Scheduled him to come out in a week in a half to help finish our shed. He had a family emergency…read moreand then we rescheduled a few days later. Said he will be there and getting no responses. Not sure what happened?! More upset that he wasted 3 weeks of me waiting on him so paying for another month on the storage unit.

Called Brian to do a few handy items around the house, he was in and out within one hour. Thanks…read morefor your services.

(I'd give them 100 stars if I could!)…read more We met Jason earlier this year while purchasing a home that needed a total rehab. We were ready for him to replace the entire HVAC system right away, but because of his experience with rehab homes, he advise us to wait until all the dust settled first -- a very smart suggestion. Here's where you really see how much he cares about his customers: Jason told us about upcoming changes in the HVAC industry that would make new units more expensive. He suggested we buy the unit early to lock in the lower price, and he even offered to store it for us until we were ready for installation. Six months later, when we were finally ready, we coordinated everything with Laura, and the timing couldn't have been better. Jason and Cory also handled our whole-house vent cleaning -- and thank goodness we took his advice to do that before installing the new system. His team showed up right on schedule, worked efficiently, and did everything as professionally as possible. The entire experience was smooth from start to finish. Highly recommend -- truly a 100-star service!

Bill Campbell- My Honest Accounting of My Experience My…read moreexperience with this company has become a credibility issue more than anything else. I was told I would receive a text when the technician was on the way -- that never happened. For them, that seems to be "no problem," but for me it meant I had no chance to be present, observe the work, or verify anything firsthand. From there, the story kept changing. I was first told the technician ran the furnace for 10 minutes, then later that he ran it for almost an hour, and now I'm being told it was 48 minutes but they round up. These explanations cannot all be true, and the constant shifting makes it hard to trust what actually happened. When I arrived shortly after the technician left, the furnace was running with no heat, the same intermittent failure pattern I've been dealing with all week. Nothing was diagnosed, nothing was resolved, and the system was left in worse condition than before. When I spoke with the supervisor, I was offered a return visit -- but only if I paid another service fee and hourly rate. The suggestion was that "we can watch the furnace all day," but at my expense. Meanwhile, I was already charged for a full hour even though the technician was reportedly there for 48 minutes. If they're rounding up, it raises the question of whether I'm entitled to the remaining time I paid for. At this point, the pattern feels less like a repair‑focused service and more like a replace‑the-unit operation. When a company can't keep its story straight, doesn't follow through on basic communication, leaves the equipment still failing, and immediately pivots to more charges or the implication that replacement might be the next step, it's hard not to feel like the goal is selling a new furnace rather than fixing the one I have. This is simply my honest experience and how it comes across from my side.

Since one star is the lowest ‍This business is is HORRIBLE. Too bad it cost me $1600 later. Long…read morestory short, he installed what appears to be a mobile home coil unit in our 2800 sq. ft. home AC unit. Now, less than a year later, needing a brand new Coil unit. I have a made several attempts to have him Right this Wrong, but honestly I do not trust him to lay another finger on my home. Our new HVAC consultants C and K Heating & Cooling for the detailed inspection.

Brian was at my house within 2 hours of me calling him, he knew that a cold house in this cool…read morefront was a priority. He not only answered our questions but made helpful suggestions. He valued our position as military homeowners and where we stood with the equipment we had and the timeline of us in this house. The fee was very reasonable. Finding responsive, reliable professionals has proven difficult since moving here and I am happy to have Brian in my back pocket moving forward.

When it comes to home HVAC systems (indoor/outdoor) Sean Murnan of Ambient Air is the way to go. He…read morehas great, low & affordable prices on cost effective equipment. That will not only save $$ on your electric and gas bills but will also improve your overall health and well-being. 5/5 stars and thanks for the great work!!! - Corey

I've dealt with a lot of HVAC companies, and this has been the smoothest experience I've ever had…read more I've used Ambient Air three times now for both my own system and a tenant's. I'll never use anyone else.

I have to say that this company has amazing people working here. And the owner Kaycee don't mind…read moregetting his hand dirty to get the job done. His workers have no bad words to say about him or his company. And what I really like is they don't have you waiting all day they give you a time and they are on time if not they will call and let you know. I have nothing but good comments about this company I recommend everyone to use XCELL Williams.

Friendly & thorough. They have been our go-to source for both our home and commercial office…read morebuilding we own. Don't look anywhere else for HVAC service or installation. Williams is THE BEST IN STL.

I would like to just say how wonderful this company is. When we talk great customer service which…read moreseems to be rare these days, Josh and his apprentice are of the highest standard. Straight to the point, friendly and makes sure that his quality of work is of the highest standard. Thank you Josh and looking forward to have both HVAC and Furnace serviced in the future.

Josh was prompt, knowledgeable, and friendly. Same day service when our AC and fan stopped working…read more Thankfully it was a quick fix and the price was very reasonable. Definitely will be using again for future heating/cooling issues.

I was really pleased by the process for getting our AC replaced. Matt worked with me on a bid for…read morethe new unit in October, and spoke intelligently about the options, where other companies did not seem as educated on the components. This bid was actually less than the competitors, and they had not been around as long as Harster! It was an easy choice. We scheduled to do the replacement in January. Jim and his team came out to do the install and addressed some additional needs to increase the air flow, make the existing unit up to proper code, and make the filter track so it fit filters appropriately. The last unit installation I'm sure was a DIY job or done by a less qualified company. Jim addressed all those issues. I was on a meeting when he was all finished and didn't get to go see the finished product until after he left. It was beautifully done and very neat.

Harster Heating and Cooling just left my house and I could not wait a second to write a review…read more This company has superior service and timeliness. My furnace stopped working and I called Harster after reading the other reviews on Yelp. The receptionist was very nice and she had a technician out in less than 2 hours. I ended up needing a new system, but two of the nicest and most informative technicians came out the very next day and completed the work. They talked to me about the system and what I can do to maintain it. The price was fair and what they quoted originally did not change after the work had been done. I would recommend this company to anyone.

A very nice fellow; he could not diagnose the squeak in the 2 yr. old faucet. Instead he cleaned…read moreout 2 aerators and charged us $175.00 plus a $49.00 service call. Very very very expensive - I had read several reviews and really thought I had made a good choice. Please be careful!!

Very expensive service. Charged $500 to fix running toilet. They charged us for 3 hours while guy…read morespent 1.5 hours on the job.