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Brennan Heating & Air Conditioning


(2403) Verified Reviews

Founded 1987 • With Angi since March 2005

Business Highlights

Emergency Services OfferedEmergency Services Offered
Wears MaskWears Mask
Trade License Number
All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves.To find more licensing information for your state, visit our Find Licensing Requirements page.


8:00 AM - 5:00 PM
8:00 AM - 5:00 PM
8:00 AM - 5:00 PM
8:00 AM - 5:00 PM
8:00 AM - 5:00 PM

Phone Number


4601 S 134th Pl

Seattle, WA 98168
COVID-19 Update
We are actively performing full services. We are taking additional precautions to protect our customers.

Health & Safety Measures

We will wear masks and gloves when we visit your home
We offer estimates and quotes using video calling
We accept remote payment
All statements concerning COVID‑19 business operations and essential services are informational only, and are self‑reported and not verified by Angi.


Since 1987, Brennan Heating and Air Conditioning has served thousands of customers throughout the Puget Sound. We offer a variety of home comfort products including furnaces, air conditioners, heat pumps, hydronic heating systems, active air purifiers, and gas water heaters. We have even expanded to offer standalone electrical services in addition to heating and cooling repair and maintenance. Brennan Heating - Comfort You Can Count On....

Verified Reviews


(2403) Verified Reviews

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Hanns A.

Zero stars. The single worst customer experience we’ve ever had. We moved into a new home in the fall and the Brennan installed furnace starting kicking off within a few weeks, in the middle of a cold snap. $350, 3 technicians, 3 months and dozens of unanswered calls and voicemails later, I’ve got a new filter I didn’t need and a furnace that still doesn’t work. The entire winter has gone by, and the problem remains unsolved. By their own techs admission, the unit was never installed correctly. They promised to send someone out, and then crickets for months. Good luck getting a hold of someone. In the end, rather than attempt to remedy the situation, they apologized our home inspection didn’t catch it. I’m sure they are swamped with higher margin business, and are making a cold calculus. You should do the same. Save your money and time and go elsewhere, or set your expectations to zero. This company doesn’t care about its customers.

Description of Work
Furnace kicking off

Category heating & air conditioning/hvac

Cost $350

Services Performed? Yes

Work Completed On 03/17/2022



Mike K.

Spent $14,000 for AC install and new furnace 3 years ago with Brennan. Called to inquire if they would install new coil and they wouldn’t. Had another company install new coil. Called Brennan to inspect and verify coolant pressure/levels and they came out, told me it was low pressure but wouldn’t add coolant because they were concerned I would sue them if the system leaked. They would not perform diagnostics or test the system whatsoever and left. Do not trust your home to this company. They get their money grab from orders and leave you in the dust. Edit: Had AAA heating and air out to diagnose what Brennan misdiagnosed, AAA technician was out and quickly realized unit was not configured for heating. Charge was good, outdoor unit was set to AC only and Brennan associate was testing off the wrong connection when they told me it would be several pounds of coolant (several hundred dollars) to get unit running, which would have overcharged the system and possibly damaged the system. AAA found charge was well within acceptable range, found a quick jumper connection which set the unit to cooling only, reversed the jumper and now the system is running like a dream. Shoutout AAA heating and air in Kent area WA. Thanks AAA! Check them out if you’re in South King County area.

Description of Work
Heat pump dis-service

Category heating & air conditioning/hvac

Cost $14,000

Services Performed? Yes

Work Completed On 02/25/2022



Jim G.

If I could leave 0 stars...I bought an AC through Costco, and Brennan is their primary installer. My installation date was now 3 weeks ago. They showed up that day and worked through the installation. At the end of the day they left without the ~$400 air filter/box installed and with the AC not functioning (the power to it isn't even turned on). The service tech told me on his way out that he thought there was a leak somewhere because he couldn't get the vacuum gauge to the right level. He said he would leave a gauge on the system and someone would be back in a few days to check everything out, and that I would be contacted about the filter installation. As of today it has been 3 weeks...not a single phone call from Brennan!! I have called the salesman who sold me the unit a few times, and exchanged multiple texts with him...he has actually been really responsive and scheduled a time with the installation manager to come out. No one showed up that day and nothing has been scheduled since to actually get the AC operational or the filter installed. I totally understand how busy this company and other companies are right now, and would actually be OK with an extended timeline to get this repaired (likely won't need the AC till next year) :). However, the lack of any customer service is absolutely shocking...I cannot believe that I have not been contacted by anyone just to say 'hey we are trying to figure out a time to get back out there, etc'.

