Furnace Doctors

Professional Oil Furnace Installation 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. With more than 45 years of industry experience, Furnace Doctors provides dependable oil furnace installation in Mercer Island for homes and businesses, backed by factory-trained technicians and generations of hands-on 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

Cold temperatures can quickly reveal problems with your heating system. Furnace Doctors services, repairs, maintains, and installs heating systems with an emphasis on dependable performance and quality materials. Whether you’re dealing with an unexpected failure or planning an equipment upgrade, our experienced technicians can identify the problem and provide a practical path forward.

Air Conditioning Services

As indoor temperatures rise, our technicians can help restore the dependable cooling your property needs. Our team installs, maintains, services, and repairs air conditioning systems for residential and commercial properties. With experience across all makes and models, our trained technicians provide knowledgeable, professional attention to your cooling equipment.

HVAC Installation

The performance of a new HVAC system depends heavily on its equipment, design, and installation quality. Furnace Doctors uses high-quality materials and equipment and has completed thousands of successful installations. 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

A small HVAC issue can become a much larger inconvenience when it is ignored. We provide experienced repairs and ongoing maintenance to help keep HVAC equipment performing properly. With an on-call department offering after-hours service, Furnace Doctors can provide experienced assistance when problems occur outside normal business hours.

Why Choose Us

Furnace Doctors has stayed busy for decades without depending on costly television or radio advertising. Our reputation comes from doing quality work that customers feel confident recommending to others. Because we keep our work in-house instead of subcontracting it, we can oversee quality from start to finish. Our factory-trained and certified technicians receive extensive training, while our in-house custom sheet metal fabrication shop, mobile sheet metal capabilities, and licensed electrician help us handle demanding projects properly. Some team members have been with Furnace Doctors for decades, giving customers access to extensive knowledge developed through real-world HVAC experience.

Furnace Doctors - servicing Mercer Island, Washington

Look No Further for Oil Furnace Installation 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. That matters when a project involves more than replacing one failed component.

From troubleshooting and maintenance to fabrication, electrical needs, replacement, and complete installations, our team applies decades of hands-on HVAC experience. We pair careful workmanship with quality materials and equipment to deliver HVAC solutions designed for lasting reliability.

Get in Touch Today

Your heating and cooling system is too important to leave to guesswork. Our family HVAC tradition, more than 45 years of experience, expert technicians, in-house capabilities, and after-hours service give customers dependable support.

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

    
 
 
       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