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.

It's good to meet good people, the person that I talk to in the office was very helpful said she…read moredidn't have an opening but called me back when she did, the technician was straight forward and matter of fact not only did he fix the problem but inspected the whole furnace before leaving great value and completely worth it!!!! Any furnace issues I'm calling STI first!!!!

Welp, it doesn't get much better than this. I called Williamson after trying Illiana the same day,…read morehoping Williamson good send someone right away (Illiana couldn't make an emergency call and we needed someone here before we left for work). The technician called me back immediately and stopped by us on his way to another job within 30 minutes of the call. They were in and out within 30 minutes, replacing our 2nd capacitor for $100 less than Illiana charged us for the exact same part last Summer. I am happy to be working with a small, local business, and now I'm never turning back. Thank you Williamson!

Wayne is great. He has done a bunch of heating certs and repair work for me. Straightforward, fair…read moreprices, and quick service. They work in the south suburbs and Indiana as well.

Requested a HVAC and Furnace tune up through the yelp projects…read more Quick response and got us on the schedule. They came out today and the tech was great, checked everything out. Happy with the service and would recommend to other. We will be repeat customers in the future

Timely, friendly and knowledgable repair team. Thanks for helping me out in less than 24 hours.read more

We had just moved to NW Indiana and bought a home. The air went out within 2 weeks of us closing on…read morethe house. The home warranty wouldn't cover it. Our neighbor recommended Mark Collins and his company. The store opened Monday at 7. I called at 7:15. Mark ( the owner) answered the phone. Owners answer the phone? I love it! He was very sympathetic to my needs. He apologized and said he couldn't get out there until 9:30 am that morning! That's a window of 2 hours! Dont apologize Mark- I'm beyond happy. Mark showed up as promised and gave a quote for a new unit. He wasn't pushy and he didn't try to oversell us with a larger more expensive unit. He left pamphlets of models for us to look at. We called Mark back that afternoon- we decided to have him install the new AC unit. Again, he was apologetic. He wishes that he could install it that day- but couldn't. Instead, he could install it the next day- Tuesday. He said he carried that unit in stock. As promised, Mark and another man showed up on time in a company van. They removed the old unit and installed the new one in a timely fashion. He went over all of the features of the unit and showed me what he removed and replaced. They were quiet and neat and didn't leave a mess. We turned on the AC unit and we had Air conditioning. The unit is purring like a champ! A few days later, we get a "thank you card" in the mail from Mark and Collins Heating and cooling! Who sends out thank you cards anymore.... Collins heating and cooling does! This is a very small personable company that can tend to all of your needs- night or day. When our furnace goes out- Mark will be replacing that unit too!

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!

STAT HVAC installed my furnace and AC unit in September of 2022. Every year since then they have…read morecome out to clean and service my system for free. They came today October 15, 2026 and did a 100% service checkup, not just a "beat on some things" and leave. I'm talking about vacuuming, gas sniffing, snake camera in the firebox, and even replacing the whole house humidifier filter. Gauges on the AC unit... the works. All for free. Best HVAC company ever. You could not do wrong calling this company.

From the owner: STAT HVAC - Heating, Cooling & Indoor Air Quality provides HVAC Installation, Repair & Service,…read moreIndoor Air Quality & Water Heater Installations, Repair & Service in the Schererville, IN area.

I called Siemer as a last resort for our rental property in Hammond. I had an issue with the old…read more1906 Boiler not working properly. I had already had Lovings Heating and cooling and their tech didn't even troubleshoot just looked at how old and told me nothing could be done. Then I had Earls Heating and Cooling and they essentially did the same thing. They saw how old it was and didn't want to deal with it just suggest a whole new system in the thousands. When I called Siemer and explained my problem and told them this was my last resort they asked me to hold for a moment and told me I was going to speak with the owners wife. When she came on I explained my situation and she told me she would personally make sure the technician was the most experienced with Boiler REPAIR and he would do his best to fix it or figure it out. She said he would probably be really excited to see this boiler. Well he came out and explained that it is a bigger problem but he did clean up some of the connections and tried to make it work better. This is going to be a bigger problem considering the part is encased in Asbestos. These are all things I had a feeling about. However, whatever he did to service it and get it staying on worked and now my tenants have a warmer home now. I know he didn't have to do what he did but he cared about doing as much as he could and for now has given us some time to figure out the next step. Thank you Siemer. Your customer service is what customer service and dedication is suppose to be. CALL SIEMER THEY CARE......... and not just about money!!!!

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!!

I had a great experience with this HVAC company from start to finish. My technician, Mauricio, was…read moreprofessional, knowledgeable, and incredibly courteous. He took the time to explain everything clearly, answered all of my questions, and made sure the job was done right. It's obvious he takes pride in his work and genuinely cares about his customers.

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!

fast and efficient service. Quality work. Very knowledgeable staff. better than fair price…read more Thanks, Mike and Jeff!

Without a doubt call Naughton for HVAC needs. They were friendly, helpful, and the service was top…read morenotch. They came much cheaper than I was quoted from another company and a repairman was here in 15 minutes.