Description of Work
Air Conditioning Installation

Category heating & air conditioning/hvac

Cost $10,000

Services Performed? Yes

Work Completed On 10/04/2021



Tracie S.

I've wait to post this for some time because Brennan used to be great. They replaced our furnace 8 years ago and fix a lot of hard to reach electric. Their technicians have always been great, and company easy to work with. However, in the last 2 years, things have really changed and not for the better. First, good luck reaching anyone on the phone or getting a call back. And when you do, they're rude. Second, we had them do a routine service in May 2020. It was warm enough that the furnace wasn't in use, and we didn't realize the technician had accidentally broken an element during the cleaning. Something that happens, but was a real problem when the it got really cold in October and the unit wouldn't turn on. After 4 days of calling and leaving messages to get help fixing the furnace, and no call back, I finally had to reach out to another company that came out right away and diagnosed the problem. They ordered the parts and fixed it before we finally got a call back from Brennan. We really wanted them to have an opportunity to diagnose and fix the problem given they were the last ones to touch it. The manager apologized and offered to cover our costs (which was over $700!), but they never did. We gave them one last change with a new addition that we needed new electric, but after several days of leaving messages just to schedule an estimate, we heard nothing. Dead silence to this day. This in addition to having them do maintenance on an air conditioning unit and provide a cover for it. Despite all of the measurements and model/serial number info I provided, they ordered the wrong size (too small!), the Tech offered to reorder and replace, only to have the person who answers the phone deny it. Said it was our fault, but we didn't tell them what to order. I provided all of the info she requested, and I expected they would order the correct cover. I don't know anything about air conditioners, that's why I paid a marked up price through them to get it right. Big mistake. Don't waste your time or money. Go someone where else where they stand behind their work, and care enough to actually call you back and warranty their work. If they won't warranty small things like this, imagine the impact on something larger like a furnace or full duct install.

Description of Work
Furnace Fix and electrical for a new outdoor patio extension

Category electrician,heating & air conditioning/hvac

Services Performed? Yes

Work Completed On 03/08/2021



J A.

On January 15, a maintenance individual from Brennan Heating & Air came to our house for our annual heater and air-conditioner service . Prior to his arrival, the furnace had a MERV 16 filter(a hospital grade filter which had been installed the previous year by Brennan), and we had a spare 14 sitting by the side of the unit. After the person left, my wife checked and our spare 14 filter was missing and the 16 had been replaced with an 8. I’ve tried contacting Brennan on several occasions, first to request an itemized breakdown of the work done, and also to report the possible theft. No one from Brennan ever returned my calls, no emails, nothing. It wasn’t until I sent an email to the original salesperson at Brennan, threatening to contact the Washington State Attorney General and Bank of America’s fraud department, that the maintenance manager called me back. At that point, he accused my wife of misreading the filter that had been installed. She is an environmental scientist working in the field and knows the difference between filters. I told him we had a photo of the incorrectly installed filter and forwarded it to him. His response, “If there is an issue that needs to be addressed with my technician I will make it my utmost priority “ didn’t address our concerns at all. I also requested a credit for the 16 filter we had to purchase on our own, to replace the cheaper 8 which had been incorrectly installed, but again have received no response. I've contacted the Washington State Attorney General, and they are pursuing the issue with Brennan.

Description of Work
Routine maintenance

Category heating & air conditioning/hvac

Cost $326

Services Performed? Yes

Work Completed On 01/15/2021



Sharyn E.

It was an excellent service. They are the best.

Description of Work
They do maintenance for me.

Category heating & air conditioning/hvac

Services Performed? Yes

Hire Again? Yes

Work Completed On 06/02/2020



andrea B.

I have used this company before, but this time they were poor in the customer service department. Very slow in responding to my questions and when I asked to speak with a manager, I was ignored. In the end, when they came out to finally install the air cleaner, everything worked out well. It took too long to resolve the matter of the install and I got no answers to the needs I had.

Description of Work
installation of a whole house air cleaner

Category electrician

Services Performed? Yes

Hire Again? Yes

Work Completed On 11/15/2019



Christine L.

