YOUR HEATING, REFRIGERATION, GAS FIREPLACE & AC EXPERTS

Top-Rated Heating & Air Conditioning in Delafield, WI

Heating

Our Heating products are designed to provide efficient and reliable heating and cooling solutions for your home or business.

Cooling

From ductless mini-splits to central AC units, our air conditioning products provide reliable cooling and improved indoor comfort

Fireplaces

Enhance comfort with gas fireplace services! Our fireplace solutions deliver efficient, reliable warmth for your home or business.

Refrigeration

Elevate your restaurant or commercial refrigeration needs! Solutions that provide temperature control for any commercial requirements.

Offers

Elevate comfort with HVAC promotions! Our heating solutions ensure efficient, reliable climate control for your home or business.

About Us

Providing Comfort every hour, in every season

At Grenz Service Company LLC, we take pride in being certified Trane dealers—undergoing rigorous training to stay at the forefront of HVAC technology and service. Our technicians bring deep expertise and attention to detail to every job, treating your home and equipment with the utmost care. Since 1987, homeowners have trusted us for our reliability, professionalism, and commitment to excellence—and we work hard every day to continue earning that trust.

Why Choose Us?

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Experienced Technicians: Our team brings decades of hands-on experience and in-depth HVAC knowledge to every service call.
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Comprehensive Services: From seasonal maintenance to urgent repairs, [company-name] is equipped to handle all your heating and cooling needs.
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Timely and Reliable: We show up on time and get the job done right—ensuring your comfort is never left waiting.
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Customer-Focused Approach: Your satisfaction comes first. We go above and beyond to deliver service that earns your trust.

FINANCING OPTIONS

FLEXIBLE LENDING OPTIONS FOR YOUR NEW SYSTEM

At Grenz Service Company LLC, we believe everyone deserves a comfortable home. That’s why we’ve teamed up with Wells Fargo to provide flexible financing options for your HVAC needs. With convenient payment plans and trusted support, you can invest in reliable heating and cooling solutions that fit your budget. Discover how easy it is to bring home comfort within reach. Financing Subject to Approval.

Apply For Financing

About Us

At Grenz Service Company LLC, we’re committed to raising the bar for heating and cooling services. From superior workmanship to unmatched customer care, we strive to exceed expectations and deliver comfort you can count on—season after season.

Testimonials

SEE WHAT YOUR NEIGHBORS ARE SAYING ABOUT Grenz Service Company LLC

Google Rating
5.0
Based on 222 reviews
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Jason K.
Jason K.
12:58 23 Jun 25
Grenz provides great service at a great price.
Matt H.
Matt H.
18:25 22 Jun 25
Jim Grenz recently serviced our gas fireplace and... I cannot say enough good things about the experience. He did a great job explaining what he was doing and the work he completed. I didn’t realize how much better the fireplace would look and function after the tuneup. His attention to detail and overall pride in his work was very evident and refreshing. Please continue to support great small businesses such as Grenz. Thank you Jim.read more
Scott
Scott
13:32 22 Jun 25
Hit all the marks. Sterling, Would highly... recommend!read more
Kirk F.
Kirk F.
22:59 21 Jun 25
Very professional, knowledgeable, fast, and ... friendly. Highly recommended!read more
Pat H.
Pat H.
01:51 19 Jun 25
Grenz was responsive from my initial inquiry - ... they texted and called back immediately (it was after hours), they scheduled a 2-hour time window for the next day, showed up on time, and efficiently diagnosed and fixed our ac. They also did a nice job explaining the issues and what they suggested for repairs. Great job - I highly recommend them.read more
Renee B.
Renee B.
23:46 18 Jun 25
Everything was great! He was on time, worked... quickly and was very professional! Would definitely recommend!read more
Jessica L.
Jessica L.
20:14 15 Jun 25
Always prompt & kind. Service and quality of work... are excellent.read more
Richard D.
Richard D.
14:54 13 Jun 25
We had five contractors provide quotes for a... complete furnace / AC / thermostat replacement. Pricewise, Grenz was squarely in the middle, even though they quoted a premium product. Jim walked us through the entire removal and instation process, including how and where they would relocate equipment, how to program the thermostat, and maintenance requirements. He made us extremely comfortable with both the equipment and their process. They arrived on time and cleaned-up thoroughly. Highly recommended.read more
Bonnie Blair C.
Bonnie Blair C.
00:17 12 Jun 25
Grenz has been reliable for years and why we... still use them!!read more
Bradley L.
Bradley L.
17:59 08 Jun 25
Grenz technicians did an excellent job of quickly... diagnosing the problem, installing the replacement capacitor and getting the AC back online in a jiffy. Have used Grenz for years and will continue to do so. I recommend Grenz to everyone I know.read more
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Special Offer

Free UV Light with the purchase of a new AC, furnace, or complete system

Free Diagnostic

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