Puget Sound Homeowner Guide
The most common heating, AC, plumbing & electrical problems in Seattle-area homes
Our marine climate, older housing stock, and winter windstorms give Puget Sound homes a distinct set of issues. Here's what we see most across heating, cooling, plumbing, and electrical — why it happens here, and how to fix it.
Heating
Our long, damp, mild-but-relentless heating season runs systems hard from October through April — and a lot of Puget Sound furnaces are well past their prime.
The furnace short-cycles (turns on and off too often)
Why it's common here: A long heating season exposes an oversized furnace or a clogged filter fast — the unit satisfies the thermostat too quickly, then restarts, wearing out parts.
What to do: Change the filter first, then have the sizing, flame sensor, and airflow checked.
No heat on the coldest morning of the year
Why it's common here: Aging furnaces and heat pumps tend to fail exactly when worked hardest — during our cold snaps.
What to do: Book a fall tune-up; if the system is 15+ years old, plan replacement before winter rather than during it.
Heat pump ices up or runs expensive backup heat
Why it's common here: Damp PNW cold frosts the outdoor coil; a stuck defrost cycle or low refrigerant forces the system onto pricey electric resistance heat.
What to do: Keep the outdoor unit clear of leaves and moss, and have defrost operation and charge verified.
Some rooms never get warm
Why it's common here: Older homes with a single zone, leaky crawlspace or attic ducts, and thin insulation lose heat unevenly.
What to do: Duct sealing, added insulation, or a ductless head for the stubborn room usually fixes it.
An old oil or original-equipment furnace
Why it's common here: Plenty of older Puget Sound homes still run oil or a decades-old furnace near the end of its life.
What to do: Get a safety inspection and compare a heat-pump conversion — rebates often make it surprisingly affordable.
Air Conditioning
Seattle was built without cooling in mind — then the heat waves arrived. Cooling problems here are as often about not having enough capacity as about a broken system.
The house has no air conditioning at all
Why it's common here: Most older Seattle-area homes were built without AC; recent record heat waves made that a real comfort and safety issue.
What to do: A heat pump adds efficient cooling and heating in a single system — and qualifies for rebates.
The AC or heat pump isn't cooling
Why it's common here: Low refrigerant, or an outdoor coil clogged with pollen, cottonwood, and moss, or a failing capacitor.
What to do: Have the charge and coil checked, and rinse the outdoor unit each spring.
Window or portable units can't keep up
Why it's common here: They're almost always undersized for whole-home heat-wave loads.
What to do: Consider ductless or central cooling sized to your home with a load calculation.
You can't open windows to cool down in smoke season
Why it's common here: Late-summer wildfire smoke makes opening windows for night cooling unhealthy.
What to do: Mechanical cooling plus filtration (a heat pump with good indoor air quality) keeps you cool and the smoke out.
Plumbing
Old housing stock and a very wet climate define plumbing here — aging pipe materials, root-prone sewer lines, and a rainy season that finds every weak point.
Low water pressure or discolored water
Why it's common here: Many older Seattle homes still have galvanized steel pipes that corrode and clog from the inside out.
What to do: A repipe to PEX or copper restores pressure and water quality.
Sewer line backups
Why it's common here: Mature trees plus old clay or concrete sewer laterals are an open invitation for root intrusion.
What to do: A camera sewer scope finds the cause; jetting, lining, or a spot repair fixes it before it becomes a flood.
Water heater quitting
Why it's common here: Age and sediment shorten tank life — many fail around 10-12 years.
What to do: Get a repair-vs-replace assessment, and consider a rebate-eligible heat-pump water heater.
Frozen or burst pipes during a cold snap
Why it's common here: Pipes in vented crawlspaces and exterior walls aren't built for our occasional arctic blasts.
What to do: Insulate exposed pipes, and make sure you know where your main shutoff is.
A flooded basement or crawlspace in the rainy season
Why it's common here: Heavy, sustained PNW rain overwhelms or outlasts a failed sump pump.
What to do: Test the sump pump before the wet season and add a battery backup.
Electrical
Seattle's beautiful old homes were wired for a different era, and our windstorms test the grid every winter — so capacity, safety, and backup power top the list.
Knob-and-tube or aluminum wiring
Why it's common here: Common in pre-1950s Seattle homes — it's both a safety hazard and an insurance problem.
What to do: Get a safety inspection and plan a rewire of the affected circuits.
An outdated or recalled electrical panel
Why it's common here: 60-100A service and recalled Federal Pacific or Zinsco panels can't safely handle modern loads.
What to do: A panel upgrade (often to 200A) restores safe, adequate capacity.
Frequent power outages
Why it's common here: Windstorms knock out Puget Sound power most winters.
What to do: A standby generator or home battery with a transfer switch keeps the essentials — or the whole home — running.
Breakers that keep tripping
Why it's common here: Older homes have too few circuits for today's appliances, electronics, and space heaters.
What to do: Adding dedicated circuits or a subpanel ends the overload.
Not enough power for an EV charger or heat pump
Why it's common here: Electrifying your home needs capacity that older panels simply don't have.
What to do: A load calculation and service upgrade make your home electrification-ready.
Seattle home-problem FAQs
Why don't many Seattle homes have air conditioning?
For decades the Puget Sound's mild summers meant cooling wasn't worth the cost, so most older homes were built without it. Recent record heat waves have changed that — and a heat pump is now the popular fix because it adds efficient cooling and heating in one system.
Why is the water pressure low in my older Seattle home?
The most common cause is galvanized steel supply piping, which corrodes and narrows from the inside over decades. As the buildup grows, flow drops and water can look rusty. A repipe to PEX or copper restores full pressure and clean water.
Why does my power keep going out around the Puget Sound?
Winter windstorms regularly bring down trees and power lines across the region, so multi-hour and sometimes multi-day outages are normal here. A standby generator or a home battery with a proper transfer switch keeps your home powered safely until the grid returns.
What home problems get worse in the rainy season?
Moisture-driven ones: sump pumps fail and basements or crawlspaces flood, sewer lines back up as saturated soil pushes roots into old pipe, and damp cold stresses heat pumps and exposed plumbing. A little pre-season maintenance prevents most of it.
Are knob-and-tube wiring and galvanized pipes really a problem?
Yes. Knob-and-tube (and aluminum) wiring is a safety and insurability concern, and galvanized pipe steadily chokes off your water. Neither has to be replaced overnight, but both should be assessed by a licensed pro so you can plan — especially before you remodel or add modern loads.
Spotting one of these at your place?
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