifespan of your blower motor.

• Make sure all curtains are hemmed above the register.
• Move couches or bookshelves at least 6 inches away from vents.

4 Check Your Safety Detectors

In the Pacific Northwest, we button up our homes tightly against the rain. This makes indoor air safety critical. Since your furnace burns fuel to create heat, ensuring your Carbon Monoxide (CO) detectors are working is non-negotiable.

• Test your smoke and CO alarms today.
• Replace batteries if you haven’t done so in the last 6 months.

5 Schedule Your Seasonal Tune-Up

While changing a filter is great DIY maintenance, your furnace has complex internal components—like the heat exchanger, burner assembly, and ignition system—that require a professional eye.

A professional tune-up ensures your system is running safely and efficiently. It’s also often required to keep your manufacturer’s warranty valid.

Don’t get left in the cold this winter. If you noticed strange noises during your test run, or if it’s been over a year since your last service, let us take a look.