Lisa at the office was very helpful and recommended James as a technician who would most likely be able to diagnose the problem. He came on time, wearing a mask and gloves, diagnosed the problem as worn motors, called and got a quote on the spot and ordered the motors when I agreed to the price. James returned to install the motors within four or five days. It all went smoothly and now my heat pumps run quietly. I was very pleased with the service, especially as no other heating contractors had diagnosed the problem or offered to repair it.

Description of Work
My older mini-split heat pump interior units had developed an annoying whistling noise.

Category heating & air conditioning/hvac

Cost $1,500

Services Performed? Yes

Hire Again? Yes

Work Completed On 07/21/2020

Service Provider Response

Hi [Member Name Removed], thank you for your positive feedback and thank you for your business!


Mrs M.

Excellent. They gave us an early estimate and came in under that. Very pleased with their service. Would definitely re-hire and recommend.

Description of Work
repair exhaust pipe

Category electrician,heating & air conditioning/hvac

Cost $500

Services Performed? Yes

Hire Again? Yes

Work Completed On 08/06/2020

Service Provider Response

Hello, thank you for your positive feedback and thank you for your business!


Jonathan H.

We were referred through Brennan through our local Costco. The representative we were working with seemed reasonable enough from the get go. After several weeks of talks regarding what we wanted, various price points, etc we decided to go with a heat pump system as it was more efficient. We visited the in store rep as well and discussed the pros and cons of various systems and she told us she'd ask for a special rate that was offered through Costco for heat pumps at the time. This turned out to be a lie. The in-home rep showed us what was messaged and it was simply "I spoke with so and so today about this system or that system." Unbelievable. The rep then told us that because we opted for this heat pump system it would now take several months past our desired install date (already nearly 60 days outs) to get this job scheduled because A/C jobs are preferable for the business. I can't believe Costco partners with them to be honest. We ended up going to a smaller shop who was able to meet our timetable and price-point, without making us feel like an inconvenience. I would never recommend this company to anyone.

Description of Work
Install central A/C heat pump

Category heating & air conditioning/hvac

Work Completed On 07/27/2020

Services Offered

Residential furnace repair, maintenance, and installation. Residential air conditioning repair, maintenance, and installation. Residential water heater repair or replacement. Generator install, boiler installation, thermostat replacement and programming, and residential electrical projects.

Services Not Offered

Commercial HVAC or Electrical services.

General Information
Free Estimates
Eco-Friendly Accreditations
Payment Options
Visa, MasterCard, American Express, Discover, Check
Emergency Service

Frequently Asked Questions & Answers about Brennan Heating & Air Conditioning

How is Brennan Heating & Air Conditioning overall rated?

Brennan Heating & Air Conditioning is currently rated 4.7 overall out of 5.

What days are Brennan Heating & Air Conditioning open?

Brennan Heating & Air Conditioning is open:

Monday: 8:00 AM - 5:00 PM

Tuesday: 8:00 AM - 5:00 PM

Wednesday: 8:00 AM - 5:00 PM

Thursday: 8:00 AM - 5:00 PM

Friday: 8:00 AM - 5:00 PM

What payment options does Brennan Heating & Air Conditioning provide

Brennan Heating & Air Conditioning accepts the following forms of payment: Visa, MasterCard, American Express, Discover, Check

Does Brennan Heating & Air Conditioning offer free estimates?

Yes, Brennan Heating & Air Conditioning offers free project estimates.

Does Brennan Heating & Air Conditioning offer eco-friendly accreditations?

Yes, Brennan Heating & Air Conditioning offers eco-friendly accreditations.

Does Brennan Heating & Air Conditioning offer emergency services?

Yes, Brennan Heating & Air Conditioning offers emergency services.

Are warranties offered by Brennan Heating & Air Conditioning?

Yes, Brennan Heating & Air Conditioning offers warranties.

What services does Brennan Heating & Air Conditioning offer?

Brennan Heating & Air Conditioning offers the following services: Residential furnace repair, maintenance, and installation. Residential air conditioning repair, maintenance, and installation. Residential water heater repair or replacement. Generator install, boiler installation, thermostat replacement and programming, and residential electrical projects.

Are there any services Brennan Heating & Air Conditioning does not offer?

Commercial HVAC or Electrical services.