"He is absolutely the best! He’s incredibly honest and straight forward. You don’t have to worry about him upselling you in any way. He provides many different avenues for projects, depending on the cost desired. He’ll truly provide an honest opinion. His prices are also very fair for all work. I had one project where he had to return multiple times and I was only charged for 1 trip! He’s able to accommodate your schedule as well, as he’s open on weekends. He’s also computer savy; able to take credit cards and email invoices. His staff is also incredibly professional. Overall, he’s a really great guy!"Copied from Angies List

 "The overall experience with this company was GREAT! Unlike ALL of their competitors on Angie's List (except for Deljo of whom we were prior customers) NOT ONE would answer our emergency service call. Mark and Martin worked in tandem to quickly address our needs and everything was done w/in hours. We were in a dire situation and they were very compassionate and professional. I can't express how satisfied we were with this small company. Mark, the owner/dispatcher, was very sick with the flu but still managed to address our needs and was very understanding about our extremely emergent situation. We are very grateful to this small company and would recommend them 100% over their larger, more visible competitors."Review from Angieslist 

"The appointment was very easy to make, I did not expect service within same day Serviceman Mark was a pleasure to work with he called 30 minutes before he arrived when service was completed he explain everything about the repair and my heating system. Very knowledgeable guy. Overall very good experience." This review is from Angieslist 

  “I purchased my home six years ago and had a different company service my A/C twice a year. I was paying a lot but the air conditioning still didn't work as it should have. Finally, I called Cool Z Heating and Maciej fixed all my HVAC problems. Quick and professional service. I would recommend this company to anyone.
”– James Sanders, Oak Park, IL.

 "We have contracted with Cool Z for a number of projects. And each time, the projects were completed on time and on budget. Cool Z also performs annual maintence on our 6 HVAC units as well as our 3 Walk in units. Having the annual maintence has virtually eliminated the costly repairs that we experienced prior to Cool Z taking over our account" 
-John Kapusciarz, GM European Chalet Banquets in Chicago, IL

”I have been in the construction business for many years and have been working with CoolZ for the past 4 years. You'll be hard to find a more experienced and dedicated group! Highly recommended! 
”– Tom Pilewski, Wheaton, IL.

“Cool Z Heating is OUTSTANDING! Finally, a true professional company that resolved all of our heating problems. 
”– Hilda Johnson, Chicago, IL.

"Great service I received, in the repair work to my old unit, the help in choosing my new unit and the installation of my heating and air system. You have a customer for life. 
- Adam Lee, Antioch IL.

"The service technician was very professional, gave me all of my options (about repair or replace) and no high pressure tactics were used." 
- Dorothy Koelle, Lincolnwood IL.

Cool Z Heating Inc. did an outstanding job installing HVAC systems in all my five investment properties and 12 unit Condominium Building. 
October 24, 2009 by Dariusz Derewonko in Elmwood Park, IL

- "I have been doing a lot of home repair over the past few weeks, and my experience with CoolZHeating is by far the best experience I have had with any of the contractors. I plan on and have recommended your organization to anyone who asks me." 
- Jason K. Ellis, Evanston, IL.

 "Thank you so much for your prompt service. I called at just before 4 pm and Maciej was here before 5:30. Outstanding employee. One of the nicest, most helpful and pleasant individuals I have met in a long time. I will be recommending your company to everyone I know. Thank you again." Debra S. From, Lombard, IL.

 "The tech who arrived CoolZHeating did an excellent job. It was an emergency Saturday call and he even arrived 2 hours early which was exelent since I was in a pinch for time. My old company didn't show up on Friday ! and I am most definitely going to use your company for my future needs. Thank you." John Clark, Bucktown, Chicago, IL.

"Maciek and team did a great job on my new home addition installing hi efficiency forced air system top quality materials were used and super quiet two stage furnace, top rate job and lowest price ! Highly recommended to anyone Many Thanks ! Robert Adamczyk, Galewood, Chicago, IL. "Maciej and the crew did a very good job on replacing hot water boiler " Jason and Adriana K. Elmwood Park IL. "I had a pleasant experience dealing with your employees. They answered all my questions and were very thorough on cleanup." Barbara and Mark Batycki, Niles, IL. "I have been doing a lot of home repair over the past few weeks, and my experience with CoolZHeating is by far the best experience I have had with any of the contractors. I plan on and have recommended your organization to anyone who asks me." Jason K. Evanston, IL.

"The team was courteous and efficient. I feel very confident the installation was done exactly correct with no short cuts taken. I will definitely recommend your company to my neighbors. Adam Janowicz Winnetka IL

"Great service I received, in the repair work to my old unit, the help in choosing my new unit and the installation of my heating and air system. you have a customer for life. Marcin Szpak Antioch IL. "The service technician was very professional, gave me all of my options (about repair or replace) and no high pressure tactics were used. " Dorothy Koelle, Lincolnwood IL.