No heat or weak airflow from vents even when the thermostat is set correctly
Heating · Mercer Island, WA
Heating Repair in Mercer Island, WA
Most heating repairs in Mercer Island run between $189 and $950, depending on the part and furnace age. SPS Pro Services has repaired heating systems across Mercer Island and King County since 2017, and we typically get a technician out for a diagnosis within a day or two of your call.
Typical cost$189–$950
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Mercer Island's housing stock is largely 1950s and 1960s split-levels built after the I-90 floating bridge opened the island to commuters, alongside newer teardown rebuilds that replaced smaller postwar homes. Original furnaces and ductwork in the older houses often start failing by decade four or five, with cracked heat exchangers, worn igniters, and ducts stretched thin by additions owners have built on over the years. We repair both the aging original systems and the higher-efficiency units installed during recent remodels.
Local knowledge
What's different about heating repair in Mercer Island
Mercer Island homes have their own quirks, and after years of visits here we know them well.
Mercer Island runs on PSE for both gas and electric service, so a control board fried by a windstorm outage or a gas valve issue both fall under one utility to coordinate with during repairs.
Many split-level homes built near the Lake Washington shoreline route ductwork through crawlspaces, where moisture from the lake's humidity accelerates rust on older sheet metal and corrodes furnace connections.
Mild, damp winters mean heat pumps on the island cycle through defrost mode often; older units from the 1990s and early 2000s tend to lose refrigerant charge and struggle to keep up on the coldest nights.
Symptoms we see daily
Signs you need heating repair in Mercer Island
System short-cycles, turning on and off every few minutes
Unusual noises such as banging, grinding, or a repeating click that won't start the system
Utility bills from PSE or Snohomish PUD climbing without a change in usage
Uneven heating between rooms or floors, especially in homes built before the 1990s
No surprises
How a Mercer Island heating repair visit works
1
Call and Phone Diagnosis
Describe what's happening with your heat and we'll ask a few questions to narrow down likely causes before we ever arrive.
2
On-Site Inspection
A technician checks the furnace or heat pump, ductwork, thermostat wiring, and electrical connections specific to your home's age and layout.
3
Upfront Pricing
You get a flat quote inside the $189–$950 range before any repair work starts, based on parts needed and labor involved.
4
Repair
Most repairs, from igniter and control board swaps to duct sealing, are completed same-visit with parts carried on the truck.
5
Test and Walkthrough
We run the system through a full heating cycle, check airflow at your registers, and walk you through what was fixed and why.
Flat-rate pricing
Heating Repair in Mercer Island — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| Diagnostic / service callCredited toward the work we do | $189 |
| Minor heating repairSingle small component or adjustment | $189–$440 |
| Typical heating repairThe most common jobs we see | $440–$700 |
| Major heating repairBig-ticket parts and labor | $700–$950 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo heat at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Heating Repair in Mercer Island — FAQ
Why does my furnace keep tripping the breaker in my Mercer Island home?
Many 1960s Mercer Island houses have shared circuits or original electrical panels that weren't sized for today's furnace blower motors and add-on components. A tripping breaker often points to a failing motor drawing extra current or wiring that's simply undersized for the load. We check both the furnace and the panel connection during the visit.
Do you still work on the older gas furnaces common in Mercer Island's mid-century homes?
Yes. A large share of the split-levels built here in the 1950s and 60s still run original or once-replaced gas furnaces, and we carry parts for standard pilot and older electronic ignition systems. If a unit is past reasonable repair, we'll tell you honestly rather than keep patching it.
How fast can you get to Mercer Island for a heating repair?
We're based in Seattle and cover Mercer Island regularly, so most calls get a same-day or next-day appointment during business hours, Monday through Friday, 8am to 6pm. No-heat calls in cold weather get priority scheduling.
Do you also handle heating repair in Bellevue or Sammamish?
Yes, we serve Mercer Island along with Bellevue, Redmond, Kirkland, Sammamish, and Seattle. If you own property in more than one of these areas, we can often schedule repairs back to back on the same day.
Founder & Lead HVAC Technician, SPS Pro Services
EPA Section 608 UniversalNATE Core Certified14+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records in Mercer Island and across the Seattle metro.
Prices reviewed July 2026
Also in Mercer Island
Other services our crew handles on the same routes.
Need heating repair in Mercer Island?
Call (206) 427-8907 to schedule heating repair in Mercer Island, Monday through Friday, 8am to 6pm.