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.

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.

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

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.

Natalie Gentz came to do annual maintenance on our furnace. She came on time and worked quickly…read moreand efficiently. Highly recommend. Thank you!

We had some issues going on with our 14 year-old furnace. I immediately looked at the reviews from…read moreO&W heating and cooling. And I was very impressed by all the reviews all five stars. So I thought we would give them a try. Excellent service! He arrived on time and showed me everything that was wrong. Turns out all it needed was a cleaning of some wires and a condensation tube was completely frozen which he took care of immediately. He also took the time to discuss with me of something that needed to be done in the future regarding our unit. Omer was extremely trustworthy and honest! Also the price was extremely reasonable!!! My husband and I were extremely happy with this company and will definitely use them in the future as you should too.

Fully appreciate all the amazing and high quality service! From a new water heater to a new…read morefurnace, it's been nothing but outstanding service!

Can't say enough good things about Gregg Heating and owner Kyle. Replaced my furnace back in…read moreNovember. Excellent workmanship. Now my old AC unit didn't start up. Called Gregg Heating. Kyle showed up the next day and found a mouse nest. He cleaned out the unit and did some rewiring to get it going. Also let me sign up for their awesome maintenance plan for $280 and counted this visit as the AC inspection. No additional fees. Integrity is a dwindling characteristic these days. Kyle and Gregg Heating are honest, fair and full of Integrity.

Was reliable place that did good work under old owner. Now…read moreit has a new owner, and I had a phone call in to them a few days ago that was never returned. This is a sign of unreliability when a company can't even return a call. I'll look elsewhere for my HVAC needs.

Tom to the rescue, again! I've been working with Tom's Dependable Heating & Cooling for over twenty…read moreyears now, and he continues to be the best service person I've ever had. My A/C wasn't blowing cool air. Tom was as dependable as ever, got it fixed immediately, and with his usual warmth and smile. I couldn't recommend him more highly! Tom and his team are definitely "dependable," but it seems such an understated word for the wonderful service we get every time we need them!

Honest, responsive and a genuinely great guy. We've been customers of Tom's for 25 years. He's come…read moreat 4 AM on the coldest night of the year to repair our furnace quickly. He's been here on hot days to repair our ancient AC unit. I hope he never retires. Thanks Tom!

I have used Action Electric twice. Both times the service tech, Dan, was immediately responsive,…read moredid a thorough job, and everything was resolved promptly. I cannot recommend their company enough, and I am an easy-going, but picky, customer!

From the owner: Electricians HVAC Installations…read moreLicensed and insured

They tried to charge me 600 dollars for a thermostat. I purchased the same thermostat for 100…read moredollars. They are ripping people off. I paid 120 dollars for the service tech to be here for 5 min and they wanted a total of 740 dollars for the call and thermostat. what a joke!! 500% mark up. ridiculous. manager was not helpful. and did not care what so ever.

Furnace died during a cold snap. NEw Berlin was out within two hours to diagnose problem-needed new…read morefurnace! Gave us 2 space heaters and were back early next day To replace furnace. All the techs were courteous and efficient and respectful of property. We got a fair price that included discounts and are now enjoying a toasty warm house again. Great service. Highly recommend.