Furnace Doctors

Licensed Oil Furnace Repair in Mercer Island, Washington

When your heating or cooling system stops doing its job, you need an HVAC company that knows how to solve the problem properly. Furnace Doctors brings over 45 years of industry experience to oil furnace repair in Mercer Island, combining factory-trained technicians with generations of hands-on HVAC knowledge.

Call Today At (888) 414-4328 (HEAT)

Emergency Service Available

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About Us

Founded in 1986, Furnace Doctors is a family-owned and operated company built on an HVAC tradition that stretches back even further. The family entered the industry in 1953, and that legacy continues today through second-generation ownership and active third-generation involvement. We’ve completed thousands of successful installations while building our business largely through referrals and long-standing customer relationships. With heating and air conditioning installation, maintenance, service, and repairs available from one team, we’re equipped to handle your ongoing HVAC needs. Our focus has always been straightforward: knowledgeable service, quality workmanship, dependable equipment, and solutions made to last. Learn More

Heating Services

Your heating equipment has to perform reliably when colder weather arrives. Furnace Doctors handles heating installation, maintenance, service, and repair with dependable performance as the priority. From sudden heating failures to planned equipment upgrades, our experienced technicians can assess your system and recommend a practical solution.

Air Conditioning Services

As indoor temperatures rise, our technicians can help restore the dependable cooling your property needs. We service, repair, maintain, and install air conditioning equipment for homes and businesses. Our technicians work with all makes and models, bringing extensive training and proven experience to each job so your system receives knowledgeable, professional attention.

HVAC Installation

Quality equipment matters, but proper design and skilled workmanship are equally important to a successful HVAC installation. Thousands of completed installations have given Furnace Doctors extensive experience working with high-quality HVAC equipment and materials. Because we can fabricate custom sheet metal both in-house and in the field, our team can better manage the fit and quality of an installation.

HVAC Maintenance & Repair

Minor HVAC problems can turn into much bigger headaches when left unresolved. We provide experienced repairs and ongoing maintenance to help keep HVAC equipment performing properly. Our on-call service department also offers after-hours service, giving customers access to experienced help when HVAC trouble doesn’t happen during ordinary business hours.

Why Choose Us

For decades, our company has continued growing without the need for expensive TV and radio campaigns. Our reputation comes from doing quality work that customers feel confident recommending to others. No phase of our work is subcontracted, allowing our team to maintain control over quality throughout the job. Factory-trained technicians, custom sheet metal fabrication, mobile fabrication capabilities, and an on-staff licensed electrician give us the resources to tackle complex work properly. Long-tenured employees bring decades of practical experience to our company, providing customers with the benefit of seasoned HVAC knowledge.

Furnace Doctors - servicing Mercer Island, Washington

Look No Further for Oil Furnace Repair in Mercer Island, WA

Furnace Doctors brings the resources and experience needed to handle HVAC needs that go well beyond basic repairs. Our combination of trained technicians, in-house workmanship, sheet metal fabrication, and electrical capabilities allows us to take a comprehensive approach. A comprehensive approach can make an important difference when the problem extends beyond one component.

Our decades of practical experience support projects involving repairs, maintenance, custom fabrication, electrical work, replacements, and complete HVAC installations. Our focus is quality workmanship supported by materials and equipment chosen for dependable long-term performance.

Reach Out Today

Your HVAC system plays too important a role in everyday comfort to trust it to guesswork. Furnace Doctors combines more than 45 years of industry experience with factory-trained technicians, in-house capabilities, after-hours service, and a family tradition that spans generations.

Whether your system has suddenly stopped working, needs professional maintenance, or is ready for replacement, our team is prepared to help. Call Furnace Doctors today to put generations of HVAC knowledge and decades of hands-on experience behind your heating and cooling system.

    
 
 
       Posted on Google  
   
   EK - Mad Kandi 
 July 8, 2026
 
 
  JJ and the team saved us!

Our unit completely stopped working on one of the hottest days and thankfully we were able to get these guys out same day, while other places told us next day.

Thank you!
  
 
      Posted on Google  
   
   SAMARTH SHETTY 
 June 17, 2026
 
 
  I had a great experience with Furnace Doctor.
Rhett arrived on time, quickly diagnosed the issue, added refrigerant, and had my AC running properly again in no time. He was professional, efficient, and explained what he was doing without trying to upsell unnecessary work. The whole process was smooth and stress-free.
  
 
      Posted on Google  
   
   S T 
 June 16, 2026
 
 
  Came same day - and fixed our central air conditioning had the needed part on em which was great.
  
 
      Posted on Google  
   
   Vinay N K 
 May 13, 2026
 
 
  Had a great experience with Furnace Doctors. Technician JJ was extremely knowledgeable and took a very systematic approach to troubleshooting and diagnosing our HVAC issue. He carefully checked all components, including temperatures, capacitor functioning, and coolant levels, and thoroughly tested the system after the repair to confirm everything was working properly. JJ explained the process clearly and was professional throughout the visit. Really appreciated the attention to detail and confidence in the work performed. Highly recommend! The poor ratings online did not reflect the experience I had.

Need Professional HVAC Help?

Furnace Doctors

Proudly Serving the Greater Seattle Area!

Auburn, WA 98002

furnacedoctorsinc@aol.com
(888) 414-4328