What Our Customers Say About Us

I would like to express my appreciation and tell about my experience with L&M HEAT COOL Service Company. My heater had broke during a very cold week of February. I called the Heat Cool Services and Mark came the same evening to diagnose the problem. He found that the heating element broke and explained to me that manufacturer doesn't produce such details any more, my old heater was more than 30 years old. Mark recommended to install a new heater - energy efficient and modern. I took his advise and I am happy with this decision and with the work Mark has done. He did a very good job installing the new heater and new humidifier. I would definitely recommend him to my friends if they need heating or cooling services.


I am writing to thank Mark and his L & M Heat Cool Service company for the great service I received when I needed a new furnace and A/C unit recently. Mark looked at my existing unit, which was original to the building and after many years of good service would not last another winter. He recommended the best manufacturer, size, efficiency level, warranty and price for my size condo unit. I went on-line and was impressed with the features of the unit he recommended and its greater efficiency level. I told Mark to go ahead and order it. He carefully removed my old furnace and a/c unit and installed the new one, with a new thermostat- even purchasing and placing a new concrete slab for the a/c unit so it would be above the grass and rain line. Mark did a beautiful job. He was not only neat, clean and very knowledgeable, but he also worked with me to satisfy my time constraints. After the installation, he gave me another card and told me if I had any questions or concerns to be sure to call him. I am very pleased with my purchase, its performance and with Mark's expertise. I would not hesitate to use him again or to recommend him and his company. If you have any further questions, I can be reached at 847 795-0296.

Thank you! Karen

Mark and his team converted our hot water heating system to a forced air heating and air conditioning system. This work was part of a remodeling of the first floor of our house. Our general contractor recommended L & M Heat Cool Service. Mark provided a very reasonable price to remove my existing furnace and radiators and install the new forced air system including the duct work.The decision to replace the heating system was made well into the general contractors work so the heating system work had to be done quickly so as not to delay the other work.We accepted the estimate on a Thursday and Mark and his team began work on Saturday. They worked through the weekend and continued (working form early in the morning until late in the evening) until the work was completed. They fabricated all of the sheet metal duct work. The workmanship is excellent and the system has been in operation for 6 months without any problems.We highly recommend L & M HeatCool Service and will call them for all of our service needs.

Gary & Claudia Mundinger 773-338-3072

I would like to post a comment regarding the excellent work performed by L& M Heatcool Service. They replaced my air conditioner and also my mother in law's. The service was professional and I did not have to wait long for the installation. I have recommended his service to many homeowners from the condominium that I live and everyone is very satisfied

George Muller 847-293-4188

It has been my pleasure to be a client of L & M HeatCool Service. I had my air conditioning unit replaced by Mark and was very happy with his prompt service. When a problem arose, he came back and did a great deal of work without charging me any additional fee. He has a wonderful work ethic and goes out of his way to set up a convenient time to do the job. I would definitely recommend using this company.

Sheila Patt (847) 317-8731

My heating system was 24 years old and was starting to nickel and dime me.One time a new motor then a new squirrel cage then a vacuum breaker and so it was time to replace it.When you replace a system you hope you chose a person who takes personal pride in his work. I could not have chosen a better company to do mine. Since my air conditioning worked OK. He replaced just the heating unit and humidifier.The workmanship was superb and I am very satisfied with my system. I would highly recommend Mark anytime.

Fred K.

L & M HeatCool SERVICE TO THE RESCUE! Our heating boiler died just as Xmas was ending. Late the next day, L & M HeatCool Service was the only service willing and able to brave blowing snow and cold on the drive from Chicago to Grayslake in order to repair it! Afterwards Mark pointed out something we already knew: that the boiler really needed to be replaced. He guided us in the purchase of a new boiler, and a couple of weeks later arrived to install it. Both times we were impressed with the quality of Mark's work: he was knowledgeable, attentive to detail, thorough, punctual and clean. As a bonus he was patient and good-natured. And to top things off, he was reasonably priced and followed up his work with phone calls. We will certainly use L & M HeatCool Service for all of our future heating and cooling needs, and also recommend it to family, friends and neighbors.

Barbara and Vladek Bednarz, Grayslake, IL 847.543.1684

L & M Heatcool Service installed a furnace and air conditioner in my condominium unit in July 2009. Seeing that I have never purchased either units, I shopped around to evaluate my options. I had no idea of the cost. L & M's price was the best! In my experience, when someone's price is competitive, the quality is compromised. Not in this case! L & M not only provided a great price, they also provided EXCEPTIONAL service. Overall, their quality, service and professionalism exceeded my expectations. I was very pleased with L & M's service and would highly recommend the company.

Karen Whalen

When a water heater breaks down at the house with family of 6 it’s a pretty uncomfortable situation. Thanks to L&M Heat Cool Service it wasn’t a disaster. Their technician showed up next day and was able replace the unit with the state of the art energy efficient water heater, which saves us money, and most important made the shower sprinkle us with warm water the at day. I’m very satisfied and would recommend those guys to anyone in need of any heating or cooling problem..


L and M Heat Cool Service installed our new furnace, air conditioner, and humidifier. Their bid was competitive and the installation was excellent. Mark and his team worked efficiently and professionally. We were very satisfied with their work and they even followed up to make sure that everything was running well. We have already recommended them to our neighbors.

Dr. Thomas B. Dozeman and Dr. Mary R. Talen (312-9294066).