It was okay. I believe there was a part or something that I had to buy so I paid more than the "Big Deal". Later, we had somebody else who came out because our air conditioner went out and they said they didn't do a very good job. They charged a lot for the part and I found out later that they didn't do a very good job.

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I'd discovered a leak on a water heater component Brennan had installed about 5 years ago. Not knowing who to call, I contacted them for a referral. They were super fast and sent someone right away that day, then when they determined that I needed a replacement circulation component they had service all set up within 24 hours. Cost of the labor was fine, but the cost of the component itself was absurd. I Googled it later and could have bought one for myself for about $400 less. ouch!
All in all, I do appreciate the fast service and knowledgeable staff, but the parts cost was ridiculous. I probably won't call them again.

The service was good and furnace heats our home. I was not present when they did the installation, my wife was. Scheduling was easy. They were overall helpful and did everything we asked them to do. They were upfront and answered all our questions too.

Good.

The company representative was very knowledgeable, professional, and prompt. It turned out that they had the make I wanted and the best price. I used the program that Costco has with this company. The only thing that was wrong was the positioning of the heat pump. It turned out to be on too much of an angle/slope. I called them and they had a tech come out who confirmed that it was too much of an angle/slope and he fixed the problem. There have been no problems since the install. 

Paul came out and assessed the room and what we wanted to do. He was very friendly and professional. He wrote up a quote and it was so reasonable that I said yes to getting the work done by them right away even though I had contacted several other companies. He called the office and the job was set up for the next day. Edward and Trevor came out on time the next day and did the job with ease. They were very polite and professional. The job was done within the slotted time and we are very pleased.

It went great. They were a good company.

It was okay. They basically did what agreed. They came out promptly and they installed the heater within the price range. I think I had one add on that was a little more and it seems to work okay. The guys were fine. I didn’t have any problems with the guys that came out.

A month later, no one had contacted me.  I called the service rep again.  It was clear he forgot all about it.  Told me he would order the thermostat and someone would call me to install it, and the quote was now $100 more than at the first one.  Today, February 3, 2014 I have still to received a call to schedule the appointment.  When I called the main number the woman who answered the phone didn't seem to care much that I've been left hanging all this time.  I told her I need the thermostat installed this week.  She said they do not have an appointment open.  Clearly, they do not need my business and I am now more than happy to NEVER give Brennan Heating my business.  They should have just said no to begin with rather than keeping me hanging all this time.  Very unprofessional!!!

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They installed the duct-work to vent a natural-gas hot water tank.

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He came out and he flushed it out but he didn’t empty it or anything but, he cleaned it all out.  He told me that he checked everything and gave me the condition and that was good.  He did a good job and gave me a lot of information about water heaters.  We talked about switching over to tank less water heater, I had some questions about that, and he answered them.  He showed up on time.  There was no extra cost.

They were very polite, professional and they did it in one day rather than the two they had initially mentioned.

It's been about 3 years that I have been looking for a straightforward Heating/Cooling service company.  I believe I finally found it.  I will be calling on Brennan from now on.  
Their technician Cary promptly diagnosed and fixed a problem.  I paid for the labor, and Brennan will bill the manufacturer for the part still under warranty.
Cary also kindly answered general technical questions I had about our heating system.
I greatly appreciate it.

All members of their team were professional and courteous.

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Purchased a tune-up package from them through an online coupon. Service was performed, but was not to my satisfaction. Owner, Eric contacted me last week to reschedule a tech to come out to "make things right". Tech came out this morning and fixed the problem. I appreciate Brennan going the extra mile for me and I would certainly use them again and would feel comfortable recommending them to others.

We used Brennan 17 years ago for our furnace, water heater and air conditioning and were SO pleased to see them as a provider through Costco. This time it was only the furnace, air cleaner, and thermostat to be replaced. They were very low pressure on the sales pitch and we truly feel we got just what we wanted. We got an estimate on Friday and installation was done Tuesday morning. It all went off without a hitch and we would definitely use them again!