This company does not disappoint! Great knowledgeable technicians. There are a lot of choices,…read morebut this company is the greatest!

Hello - My name is Carly W…read more I have used this company omg- SO SO MANY TIMES. No one is better. They are QUALITY. We own over 800 rentals, we also are building out a hotel and even my own home. I use them for everything. The money you spend, is well worth the quality you get. I am grateful for this company, many contractors are SKAMMY- I can assure you, STAY COOL is not one of those. This is someone you can TRUST. And I trust no one, so that is a lot coming from me. 10/10 HIGHLY RECOMMEND! -Carly Whiteaker

these guys are the best ! didn't think they would show up on…read morethe scheduled day to install our new ac unit and furnce because it was raining...8/6/26. but @ exactly 8:00 a.m. on the dot they rang my door bell and...this is what we got friendly 5 stars prfessional 5 stars quality of work 5 stars need hvac services look no further in 2026 what a pleasure to deal with a company like this

This company is fantastic. AC went out Sunday afternoon, call Stevenson HVAC, they responded…read moreimmediately. On our doorstep 930 Monday morning. Had it running in 30 minutes. We also learned it was 26 years old, so pics were taken of AC/furnace and 6 quotes sent to us. We chose the middle of the road system, they were here Wednesday morning at 8 am to install. Estimated their installation time as 8-9 hours, but fortunately done in 6, as 15 minutes later is when all the storms and tornado warnings hit. The system is crazy efficient, we are so pleased with our choice. This must be a great company to work for, every single person we have dealt with has been friendly, professional, and has explained everything in detail. I am so impressed with this company, definitely a 10 star rating!

Jeff was very helpful and respectful he went out of his way to help us with everything that we…read moreneeded he was here on time he explained everything very well and just all around a great person to have working on your furnace and air conditioner he went out of his way to help us in every way thank you Jeff I refer anybody and everybody to use illy hvac

From the owner: Whether you're dealing with the heat of summer or the chill of winter, you depend on your heating…read moreand air system to keep you comfortable. When unexpected problems strike your home, turn to Illy HVAC in St. Peters, MO. This locally owned and operated HVAC contractor carries more than 30 years of experience in the field. Their talented technicians take pride in offering custom solutions, affordable rates, and excellent customer service. As a trusted HVAC contractor, this hometown team will exceed your expectations with timely furnace and air conditioning repairs. Seasoned technicians use the latest technology and years of expertise to fix issues with blower belts, flickering pilot lights, and worn-out ball bearings. No matter the make or model of your system, they design a personalized plan that targets the source of your troubles. If your furnace or air conditioning unit is beyond repair, take advantage of Illy HVAC's reliable installation services. Residential clients will enjoy access to energy-efficient products from Coleman®, a name-brand manufacturer. You can also pair your investment with a separate 10-year warranty plan. Routine maintenance is available on an annual and seasonal basis. Knowledgeable staff members will arrive at your home to conduct in-depth inspections, remove dirty filters, and update broken thermostats. Feel free to ask them questions regarding air purification devices and humidifiers...

Very great service overall but following up after an AC repair to ensure the fix was done right was…read moreabove and beyond!

Had a bigger Hvac company start servicing my new homes unit- the AC stopped working- the guy came…read moreover and said "it's an electrical wiring thing, but I don't have time to figure out what's wrong. It's too complicated. You need a new system anyway- it's old" said I needed a complete replacement because they can't service my air conditioner anymore - wanted to sell me a $10k unit. Branden came over and did a long look at my unit and agreed that it was an electrical thing- apparently he WAS willing to figure out what was going wrong- got it going again and said when it stops working again to call him so he can figure out where the wiring needed replaced. Spent a long time at my house. Well, it went out a month later and he came over and did everything he could to figure out where the wiring problem was. Took a couple visits and lots of trial fixes. Said he could service my AC just fine in the future and fixed the issue- everything working again. He also has lots of options for when I do need to replace my older system- but it's not now. Very conscientious, very knowledgeable and very patient and tries very hard to fix the problem without taking shortcuts and not wanting to do the work cares more about the customer than making a big sale.

Jerry Kelly installed our new HVAC System in November 2017 and has been taking excellent care of us…read moreever since. Today their very personable technician, Dillion came out to check, maintain and clean our A/C unit. Dillion did a great job, very professional, friendly, engaging and thorough. We truly appreciate everything Jerry Kelly does. We highly recommend them for your heating and cooling needs.

In Sept 2026, during extreme heat, a Jerry Kelly technician diagnosed our non‑working A/C as having…read morea seized compressor and said repairs would exceed $6,000. We were then given a handwritten replacement quote on notebook paper with no brands listed and only vague "standard" vs. "high efficiency" categories. The quotes ranged from $19k-$23k, and we were pressured to make a decision immediately. When we said we planned to get other quotes, the lowest price suddenly dropped to $14k -- an immediate ~30% reduction that made it clear the original pricing was heavily inflated. Our home was over 90 degrees inside, and the only option offered was next‑day full system replacement. We called another HVAC company for a second opinion. Their technician found no seized compressor -- just a failed capacitor -- and repaired it within minutes for a couple hundred dollars, restoring cooling within an hour. He also arrived with a portable A/C unit to ensure our comfort if the repair wasn't possible. Jerry Kelly did refund our diagnostic fee and Maintenance Club membership after I contacted them, but consumers should be aware of the high‑pressure sales tactics, questionable diagnostic practices, inflated pricing, and the importance of getting a second opinion before agreeing to major HVAC repairs or replacements.

