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?


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 FinancingAbout 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










Our Blog
HELPFUL TIPS FROM OUR TEAM OF EXPERTS
Top 5 HVAC Maintenance Tips Every Homeowner Should Know
Ensure your HVAC system runs smoothly with these top 5 maintenance tips! From changing filters to scheduling regular inspections, keep your home comfortable all year
The Importance of Regular Maintenance for Your HVAC System
Regular maintenance for your HVAC system is crucial for optimal performance and energy efficiency. Discover the benefits of routine check-ups in our insightful blog
Furnace vs. Heat Pump: Making the Right Choice for Your Home
Furnace or heat pump? Explore efficiency, costs, and climate considerations to make the right choice for your home comfort needs.