I just really appreciated what seems like an honest assessment. I was looking for a second opinion,…read morebecause two other companies had recommended major, costly repairs or replacement for my gas furnace. The Grenz folks came, carefully looked at the unit, and said, "If it were my furnace, I wouldn't do anything. It is running the way it's supposed to." This second opinion cost me something, naturally, but it also saved me between $5,500 and $19,500 (two quotes from the other two companies). Jim seems like a straight shooter. I'd recommend you give these folks a try.

He called me back and talked me through the fix. He did not wait to come out and wouldn't take any…read morepayment for his assistance. He clearly knew what he was doing. He was able to talk me through several troubleshooting exercises without seeing the gas fireplace itself. If I have any HVAC or fireplace needs in the future, I will definitely use Grenz

We called Pat's to diagnose and repair our boiler, which decided to crap out on us on a Sunday. The…read moretech, Michael quickly gave us a call back, and within an hour he arrived at our place. Michael not only diagnosed and repaired the boiler in record time, but he was also kind enough to take the time to thoroughly explain how a hydronic heater works, and all of the necessary maintenance involved. Michael was extremely knowledgeable with all things HVAC. We were charged a very fair price for the labor, especially considering the weekend callout. Fast forward a few weeks, and we called out Michael to update some of the heater controls. Again, Michael provided outstanding service and corrected a few other issues with our hydronic system. Still highly recommended!

Update 4-14-2026 To finalize this exchange and summarize…read morePat's treatment of my family and I. I have been extorted by Robert, accused of fluffing the bill, and essentially told that due to Pat's mistakes I am no longer welcome to use the service. This last part is verifiable in the response given to me. To whomever is above Robert I want to clarify how this situation was 100% caused by your company and now I am being painted to be the villain. If you pull the phone record you will hear that my family and I never once asked for a discount. In fact Robert was adamant he make it right and reactively (as this was after the first screw up) offered to take this job on the chin. I encourage you to ask Michael, as he is a super honest employee of the conversations we had with him as he made a mistake and misquoted. I assure you he will be nothing but truthful regardless if he made the blunder. With all this being said I am now not welcome to use your service according to the Google commentator. For that I am bummed as the workmanship, when Pat's does show up has been historically a class act. I have contacted the BBB, and Angie's list due to the extortion and treatment by Robert and Pat's heating as a whole. I do not care what the outcome is but to sit back and be bullied due to Pat's mistakes, and Robert's incompetence is absolutely ludacris. To the owner, if you want to make right terminate Robert's employment and I would be more then willing to continue business as my family has done so for the last 20 years. Robert has done nothing, and I mean nothing to make any of this experience pleasurable. Even eating the job, which your team did as Robert promised, came at the expense of extortion, and painting my family and I as the villain. I must say that the treatment of my wife and dying father (the one sitting home waiting for Pats delaying treatments to be available) lead me to get involved. The owner is welcome to call my dad and he will give you my number. I will not discuss anything with Robert as 99% of these issues came from his failed management. To any users reading this know I do this to show you the caliber of people Pat's employees. In the unfortunate event an issue does arise that is out of your control it is evident Robert will say whatever it takes to try fixing the solution but do minimal to help. A liar is a liar, beware before making any Deals with him and I will encourage anyone to get anything he says in writing to expedite the back and forth I had to do to get him to honor his commitment.

Used Aasen Heating & Cooling for new construction with in-floor heating, dual zone furnace and air…read moreconditioning. Everything was done with great attention to detail and everything worked flawlessly. Also, the price was competitive with other bids. I would definitely recommend using their services for new construction, maintenance or repairs.

From the owner: Aasen Heating & Cooling provides services for heating, cooling, fireplaces, air quality,…read morehumidifiers and more to Oconomowoc, WI and the surrounding areas.

They were recommended by a friend of mine, and they were both very inexpensive and prompt. They…read morereplaced my furnace and air conditioner, replaced the condenser outside and helped upgrade our ductwork. Mark is really nice and I trust him implicitly.

I had Mark's heating quote a project for me along with 5 other competitors. To start things off,…read morethe person that answered the call was helpful and thankful for the opportunity. Mark made himself available to my time so he could stop by and understand the project. His quote came back quickly and he was able to start work in a reasonable time. He always returned phone calls and was a true pleasure to work with. Mark's work quality is excellent AND his prices were the best I found! Excellent Job Marks Heating!