We had a 3 Zone Fujitsu Mini-Split installed for the upstairs of our house that get really hot in…read morethe summer. The bedrooms would get super hot and it would be unbearable to sleep. Now that we have the system it is a whole lot more comfortable. The install went great! It only took 3 days and at the end the only sign of them being there was the units mounted on the walls. Alex always came on time and had a good crew to get the job done. It did not interfere with our daily living when Alex was here. The whole system was definitley worth the money! The whole crew was very polite and answerd all of our questions.

From the owner: Calumet Cooling has over 20 years of professional HVAC experience. Our technicians are licensed…read morejourneymen in both St. Louis and St. Charles counties. Trained in preventive maintenance, emergency, and regular repairs, our technicians will keep your equipment operating at maximum performance and efficiency. With a thorough understanding of HVAC-related regulations and building codes, we conduct all services using the highest industry standards. Our technicians have received extensive training and will provide quality repairs with exceptional professionalism and customer service - all at competitive prices. Call Calumet Cooling today.

Great experience and results. Dan was on time and professional. He was extremely knowledgeable,…read moreand went above and beyond, really nice guy and did a great job installing my faucet, even gave me some tips about it and the dishwasher. He made sure all of my questions were answered, and everything was tested before he left. Will definitely call them for future work. Recommended!

Replaced water heater. Quick and efficient. He was very nice and professional. Would highly…read morerecommend.

Called this morning and they were able to fit me in today for a service call. Their technician…read morediagnosed the problem as being a bad circuit breaker and not a furnace issue at all. I appreciated the honesty! He had to leave to get a new circuit breaker and came right back to replace it. I'm happy with the service - prompt and courteous - but I am not thrilled with the high cost. The service call was $89 and a new circuit breaker should cost only $20-$30. I was charged $331.50 total, which I've been told by neighbors is very, very high for such a simple fix...Oh well. At least my furnace turns on now.

We have used Classic Aire for almost nine years and have had service calls and twice-yearly checks…read moreover the years. A new HVAC system was installed in our home in late March this year and everything was done professionally and neatly with no messes left for us to clean up. The system worked great until the incredibly damp and cool spring when the AC was having real trouble dealing with the humidity in the house. But Faszold--and its mother ship, Classic Aire Care--kept sending out a couple of stellar technicians to check and adjust the system until they got it right. And this was warranty work--we did not pay for anything as they tweaked settings and made the system work in our home. Anthony and Steve are true problem solvers as they continued to address individual parts like the thermostat and fans and they finally got it all worked out so that the system is able to keep our house below 50% humidity. It was a frustrating time but the company has been responsive and supportive. Mike Faszold was also amazing and continually answered my calls and texts during both pre-sale and after install time. This company stands behind its installs and comes through on its promise of good customer service. Check around but believe what they tell you.

Alright, I will say they requested to send out a tech who came and resolved the wiring issue. I…read moreappreciate their efforts to make it right. Maybe these guys are turning the corner.

In November 2025, I called this company to inspect my AC/heating unit. The technician upsold me on…read morea heating and cooling maintenance package, explaining that it was the best thing I could do for the unit, so I purchased it. He also told me I needed new filters, which I went out and purchased, and he installed them. He was very friendly, so I felt confident that everything had been taken care of. Since it was winter, we only used the heating portion of the system, and it worked fine. We had no need to turn on the air conditioning until two days ago. When we finally turned on the cooling system, we discovered that it was not cooling at all. I contacted the company because it appeared that either the cooling maintenance had not been performed properly or it failed to identify an issue that already existed. If the cooling system had been inspected as part of the maintenance package I paid for, I would have expected any needed repairs or replacement parts to have been identified at that time, especially since the technician had no problem recommending and selling additional items during the original visit. When I called, I was told that I would need to pay an additional $99 service fee just for someone to come out and look at the unit. I explained that I had already paid over $200 for a heating and cooling maintenance package and wanted to understand why I was being charged another fee when the cooling side of the service had not resolved or identified the problem. Instead of addressing my concerns, the representative raised her voice and repeatedly told me that the only way the company would come out was if I paid the $99 dispatch fee. Based on my experience, this company's business model seems heavily focused on upselling and generating additional service charges. I would not recommend this company and believe customers should be cautious before purchasing their maintenance packages.

I have been using Welch for approximately 5 years now. I had left my previous company due to…read moremanagement changeover and merging with another company. A neighbor recommended Welsch to me and I could not be more satisfied . I have a big home with 3 air conditioners and 3 furnaces, so I rely on them to keep working. Colin is our service person, and he is "the bomb". He is always on time, extremely good at what he does, very very thorough, and respectful to not only my husband and I, but treats my house respectfully also. I have one unit in the attic, and he never complains about crawling up that ladder in the heat to check it out. My pricing is a bit more due to the number of units I have, but the quality of service and respect is so worth it. The office staff is very organized also, and always kind /nice when scheduling or troubleshooting a problem.

So this is not my usual review but there is NO WAY I can't brag just a bit on this local business…read morethat is just outstanding! I've used Welsch for over a decade and my family used them before that. So my experience runs deep. First thing you should know: their technicians stay. Meaning you benefit from their experience and commitment to Welsch's service standards, which are high. Recently, I had a blower motor go out. Jeremy came out within the hour (after hours), diagnosed the problem and had Scott on the phone to check inventory. It wasn't easy but Scott was on the phone at 8 AM, ready to set up an appointment to install the motor - less than 12 hours later! Incredible. Look, you might find cheaper but you won't find better service, more knowledgable technicians and an overall feeling of "We got you!" like you do with Welsch.