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Brennan Heating & Air Conditioning
Heating Contractor
Today 7:30AM–5PM
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Check out our latest blog post! These facts will shock you! Who knew air conditioning was so cool? #1 is our favorite, which one is yours?! #airconditioning  
Who knew air conditioning was so cool?! We sure wish #6 were still an option. Check out these mind-blowing facts, and let us know your favorite!
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Now that winter has come to an end it's a good time to check your furnace filter. Check out our blog to learn why it's important to replace your furnace filters!  #furnacefilters
Now that winter has come to an end it's a good time to check your furnace filter. Read our blog to learn why it's important to replace your furnace filters!
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We are proud to announce that Brennan Heating & Air conditioning has earned the service industry’s coveted Angie’s List Super Service Award, reflecting an exemplary year of service provided to members of the local services marketplace and consumer review site in 2015!
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Did you know natural gas is expected to replace coal as a primary source of U.S. power generation? Discover the many reasons why this clean energy is the smartest way to heat your home. #cleanenergy  
Find out why clean energy discussions keep pointing to natural gas. Know your options and discover why natural gas may be the best way to heat your home.
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As temperatures start to drop, our heater bills are beginning to rise. Learn about these 5 easy and effective ways to cut your heater bills this winter while still staying warm. 1. Cover Windows & Patio Doors with Plastic Film According to the U.S. Department of Energy, windows can account for 10% to 25% of … Continue reading 5 Ways to Cut Your Heater Bills this Winter →
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We love a good DIY project, but some things need to be left to the professionals. Don't let the season go by without getting your HVAC system inspected. We're here and happy to help!
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Have them in circles
28 people
Canarsee Supply's profile photo
Vicki Fairall's profile photo
Titan AC's profile photo
Bella Roy's profile photo
The Longacre Company's profile photo
Aloha Air Conditioning & Heating's profile photo
Gehringer Mechanical's profile photo
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Are you aware of the benefits to having an air conditioner in your home? Check out our blog to see how the air can be improved in your home.
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Choosing a contractor can be difficult when you don't know what to look for. Check out these four components every quality contractor contains.
Get the job done right, the first time. Check out these helpful tips on how to choose a quality contractor.
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Find out why a new thermostat can change the way you live, for the better. The new capabilities of these small, but necessary devices may surprise you! #OptimumComfort  
Who knew the temperature of your own home can be changed from the palm of your hand? Discover how these necessary devices can bring you optimum comfort.
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A warm home is a happy home. How will you continue to heat your home safely? Read on to discover some important safety tips when it comes to your natural gas furnace. #NaturalGas 
Natural gas furnaces are a great alternative to electric heating. To ensure your family is safe in 2016, practice the following 4 natural gas safety tips.
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In the market for a new furnace? Learn some tips for what not to do when shopping around.
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Indoor air quality is important any time of year. Learn more from Lennox on how you can improve your indoor air quality. http://po.st/yt9ZHv
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Contact Information
Map of the business location
4601 S 134th Pl Seattle, WA 98168
4601 South 134th PlaceUSWashingtonSeattle98168
(206) 248-7900brennanheating.com
Heating Contractor, Air Conditioning Contractor
Heating Contractor
Air Conditioning Contractor
HVAC Contractor
Today 7:30AM–5PM
Thursday 7:30AM–5PMFriday 7:30AM–5PMSaturday ClosedSunday ClosedMonday 7:30AM–5PMTuesday 7:30AM–5PMWednesday 7:30AM–5PM

Brennan Heating & Air Conditioning is a locally owned and operated HVAC contractor that has been keeping homes comfortable since 1987. We provide Seattle furnace & air conditioning installation and repair and offer indoor air quality products.

Our superior technicians average more than a decade of HVAC experience and are factory-certified in top brands like American Standard, Maytag, and Lennox. Brennan Heating has received awards from Puget Sound Energy, Lennox, and Angie’s List for our energy-efficient, customer-focused heating and cooling services.

