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
Review
Pete - Brookfield, WI 53045
Fast and efficient service.
Donna - Oconomowoc, WI 53066
Great service/immediate help
JA - Delafield, WI 53018
Amazing service, affordable price!
Jennifer - Oconomowoc, WI 53066
Jim came out to fix our fireplace that had stopped working. He was able to fix it quickly and at an affordable price. Sometimes having services coming into your home can be awkward, but he was very friendly and explained what the problem was and how he fixed it. Highly recommend Grenz Service!
Very professional service
Jim - Waukesha, WI 53188
Thorough
Jim Was Great
Austin - Wauwatosa, WI 53226
Jim was over to do service/a tuneup on our gas fireplace. He was very thorough and explained everything that he was doing. He has a great amount of knowledge and experience which made me really comfortable at the end of the day. I would recommend his company to anyone.
Great service!
Amanda - Delafield, WI 53018
Once again, great service! Thorough, hard working, efficient, friendly, courteous, and knowledgeable. We have loved working with them over the years and will continue to.
Great
Bill - Elm Grove, WI 53122
Grenz is an exemplary service company. I highly recommend Grenz and the American Standard Brand.
excellent, very pleased, would tell my friends
Gary - New Berlin, WI 53151
Trusted and professional
Kristin - Oconomowoc, WI 53066
Great service
Kerry - Hartland, WI 53029
My AC unit stopped working on a Friday morning. Jim was able to come out within a couple of hours that afternoon. He was very knowledgeable and knew right away what the problem was. I appreciated that he explained to me what was wrong. I have Grenz scheduled for general maintenance coming up and know I’ve got a great company coming.
Excellent service
Bob - Wales, WI 53183
Grenz crew arrived exactly on time to install a furnace. They estimated that total installation time would have them leaving the site by 2pm. However, every thing went well and they were finished up by 12:30pm.
Top Notch Company!
Judy - Brookfield, WI 53045
We needed both central air and furnace unit. Jim came out to our home to meet with us and provided a very thorough and comprehensive explanation of his products and services. He inspected our home and gave us several options. I have NEVER met an individual so thoroughly knowledgable about the industry, their product line, and technical details. Outstanding person to work with. Very professional communication - and timely! They reminded us of their upcoming visit and provided detailed receipts. (Nothing hand-drawn here!). The install was flawless - professional and hard-working team. I sincerely wish I experienced this degree of professionalism, honesty, and expertise with each company we worked with. We are very grateful we found Jim and his team. They are now our HVAC company and we would highly recommend them to everyone. Thank you Jim!
Great service
Joeseph - Pewaukee, WI 53072
Called before the appointment and was very knowledgeable on my bar coolers
Outstanding service. Quick response to fix my AC
Mike - Delafield, WI 53018
Jim does a great job of explaining the problem and offering solutions to fix the problem. I can trust Jim.
This is the way companies should do business
Mark - Hartford, WI 53027
Jim and his crew were outstanding in every aspect. On time, professional, polite, and committed to detail and customer satisfaction. After receiving and reviewing quotes, I knew Jim was the man for the job. When he put the quote together, he sent it to my email immediately for review and it was totally detailed. Remember to always, always, always get any oral agreements put in writing. We worked out an agreement on an additional item, and Jim revised the quote within minutes of hanging up with me. His labor agreement was 4 years as opposed to the standard 1 year with other companies. Looking forward to many trouble free years with our new American Standard AC unit. Choose Jim; you will be glad you did.
Great service, quick response
Nadia - Delafield, WI 53018
EXCELLENT SERVICE AND INSTALLATION!!!
David - Delafield, WI 53018
Great service
Joline - Oconomowoc, WI 53066
Jim called me back very shortly after I had left a message. He was able to come out to my house the same day. He had been recommended by my son and I too would recommend him. My air conditioning was not working and Jim was able to fix it the same day because he explained that he carries these parts with him so his clients don’t have to wait. Especially in the recent humid days we are having
Great service
Brookfield Ryan - Brookfield, WI 53005
I appreciated how engaging James was during the service call. He showed me in detail how a pressure switch failed which prevented the furnace from going into stage 2 heating. He also showed me what was causing a humidifier leak and how to replace the humidifier filter. Overall, Grenz seemed pretty honest and fair. I'll probably continue using them for future service.
On Time Great service and personality
Pat - Delafield, WI 53018
Bill was outstanding person and knew exactly what he was doing --very professional
Excellent service as always!
Krishna - Nashotah, WI 53058
Jim Grenz has been servicing our heating & cooling in our homes for 21 years! We’ve always been highly satisfied with his work-he’s prompt, friendly, and knowledgeable. He’s installed new furnaces & air conditioners for us. Everything is top notch!!!
Great service and price......
Tim - Oconomowoc, WI 53066
I called at 8 AM with a down AC unit and the service came out and it fixed in hour. Unbelievable response.....
Great service !! And very awesome price !!
Charlene - Pewaukee, WI 53072
Prompt
James - Delafield, WI 53018
James P. G.
Install unit heater
James P. G.
Install unit heater
James P. G.
AC repair
James P. G.
Unit heater install
James P. G.
American Standard AC install
James P. G.
American Standard air conditioner install
James P. G.
American Standard Vartiable speed AC system
James P. G.
Replace Trane condensing unit
James P. G.
American standard ac repair
James P. G.
American Standard Platinum install
James P. G.
Compressor replacement
James P. G.
American standard system install
James L. G.
Install new gas log system.
James P. G.
Carrier furnace repair
James P. G.
Carrier furnace repair
James P. G.
True cooler repair
James P. G.
Goodman furnace repair
James L. G.
Tune up Fireplace and test operation.
James P. G.
Bryant furnace repair
James P. G.
Carrier furnace repair
James P. G.
Replace door closer on walk in cooler
James P. G.
Humidifier install
James P. G.
Rheem heat repair
James P. G.
Lennox furnace repair
James L. G.
Repair IPI controls on fireplace.
