Had no a/c so called for service. they were here by 10. Fixed by10:30 and incredibly reason able. I will always use them. read more

Gary O'Brien has been very responsive and professional in helping me with my furnace. The company who installed my furncae wanted to charge me $400 to fix a leak, but Mr. O'Brien resolved the problem more reasonably for $100. He later responded to my call about a noise emanating from the furnace. He spent about 30 minutes inspecting the furnace but found nothing. He and encouraged me to call after the 'furnace' season returns to report whether I still hear the noise. He is very personal, friendly, and conscientious. I will call him again if I have another problem. read more

I called O'Brien Heating and Cooling to repair my boiler that needed a new gas valve I was told that the boiler was too old that Parts could not be ordered to repair it . I would need to replace the boiler at the cost of $7,100 . I called in another person for a second opinion he went to a supply store purchase the gas valve I needed and had my boiler running within 12 hours it cost me a little over $300 . I will never use O'Brien Heating and Cooling again I am a senior citizen female living alone and I feel I was taken advantage of . The man who repaired my boiler told me it will last the rest of my life as long as it does not leak water the boiler is in perfectly good working order . I would not recommend using O'Brien Heating and Cooling especially if you are a female senior citizen or disabled as I myself am . They should be ashamed of themselves for taking advantage of the elderly read more

I made an appointment, took the day off of work and they never showed up. I called and left a message and no one called me back. I don't see how anyone could recommend this company with that type of service or should I say lack of service. read more

New water heater installed and old one removed. O'Brien Heating and Cooling was responsive from onset. Clean and thorough installation and removal. Gold standard, old school service!! So rare now-a-days. Unbelievably fair price. I'll definitely call them again for any other HVAC needs I have in the future. read more

Excellent service, advice and yearly check ups I have used them for years, respond right away

O'brien to the rescue again- our central AC system was old and had been out of service for some time. Our research showed that it would be $7000.00 plus to have it replaced. Turns out it just needed recharging... total bill was under $300.00 including house call! Thank you O'brien! read more

No one works harder or is more honest than these guys. Unfortunately, the bad review from Michigan must have been meant for another company, maybe if you live in Michigan just be cautious if someone named Jerry comes to fix your furnace or AC. FYI- the phone number on the Yelp site is incorrect. The correct number is 847-662-5136. And if you use google they will say OBrien Heating is closed, that is not true, Other search engines like Safari are correct. read more

We had them install a new furnace about 3 years ago and that went very well. They did a good job and we had no problems at all. They cleaned up after themselves. They put down coverings on the floor and rugs so no mess was dragged in or out on the carpet. We've used them for 10 years and highly recommend them. read more

O'Brien Heating & Cooling just saved the night for us at our Grayslake home! Our furnace wouldn't ignite and the temperature is dropping to -27 degrees. I called and left a frantic voicemail. I received a call back in less than 5 minutes. He walked us through several steps over the phone and we now have heat!!! The professionalism and kindness demonstrated will not be forgotten. Thank you so much! read more

My coworker recommended O'brien heating many years ago and I have been using them ever since. They only sell what you need and are honest in telling you what you don't need. They have done cleaning services on my air conditioner and I have not needed any work done even after two other places previously said it needs compressor replacement. My furnace went out in the winter and they were here in 30 minutes on a Friday to fix it. They explain everything in detail what they are doing and also tell you how to maintain your air conditioner and furnace. They replaced my burnt out control board and their prices are very reasonable. I will not use anyone but them when I have an issue. I wish more businesses would be as trustworthy as them. My life would be less stressful! Thank you O'brien read more

We called O'briens for a second opinion after being referred by a few people. Gary came out and offered a no cost solution after ABC Heating and Cooling told us we needed either a $1000 fix or $6500 new system to fix our dirty AC according to Gary. Gary diagnosed the problem over the phone after my husband explained what ABC told him. Though it was $100 for the service called, it saved us $6500 as well as a possible $2000 on Aeroseal which he said would net us no return. Turns out, after he came out, what they said wasnt an issue at all! It system just needed to be cleaned! I am so happy we found a small, honest company that we can trust to go back to and not take advantage of us. If you have an issue, call these guys, you won't be disappointed! read more

We use O'Brien heating & Cooling and couldn't be happier. Gary O'Brien is the owner and is very professional and friendly to work with. He was recommended by a friend of mine and I understand why. He gives you options with repairs and provides valuable information on the short and long term outcomes of the work needed. We is also very responsive to his customers and we can rely upon him. Today was a great example, our AC went out last night and I called him at 6am and he was here in 30 mins on a Sunday morning. He is a pleasure to talk to and his pricing is very far for the quality of work that he does. Highly recommend! read more

