Mark came out on a holiday weekend as our AC was not cooling. He was able to quickly diagnose the…read moreproblem and repair it on the spot. Mark walked me through every step of what he was doing, and within a half an hour our AC was pumping out cold air again. I would HIGHLY recommend Collins to anyone. They truly want to help their customers and not just sell unneeded items. Easily a 5 star company!

My furnace stopped working and cold temperatures were starting to come in.. after looking up a few…read moreheating places and seeing reviews I chose Collins. I'm so glad I did. Mark the owner is honest and friendly. I felt confident in the opinion he gave me and would trust him again in the future. I'm enjoying my new furnace and humidifier without worries for the winter. Give him a try, you won't regret it!!

I highly recommend this company. Very professional, courteous and prompt…read more Our thermostat was acting up right when we needed the air conditioner on, so we called our regular cooling/heating company (been loyal customer for years) we got charged for 2 service calls and still no nothing changed. after one call to American Heating & Cooling they came out the next day, replaced our thermostat and explained the problem with the old one, he also checked our vents and our system. Everything is working perfectly now. FS lost a customer of 15 years and American gained one.

Kumar came out to my home to tune-up my furnace. He took the time to explain to me what was wrong…read morewith my furnace and humidifier. Very professional. I will definitely use them again.

We have used Popa Heating & Cooling for 14 years and have been extremely satisfied. Recently our…read morefurnace was damaged by the storms and they had to replace it with a new unit. They are extremely efficient, wonderful to deal with and knowledgeable in every aspect of their work. The owner, Pat, is a woman of integrity and conscientiousness, eager to please the clients. After the installation of the furnace was completed, she came out to our home to inspect the finished product and make sure that everything was functioning properly. My wife and I recommend this company without reservation or restraint as they are always a pleasure to deal with on every level. Cynthia & Raphael O.

we had them put a new furance in 4 years ago and have their service plan so they come once a…read moreyear to check it out they have new owner now and he having the service tech lire and commit fraud saying the furance isn't running right due to the duct work funny it has run just like it is now from day one .i hope the techs know they could be party to a crimmal act

My furnace is old! The tech, Jamie, actually took pics because he had never seen one like it. Long…read morestory short, he was able to swap out the thermocouple after breaking it down, putting it back together, and then got it lit. Believe me, it was not easy. Got it done in an hour and the price was more than reasonable. I think he deserves a raise! Couldn't be happier. I strongly recommend them!

John did a great job explained everything. He wore the proper shoe covering and face covering when…read morehe came in the house. They did a thorough job at a fair price. We will definitely use them again.

STI Heating & Air Conditioning saved me so much money! I had another HVAC company looked at my…read morecentral air unit because it was blowing lukewarm air. The other company told me I needed a new compressor for $1699 and they took only cash. After a repairman ran off with $453 of my aunt's cash, I decided I did not feel comfortable giving the HVAC repairman $2000 (with labor) in cash. So, I told him I would seek a second opinion. I called STI Heating & Cooling who were booked for the week so I made an appointment for the following week. Ted arrived on time and was very professional. He took a look at my unit (which is 42 years old) and told me I needed a Hard Start Capacitor for $173. He also checked the amount of Freon (R22) told me I might need a little. He installed the capacitor and added a little Freon and my unit start blowing extremely cold air. Ted's work was great! He told me his father had an old unit like mines and he keeps him father's unit working. I told Ted the other repairman thought I needed a new compressor and Ted suggested maybe the other repairman was not familiar with older units like mine. I am SO glad I called STI Heating & Cooling! I told Ted they are now my go-to company for ALL my HVAC activities. I would highly recommend this company - they proved to be a huge money saver for me.

The service was amazing! Customer service was very helpful and the technician provided excellent…read moreservice. And they were reasonably priced! I would definitely recommend STI Heating & Air Conditioning to anyone looking for repair and/or great service. Will definitely contact them again for future repairs and checks. :)

Called to get a quote from Siemer last year. I can't explain how professional the whole staff is…read morefrom the quote to the appointment setting to the installation it was amazing.

Talk about price gouging, charging for AC simple capacitor $300 and more, plus additionally…read moreservice call and diagnosis!! RIDICULOUS!!! Capacitor anywhere for sale is between $10-15 , on Temu can get 3 for $10, even service technician said makes no sense, but has to charge what Siemer told them. Over 3,000 % price gouging, ripoff!!! Their excuse is not many people know prices!!

This company gave us very fast and courteous service with an extremely fair price. We will…read moredefinitely use this company again.

From the owner: Spring sale here to serve you Chicago land in Northwest Indiana area northside suburbs we have…read moresales on boilers furnaces air conditioning systems exhaust water heaters condensing units high efficiency furnaces call us today Repairs sales and service

Although I did not use Centsible for my new furnace installation (I got a better deal with my…read morewarranty company) I did receive a quote and inspection with follow-up. They also mocked up pricing for a new air conditioning service too. In the future, they will get my business. Thanks!

Had new furnace installed. A technician took dirty expensive sheets of mine and put them on the…read morefloor to cut metal on top of needed for the install. They were ruined in the process. This was in 2016. Had them at my home (2025) because of AC problems that were affecting the furnace. They couldn't figure out that there were birds in the flue causing the problem. This time a technician stole an electric saw I had. Will never use these people again.