05/18/2026
I want to share something I found on a recent inspection β because it's the kind of thing that reminds me exactly why I do this work.
During a home inspection in the Greater Seattle area, I traced the furnace intake and found it was pulling air directly from the crawlspace. Not recirculating the indoor air the way it's supposed to β pulling from underneath the house.
Here's why that's a serious problem.
Your furnace return system is designed to draw conditioned air from inside your home, heat it, and redistribute it through your vents. When the intake is connected to the crawlspace instead, everything living in that crawlspace gets pulled into your heating system and pushed into every room every time the furnace runs.
What's in a typical Pacific Northwest crawlspace? Moisture is almost always present β our climate practically guarantees it. Where there's persistent moisture, mold follows. Crawlspaces in the Seattle area also commonly contain rodent activity, pest debris, soil gases, and in older homes, materials that were standard at the time but aren't something you want circulating through your air supply. None of that belongs in your lungs, and none of it announces itself. You don't necessarily smell it. You don't see it. But if the furnace is pulling from the crawlspace, it's in your air.
Is furnace air intake from a crawlspace dangerous? Yes β it's an installation defect, and it creates genuine indoor air quality risks that can affect respiratory health over time, particularly for children, elderly residents, and anyone with asthma or allergies.
This is exactly the kind of defect that a visual walkthrough won't catch. It requires someone who knows where to look, what to trace, and what the system is supposed to look like when it's working correctly.
So here's my message to every buyer in this market: get a home inspection. I know the Greater Seattle market has pushed a lot of buyers to waive inspections just to compete. I understand that pressure. But if you waive it to win the offer, hire an inspector the day you close β not to reopen negotiations, not to create drama, just to know what you're living with. Because what you don't know can absolutely hurt you.
A home inspection in the Shoreline, Kenmore, Bothell, and Ballard areas typically runs $400β$600. That's a small number against the cost of a mold remediation, a medical issue that traces back to air quality, or a furnace repair you didn't know was coming.
I'm Alyson β a licensed real estate agent and certified home inspector serving the Greater Seattle area. My job is to make sure you not only get into a home, but that you're safe in it.
π I'd love to hear from you β have you ever had a home inspection uncover something that genuinely surprised you? Share it below. These stories matter and they help other buyers know what to watch for.
π¬ Or drop ASSETNINJA in the comments to connect with me directly.