This business advertises "up front pricing", NOT TRUE. Had a service call to address a loss of…read moreheat. A slowly failing inducer motor was diagnosed. The tech, "made adjustments", got the furnace to ignite, and refused to tell me how. He then consulted with his boss and returned with a $496.00 bill. This is about 3x the amount of a common service call. He added that they would apply the $496.00 to the price of installing a new inducer motor, or a new furnace. Making the installation of a new inducer motor $904.00. I spoke with a supervisor who said it was more than a service call because "adjustments" were made, and the heat is now on. I consider this very sneaky and out of line. They never told me this service call would be $496.00, or any price for that matter. It was a sneaky rip off that the consumer should be aware of. I should have paid no more than $200.00 for that service call. Future customers should be aware of this tactic.

We had our air conditioner serviced by Jose and Donovan. They were respectful and prompt. The…read morecommunication was informative and they did a great job. We really appreciate the excellent service we get from Airserv.

Very knowledgeable serviceman who answered all of our questions. Very professional yet with a…read morepersonal touch. Was truly interested in our specific concerns and questions. Did not take long to arrange an appointment. Offered suggestions on best way to set and regulate our furnace. After many years with another company that we've learned to distrust, a change was necessary and Donovan & Jorgensen definitely left us with a very good impression.

Just wanted a ballpark quote on my boiler that's working but acting up. To start they demand info…read morelike address and a phone number straight out the gate, I'm sure it's so they can harass me later with "do you still need" calls a week from now and when you give it you find out they charge $100 just for a diagnosis. Don't waist your time They clearly don't want the business.

My furnace went out yesterday (Friday) afternoon, and I called him last night. He said his day…read more(Saturday) was booked but if I was up early enough he could be here by 6 am. He was here promptly at 6am and fixed the problem in under 30 minutes. He was very professional and had incredible rates. This is not service you see anymore. THANK YOU SO VERY MUCH FOR OUTSTANDING EARLY SATURDAY MORNING SERVICE AT A STEAL!

The best service i have ever gotten by far. Im a landlord and have been since the 1980s. I have…read morebounced around to many different Hvac companies over the years as i never was really happy with any of them. Then i found a+ the fix about 5-6 years ago. Every time i have called them they are there pronto. Often in just a few hours. They know what they are doing too. They offer low cost options often. They arent just parts replacers looking to jack up a bill. I will never call anyone else.

Incredible service all around. The staff are so communicative and friendly - it's as if they are…read moreall owners of Droegkamp! Since helping us with a furnace issue during the great freeze of 2025, we have been using them since. Our family won't look to anyone else now.

We have used Dave Droegkamp for several years. In 2020 we purchased a new furnace from them and we…read morehave had it serviced by them since. We had a minor issue with it not starting this season and Dave B. and DeShay came to our home and promptly fixed the issue. They were professional, explained the issue, and cleaned up after they were done.

Tom misquoted work I hired him to do. He gave me a quote, showed up for the job, realized he didnt…read morepay enough attention (he overlooked my basement ceiling being drywalled ) He started the job but decided after cutting three vents holes in my floors that he didn't want to finish the job he misquoted. Than he sent Elizabeth his admin person to do his lying for him. They now demand i remove the entire ceiling and verify there is no mold or asbestos before they will return. We discussed the condition of the basement, specifically that there is soke mold and likely asbestos wrapped pipes. The morning he arrived to do the job he immediatelyadmitted he screwed up. He assured me he would do the work anyways as it was his mistake. Now he won't respond to messages sent directly to him, and Elisabeth is like dealing with a child who will not admit they are wrong. Despite the very good reviews, it has been a nightmare trying to get this company to follow through with what they said they would do. I strongly recommend you look elsewhere for your work.

Tom Yodor maintains the HVAC equipment in my home. He does a terrific job, and is very…read moreinformative so that I can plan work in the future. This past Monday he installed a new Honeywell T10 Lyric thermostat. He tied this in to my existing bypass humidifier to automatically control it to minimize window sweating in the summer. The new controls required a new wire to tie the thermostat to the humidifier. Tom efficiently ran the wire from the main floor to the basement. The T10 can also control via remote sensors to assure adequate heating and cooling. I am very happy with the thermostat, and how the system operates!

I worked with Droegkamp to have a heating unit added to my garage. They came out and discussed…read moreoptions for the unit, its placement and how best to run the utilities to it. Once the unit came in, the installation crew did a great job getting things up and running and cleaning up the work site. Really pleased with Droegkamp!

Company installed all my HVAC equipment when I built my home 5 years ago. Quality work, friendly…read morepeople. Also thorough routine service. Highly recommend.