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.

Our air conditioning unit was leaking on the basement floor and after a call to Weyer & Sons an…read moreappointment was scheduled for a few days later. They are extremely proactive in getting to you sooner rather than later, so only a few hours later after a customer cancellation, the repair was made and we are up and running smoothly. Weyer & Sons is the only company I have used to service our air/heating needs, and they deliver with fast, friendly, and honest service at a very fair price.

Got to love Weyer and Sons.We have been using them for 18 years.Best family ran business.Honest and…read moreefficient. Karen Gibbs

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

Bill uses top quality equipment and installs it with A-1 workmanship. Pays attention to the little…read moredetails, leaves job site clean.

Bill is a great service technician. He was here for an AC checkup, but he kinda put on a class as…read morehe stepped me through what he was doing, as well as pointers in how to develop a better draining HVAC system. Bill is now my go to HVAC technician for all needed services.

Thielmann: I'll try to give a brief background. The furnace (unit also has AC component) in my…read morecondo was having white smoke/steam come out of the external vent during some of the extremely cold weather we were having. Even though my furnace was not making any unusual noises, smells, or setting off my carbon monoxide detector, I was still concerned as no other condos in my building or nearby buildings were having the smoke/steam. The employee that initially inspected by furnace (Carlos?) informed me that the heat exchange was clogged and would require me to repair the furnace or purchase a whole new unit (I opted for a whole new unit based on its age). Carlos gave me the impression there was no rush and that it was not something that necessarily needed to be done immediately. When the second employee (Dave?) came later that day to take measurements and verify the replacement unit needed, he made it seem almost emergent and began to wonder aloud if he needed to shut my furnace off that day. The stark contrast between the two was alarming and created a bit of a trust issue on who to believe. Carlos seemed a little green and Dave seemed like more of a veteran. Dave eventually determined it did not need to be shut off as no carbon monoxide was entering my condo. The whole experience did create a bit of a panic for me though, so I quickly accepted the only available appointment within the following two weeks. It was convenient that they could get it replaced just five days later, but if it truly wasn't an emergency then I would have liked a little more time to verify I was getting the best price as it wasn't cheap (to give you an idea this is the largest purchase I've ever made behind my home, education, and car). They do offer payment plans that were easy to enroll in, one of which has 0% interest if paid off within a year. I'm not trying to throw anyone under the bus, but I can tell they really want an honest review as I've received multiple texts and emails asking to leave one. The crew that showed up on the morning of 12/24 to install the new unit were quick and efficient. They were respectful of my property and explained the new thermostat to me. All the employees were friendly, including the ones running the office over the phone (Micah?).

Thanks to the flooding my hot water heater is shot! I called Thielmann (since they previously were…read moreRoss and that was the service I use to use) they came out to inspect my pilot light situation and unfortunately just the inch of water I had is the right amount needed to short circuit things. He also made sure to check out my furnace to ensure there weren't any issues with that - I knew the AC was working fine but he ran a service check on the heat as well. I am a little confused as to what's happening for the next appointment I've set up - is this to gain an estimate on a new heater or to actually install one which is the reasoning for 3 versus 4 star. Tried calling back to find out but couldn't get ahold of someone. I'd like to get a few quotes of course for something like that/have a discussion about the types of options for water heaters.

Highly recommended. These guys will make sure they fix the problem. They don't continue to charge…read moreyou for service calls if they need to come back the next day. And they do come back the next day if it isn't 100% fixed. They are very nice and timely. Will use them for years to come.

Have used this company twice in the past year. Appointment was quick and on time. Service tech was…read morevery informative and friendly. Prices were better than expected. Happy to recommend them for you Heating and Cooling needs.

Joe did our annual service this year and was excellent, as Nimmer always has been for us over the…read moreyears. We have multiple units that are impeccably serviced and maintained by their technicians. They always let you know when they are on the way, are always on time and always provide a name and photo of who is coming. If you are hesitant to try a new service, I recommend this one. We first tried Nimmer years ago and haven't used anyone else since.

Nimmer has been very helpful and flexible with services, when my furnace blower was dying and with…read morereplacing the furnaces and ac's. The technicians have gone above and beyond, especially Pat and Josh. My house is crazy, and it presented problems that weren't expected, and they came up with solutions to those problems. They have been wonderful to deal with (office staff Malinda and Beth, and Brian who gave me a quote for new units as well as Pat and Josh). I highly recommend them.

i had a great experience thanks to technician Jose Rivera. Friendly, knowledgeable and patient…read more Took the time to explain things to me and answered all my question. Did a wonderful job from start to finish.

Joe is so thorough and professional, explains things simply, and answers all questions…read moreknowledgeably. I don't think I've ever dealt a service tech as kind and respectful. Before the appointment, I was hoping that he'd be "my" tech. We did discuss a possible add on for air quality, and he left information about it to review.

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.

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!