Trusted Home Services Across the Puget Sound Since 1987
HVAC Contractor in Mercer Island
Brennan Heating & Air Conditioning is a top HVAC contractor in Mercer Island, WA. With over 30 years of industry experience and a 100% customer satisfaction guarantee, we’re your leading heating and cooling company.
We’re proud to be a BBB-accredited business with an A+ rating and a consistent winner of the Angi Super Service Award.
Energy Consultation
HVAC Company for Prompt Repairs
While you may not want to think about it, your HVAC system is likely to break down at some point over its lifespan. When most people think about an HVAC system breakdown, they picture the system not starting at all. While that can certainly happen, many times, the issue may not be as obvious. For example, your system may start to make a weird noise that you’re not used to but still produce adequate heat or air conditioning. Just because the problem isn’t as prominent as the whole system not starting, that doesn’t mean that you don’t need to get professional repair service. In fact, it’s very important to get repair service for any potential issue that you have with your system to help prevent further damage from happening.
There are many different signs that will let you know that you need professional repair service, such as:
- Not starting
- Blank thermostat screen
- Weird noises
- Odd smells
- Not blowing cold or warm air
Service That Speaks for Itself
See Why Western Washington Homeowners Love Brennan
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“Detail-oriented and their technicians spend time teaching you the system. I also can’t believe they also came back the next day to caulk a tiny hole they made. You get quality with Brennan.”- Marcin N.
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“The install team was great. They were all experienced and really enjoyed their jobs, and it showed. I love our new Carrier 38MURA hvac system already, and it's not even hot out yet.”- Melissa R.
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“Bryan & Michael arrived early as I requested and worked hard to clean the furnace vents, returns, and ductwork, including the dryer vent. Our daughter had recently used Brennan & recommended the company. I am delighted with the results.”- Janie H.
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“The service was extremely professional, courteous, respectful, and knowledgeable. We loved Dakota & Brian!”- Lloyd N.
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“Excellent and efficient service. Brayan Rodriguez and Giovanni did a great job. Brennan will be my go to for services needed”- Diane V.
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“The services provided by the Brennan staff were outstanding. Sergio & James were on time, completely explained the 5 W's before starting, they were efficient, cleaned up as they worked, explained how each part of the system functioned.”- Steve S.
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“I had Brennan come today to clean my air ducts. Since this was the first time having it done, it was reassuring to know it’s a pretty simple & fast process, and totally affordable. You're always in good hands with them.”- Sandy M.
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“Our experience from estimate to installation was outstanding! Their price and quality of installation were a great deal. I highly recommend them for any Water Heater, AC, or Heating needs!”- Douglas D.
Service You Can Rely On. People You Can Trust.
A member of our team will be in touch shortly to confirm your contact details or address questions you may have.
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Smarter, Safer, & More EfficientFrom high-efficiency HVAC installs to LED lighting upgrades and surge protection, we’re here to improve the way your home feels—and functions—year-round.
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Award-Winning CareMulti-year Angie’s List Super Service Award winner with an A+ BBB rating, Brennan is Seattle’s trusted partner for top-tier heating, cooling, and electrical services.
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Integrity Meets InnovationFrom certified energy consultants to licensed electricians, our team brings you forward-thinking solutions backed by time-tested values of honesty, reliability, and expert care.
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Trusted Since 1987With decades of experience and thousands of satisfied customers, Brennan delivers worry-free heating, cooling, and electrical solutions with service you can count on.
Ways To Save With Brennan
From flexible financing to energy-efficient upgrades—we make comfort more affordable.
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Flexible FinancingDon’t let budget concerns delay your comfort. We offer trusted financing options to help you move forward with confidence. -
Current SpecialsWhether it’s seasonal savings or limited-time discounts, we’ve always got a way to help you save more.
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Energy RebatesEligible HVAC upgrades could qualify for big rebates under the Inflation Reduction Act. Let’s help you save while going green.
Heating and Cooling Company for Installations
Getting a new heating or cooling system can be a very large investment for the average homeowner. It’s important to ensure that you’re investing your money in a product that will meet your needs and last for a long time. Our HVAC company offers a wide selection of both heating and cooling products to meet your every need. We can install furnaces, boilers, heat pumps, central air conditioning systems, and ductless mini-split systems. We can even help you determine which systems will make you eligible to receive a federal tax incentive so that you can recoup some of the upfront cost of your new system.
Energy Consultation
Mercer Island’s HVAC Contractor for Maintenance
There’s no doubt that one of the best ways to keep your heating and cooling systems in good working condition is to give them regular maintenance. As a homeowner, you want to keep up with regular filter changes and ensure that the outside AC unit is free from debris throughout the summer season. It’s imperative that you have a professional come in each spring to service your air conditioning system and each fall for your heating system. This service is necessary to catch any potential problems that your system may have before the most extreme temperatures arrive, and will help maintain the warranty coverage on your HVAC unit.
If you’re looking for an excellent HVAC contractor in Mercer Island, be sure to call the professionals at Brennan Heating & Air Conditioning today.
From food banks to foster care, Brennan is proud to give back to the communities that trust us with their comfort.