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Review Summary
3.6
15 reviews
5 star
7 reviews
4 star
1 review
3 star
2 reviews
2 star
No reviews
1 star
5 reviews
"Brennan installed our ductless heat pump recently, and we love it."
"The bathroom lights in the master bedroom were completely out."
"They came the same day as the heater went out and had us up and running."
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Have them in circles
28 people
Canarsee Supply's profile photo
Vicki Fairall's profile photo
Titan AC's profile photo
Bella Roy's profile photo
The Longacre Company's profile photo
Aloha Air Conditioning & Heating's profile photo
Gehringer Mechanical's profile photo
Martin Harrington's profile photo
Emmanuel HVAC's profile photo
All reviews
William Hollerich's profile photo
William Hollerich
3 weeks ago
Brennan Heating and Air Conditioning installed a central A/C system for my home in May 2016 and I was extremely impressed with their work. They helpfully identified one oversight made by the original contractor in the installation of the heating system in my 2 year old home which had the effect of severely limiting the amount of heat reaching the heating vent in the kitchen of my home. I had never noticed it before but when they pointed it out to me, I noticed immediately that they were right and I got it fixed. The Lennox A/C system they installed (the real reason they were at my home that day) works great and I am very pleased!
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Chris Milham
4 months ago
I chose BRENNAN HEATING & AIR COND LLC to install a new gas furnace and a new gas water heater. A team of 2 showed up to my house and had the job done in about 3 hours. The quality of the install was very good, and I could tell that these guys knew what they were doing and had been trained well. Very happy with the bid I got, and the service that was performed. Would highly recommend!
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Elliott Green
2 years ago
Our Brennan service tech, Adam, diagnosed a consistent problem with our gas furnace. Being on Bainbridge, we do not have natural gas service, we use propane. The original installer failed to convert one of our two gas furnaces from natural gas to propane. In the two years we've lived here we've had the original installer out twice to fix the furnace because it kept losing its pilot. Their visits were expensive, at $300 each, and totally ineffective. Adam diagnosed the problem, recommended that a propane conversion be installed, and quickly installed the required parts once they were available. We now have a gas furnace properly configured for propane that heats our living room.
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Theresa Dodge
a year ago
We had to call on Jason and Tim 3 times to come and fix our heater. We are renters and they treated us the same as if we owned this house! They came the same day as the heater went out and had us up and running. They made another trip out the next day to try and see if they could fix the problem the contractors caused when this house was built. It ran ok for a week but went out again. They came immediately and got us squared away! Thank you Jason for being so diligent and for doing such a good job! Very professional! They are the BEST!
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Roy Cabrera
4 weeks ago
The bathroom lights in the master bedroom were completely out. I saw a GFCI in the bathroom and was not tripped. I flipped the switch in the master bedroom and lights came on so I presumed there was no GFCI in this room . The home owner's club was notified and they sent Brennan Heating & Air Conditioning instead of an electrician. The tech in a minute found another GFCI in the adjacent bedroom and found it tripped. He flipped it and the lights came on and he offered to open and inspect the GFCI saying he might find something wrong with it. I declined. He called his office and the bill came to $174.11 including tax. Tell me consumers, isn't this a ridiculously unreasonable charge?
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Mark Hartman
10 months ago
I've upgraded Brennan to three stars. I was not pleased with the install work and I was actually the one who discovered they incorrectly set the mini-dip pins on the control board for a single-stage furnace, rather than a high-efficiency two-stage model. They also, I found out recently, switched the exterior air exhaust and intake, which explains why my siding has been damaged...when the furnace runs it's constantly blowing warm, wet condensate right back toward my house. But I must say I was quite impressed today when they came out and did a great job fixing the swapped exhaust/intake pipes. No charge, and we're talking six years after the original install...so, that's pretty darn good. Just make sure the install team isn't rushing through the job like the crew who tackled mine...
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Boyd Antonsen
2 years ago
We just had a heat pump installed by Brennan. We found them through Costco. They came to our home for an evaluation of our needs and gave us a very fair price. They showed up on the day of install on time and ready to work. The crew are all employed by Brennan. They do not sub out any of their work. So, they all work well together. They completed the job very quickly and professionally. They were very neat and tidy. If they had to enter the home they always took their shoes off. They were very polite and respectful. We even have a cat that can not go outside and they were very aware of not letting her out. We were very impressed with there friendly attitude and the finished product.
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Steve Lewis
5 months ago
Not happy with the work could have been better install ..Dryer has dents in door now.