Super honest and professional. I called with a problem they easily could have come over and charged me for but that Gary helped fix over the phone. He also cleans my furnace. But because it's so clean, he suggested coming over less than once-a-year when he could have ripped me off, and I wouldn't have known the difference. He's honest and will only do what's needed. read more

Fantastic service! Response time was 20 minutes from my call when other companies were saying several days wait time for an appointment and one company wasn't even taking new customers. Reasonable prices and didn't try to sell me anything I didn't need. Will definitely call O'Brien again! read more

Jerry arrived on time. He seemed nice enough. He showed me the issues with our boilers and he replaced a pressure valve. He then told me he needed to order another part and he'd be in touch. Two weeks later no word. I called multiple times with no response. I went to turn our furnaces on and found out neither was operational due to what he did, plus now there is water leaking from the system. I had to call another company to do the work, but they can't do it til first week of November. In the meantime it's gotten cold and we have no heat. My 70 year old mother in law lives upstairs as well. Not sure what his issue is, but I'd like to stick my foot knee deep in his a$$. read more

Excellent service. Very fast responce time; they returned my call within hours. Our AC unit is 15 yrs old, and this is the first time the thing quit on us. Instead of trying to sell us a new unit, they replaced one part, did a general check-up, and we're back in business. My wife and I are very happy with their service. read more

Contacted O'Brien Heating and Cooling on a Saturday morning to inquire about setting up an appointment to discuss replacing our furnace and possibly our A/C unit. The turnaround time from my left message to receiving a return phone call was extremely quick. Spoke with Gary and inquired about appointment time - with that "he" asked if we had an emergency situation or just looking into replacing. I advised him that our furnace had quit on us the day prior and in all honesty we were suffering some, due to the heat. With that said, he stated, "I can be out at 11:30". Wow! Can you imagine my surprise? Someone who actually works on a Saturday! Unbelievable. At 11:30 Gary was here as promised. Looked over our furnace and A/C unit. Talked with us about the different models and supplied us with pamphlets and pricing. Now, here's something that you never hear of....he then proceeded to fix our furnace with new parts, got our A/C running and are you ready for this??? Didn't charge us a dime! Yes, you read that correctly! Not a dime! Also, set appointment for installation of the new furnace and A/C without asking for or requiring a deposit! I asked him several times if he wanted a deposit check. Nope...nada. I had to pinch myself to make sure I wasn't dreaming! Oh, and I'm sure that some of you are thinking that the quote he provided for the new furnace / AC system was high. Nope, better than what I received over the phone that very morning from three other businesses - which didn't have time for me until the next week. I can't say that the above is something that transpires every day, but I will say this. He did it for us and we're extremely grateful. Totally unbelievable experience! This is how every business should be run. If you find yourself in need of a Heating and Cooling professional - then this is one business that you definitely want to contact and do business with! Outstanding! O'Brien Heating and Cooling set the bar - just wish others would follow. Keep up the excellent customer service! The only thing that could make our experience any better; would be for them to bring us a businees refrigerator magnet on the day of installation! Why? so we have their number handy - cause we're going to tell everyone we can! read more

Our AC and furnace finally died and we called O'Brien's right away. Gary came out immediately to give us a quote on both units. He did not try to sell us something we did not need or could afford. Both units were replaced the follow week and thank God because the temperatures were in the 90's! Joe and Phil did an excellent job installing the units and were both very knowledgeable about the products they were installing. O'Brien's are a honest and reliable company. We could not have been happier with their service. Thank you Gary, Phil and Joe for a job well done! read more

I was referred to give this O'Brien's a call to look at an older furnace which was not working properly. We were really concerned that we were going to be told that the furnace needed an extensive and expensive repair. However, Gary diagnosed the problem right away and fixed the furnace in less than an hour. He also cleaned the unit and noticed that the chimney cap needed to be replaced. Very reasonable, honest and professional.......Very pleased with my experience with O'Brien Heating. Totally would recommend them to my friends and family. read more

On a snow covered night my furnace decided to quit working. I called the service I had used before and received a response that didn't please me. They didn't want to come out because the snow was coming down and they lived further away than they deemed acceptable for my request. Luckily for me, I started looking in the phone book for someone who would come to my rescue. Mr. O'Brien showed up at my door within a half hour. He quickly went to work, figured out what was wrong, replaced the part, and we had heat within the hour!! He was a pleasure to work with and explained what was wrong. He didn't try to sell me a new furnace (although I will use him to replace my 18 year old furnace soon) and I am so grateful for his fine service. O'Briens is a local business (Gurnee, Waikegan, Grayslake) and he employs 2 other technicians. So if you need heating or air conditioning services who are willing to come out in a snowstorm to help a stranger this is the place to try!!! Thank you Mr. O'Brien!! You have a satisfied new customer!! read more

We have been using O'brien heating for 3o years. A very, very satisfied customer Excellent service Have recommended may of our friends O'brien keep up the excellent service read more