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 234 reviews
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Kirk W.
Kirk W.
14:42 16 Jul 25
Grenz Svc Co, LLC was courteous and professional... from start to finish: Beginning with a thorough evaluation of the specific, unique needs of our home’s AC/ heating, to a completed installation by a team that moved like clockwork. Glad we chose Grenz and know we’re in good hands for the life of the unit. Thanks!read more
Christine E.
Christine E.
00:40 13 Jul 25
My AC went out on a Thursday night. I called ... early Friday afternoon and they were out here before the end of the day! Awesome service, fantastic tech, highly recommend!read more
John W.
John W.
14:40 12 Jul 25
Always professional. On time and done right. My... go to guys for furnace and air conditioner.read more
Dave B.
Dave B.
17:53 09 Jul 25
He did a great job of helping us select a unit... and then installing it. My wife was thrilled!read more
Hollis C.
Hollis C.
14:39 03 Jul 25
Amazing service! Always professional and reliable!
Robbie G.
Robbie G.
20:24 27 Jun 25
Jim was great. Knowledgeable and helpful. I... finally have a person I can trust. So glad to have him.read more
John F.
John F.
21:29 26 Jun 25
Call for service late Sunday night, got called... back Monday AM, Tech showed up early afternoonAll during hottest and humid week in June. Fast and Freindly, always honest prices. My go to HVAC people.read more
Colt P.
Colt P.
22:43 25 Jun 25
Grenz Service does great work with excellent... communication. The job is done right and they make sure you are satisfied.read more
M K
M K
21:39 24 Jun 25
Always great service! Friendly, efficient and... excellent quality.read more
Matthew V.
Matthew V.
13:39 24 Jun 25
Service was fast and friendly. Explained... throughly what the issues were and gave me all possible options and cost of each. Great experience.read more
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Our Blog

HELPFUL TIPS FROM OUR TEAM OF EXPERTS

Special Offer

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

Free Diagnostic

Read financing terms.
Get a Free diagnostic on your HVAC system! No service fees—just expert insights and honest recommendations. Limited-time offer—book your appointment today!
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