Hours
About Us
RESIDENTIAL / COMMERCIAL / LIGHT COMMERCIAL SPECIALIST
Grenz Service Company is a Waukesha and Jefferson County area favorite, bringing friendly, dependable heating, cooling, and commercial refrigeration solutions to businesses and homes. Led by Jim Grenz, Jr. and Jim Grenz, Sr., our family-run company provides expertise, integrity and a personal touch. We specialize in: - Commercial and residential service on all makes and models - Air conditioner and furnace repair - Maintenance on all brands of air conditioners, heat pumps and furnaces - One-stop installation and service on all commercial refrigeration equipment, including walk-in and reach-in freezers and coolers, back bars and ice machines - Gas fireplace service and maintenance Our helpful, continuously-trained staff is always on standby to answer any questions, and we offer the proven quality of top brand names to ensure that you get the most performance, value and peace of mind possible. We are an independent dealer of American Standard Heating & Air Conditioning products and excel in their installation and service. Expert Solutions. Reliable equipment. Easy-to-talk-to people. For heating, cooling and refrigeration that delivers lasting results, you've got friends at Grenz!
Our Services
- Air Conditioners
- Air Filters
- Boilers
- Commercial Refrigeration
- Ductless Air Conditioning
- Ductless Mini Split
- Furnaces
- Gas Logs/Fireplace
- Heat Pumps
- Ice Machines
- Indoor Air Quality
- Zoning
COUPONS
Local Reviews
First rate customer service.
Janelle - Johnson Creek, WI 53038
Fast and efficient team with amazing customer service!!
Marvelous company!
John - Delafield, WI 53018
The Best! Beyond trustworthy!
Tim - Oconomowoc, WI 53066
I’ve continued to use Grenz for several years and they never disappoint. Good, honest, hardworking, reliable and knowledgeable are just a few words I don’t just throw around. Jim and all of his employees are good people and beyond trustworthy. To say I trust them is an understatement. I don’t trust too many people. I trust Grenz in my home even if I’m not there. If that doesn’t say something, I don’t know what does. Thanks again Jim for all you’ve done for us!
100% Confidence in them
Andrew - Wales, WI 53183
Our air conditioner and furnace were 30 years old and both went out around the same time. Luckily my father in law gave me a good recommendation to call Grenz. He had hired them in the past and had great things to say. I can see why he said those things. They installed a brand new furnace and A/C all in one day. We got a quote from another company before hiring Grenz and they made no mention of needing to change and upgrade some of the duct work so that way our huge purchase isn’t hampered by the ducts. We then asked Grenz to give us a quote and I was so impressed with the attention to detail, use of actual math and measurements to determine what is needed for us, and the clarity it was communicated with so we could clearly understand what we need to do. I have 100% confidence they installed everything as well as you’d want a company to do. They were extremely courteous, smart, and professional. They also respond to any questions as quick as I’ve ever seen a company respond. The time in between the quote and actual install was super quick so that we weren’t left being sweaty and uncomfortable until they had time to do our job. Overall I have only great things to say about them and their work. It’s a father and son operation and you can clearly see that this is their life’s work based on the care and attention to detail. I’m glad we gave our business to them and will be giving it to them in the future for anything HVAC related.
Excellent experience beginning to completion
Jethro - Neosho, WI 53059
On time, on budget, helpful, competent, efficient. Clearly a cut above.
Great service, very efficient!! Great guy!!
Cheri - Oconomowoc, WI 53066
Excellent service!!
Great & Quick Service
Adam - Ixonia, WI 53036
We had our igniter go out in the middle of the night on a -14 degree day. Our house got very cold and I called Jim first thing in the morning and he was out right away fixing the issue. Would definitely use Jim again and highly recommend him.
Polite, responsive service
Andrew - Pewaukee, WI 53072
Great service!
Joe - Delafield, WI 53018
Jim installed a new remote system for my gas fireplace. He was quick, knowledgeable and very friendly. I highly recommend Grenz.
Awesome Service!
Dalaine - Waukesha, WI 53189
Professional, fast, thorough, and accurate! I highly recommend them for your fireplace servicing. Very knowledgable and efficient.
Exceptional Service
Michelle - Hartland, WI 53029
Jim came out to tune up our 2 gas fireplaces yesterday. The service exceeded my expectations—found a small gas leak (yikes) & addressed it, replaced the starter (part was free) and Jim graciously shared is knowledge to help me maintain the fireplaces for the future. I definitely recommend Grenz Service.
Great Service
Rich - Waukesha, WI 53189
First time customer
Jane - Oconomowoc, WI 53066
I had my gas fireplace inspected and my furnace checked for the winter season. Jim and Bill were polite, skilled and did an excellent job. Bill caught a wiring issue on my humidifier that was not done correctly by the installer and never caught by the other company I had been using for my maintenance. I feel confident in getting a maintenance contract.
VERY KNOWLEDGEABLE, HIGH QUALITY SERVICEJim
Dan - Waukesha, WI 53188
Jim answers the phone, gets back to you when promised.
Great service
Jesse - Delafield, WI 53018
Great company!
Friendly, professional service
Richard - Delafield, WI 53018
Jim and his team replaced the a/c units in a timely and convenient manner. They are always friendly and explain in an easy to understand way. Very happy to recommend Grenz Service
Great Service
Paul - Delafield, WI 53018
Grenz Services identified issues with our furnace while conducting seasonal service checks and cleaning. They also identified a leak in our air conditioning system during the same visit. The technician helped setup a system review for the Spring of 2021. Grenz Services conducted an in home review of our heating and cooling needs and offered two options for us to choose from. Each option was explained in detail helping us to make an informed decision for our needs. They setup the installation and removal of the old system. The crew left our house cleaner than when they began the work. They were in and out in about 5.5 hours. I will recommend them to anyone that I know is looking for HVAC work.
FANTASTIC SERVICE
Bill - Oconomowoc, WI 53066
Furnace issue resolved quickly at a great price
Colleen - Oconomowoc, WI 53066
I really appreciated the technicians honesty and accurate diagnostic skills. The work was done quickly and I now have heat again.
Great service
Tom - Brookfield, WI 53045
Jim was able Fix are30-year-old gas fireplace and saved us a lot of money.Other companies quote a lot more money. Jim’s knowledge and personality is simply amazing
Great Timely Service.
Adam - Waukesha, WI 53186
Furnace went out overnight. Jim gas it fixed by noon.
Great service
Monica - Ixonia, WI 53036
Prompt- professional- very courteous- explained what was wrong- and what he was going to do to fix the problem.
Great service
Monica - Ixonia, WI 53036
Prompt- professional- very courteous - explained what was wrongs done what he was doing to fix the problem.
Outstanding service
Becky - Jefferson, WI 53549
Review
Pete - Brookfield, WI 53045
James P. G.
American Standard Install
James P. G.
American Standard install
James P. G.
America Standard AC Install
James P. G.
Thermostat install
James P. G.
American Standard AC install
James P. G.
System install
James P. G.
AC install
James P. G.
Ac maint
James P. G.
Maintenance
James P. G.
Thermostat reprogram
James P. G.
American Standard AC install
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AC maintenance
James P. G.
American standard install
James L. G.
Service Fireplace
James P. G.
Walk in cooler repair
James P. G.
Hoshizaki ice machine install
James P. G.
True cooler repair
James P. G.
Humidifier install
James P. G.
American Standard Install
James P. G.
Hoshizaki ice machine
James P. G.
Install
James P. G.
American Standard Platinum install
James P. G.
American Standard system install
James P. G.
American Standard AC install
James P. G.
Install unit heater
