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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.

Raising the Standard in Heating & Cooling

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.

FINANCING OPTIONS

Flexible Financing for your comfort

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 Credit Approval.

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After review and a few quotes/consultations, I chose Grenz Service to install a new Trane furnace and AC. Jim was extremely helpful in assessing our homes heating and cooling needs, offering options, and assisting in selecting a system that best matched the requirements at a reasonable cost. Jim was very detailed with explaining the differences in models and more importantly his installation plan. My understanding is the installation is just as important as selecting the brand and model! Jim and his team exceeded expectations and I would highly recommend!!
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Annual heating system service was performed. The technician was on schedule and the service was efficiently completed.
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Came the day after I called. Was able to fix air conditioning unit in one visit.
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Super impressed with these guys! Came a few hours after I called, fixed the problem, great communication, ultra competent. So stoked we have such a great resource here!
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Prompt and honest service for my True refrigeration products. Highly recommend.
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It is always a pleasure to deal with this family-run company. They are competent, prompt, friendly, and above all honest. I recommend them highly.
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Grenz has done an incredible job servicing my gas fireplace and furnace for years. They’re friendly, knowledgeable, responsive, reliable, care about customers, and go above and beyond to do the job well the first time.
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Fast service and honest to the bone. Will use again.
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The service was very good, fast and professional, I would recommend Grenz service to anybody in the market for replacement or maintenance
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Needed a furnace repaired while my homeowner relative was out or town. Jim Jr. returned my call asap, met me the same day, diagnosed the problem, and ordered the broken part. 100 percent accurate on diagnosis. Pricing was fair and returned as soon as the part came in to finish the repair. A++. Thanks again

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