Grenz Service Company LLC
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About Grenz Service Company LLC
Grenz Service Company LLC holds a 5.0-star rating across 331 client reviews in Delafield, Wisconsin. This HVAC contractor operates Monday through Friday from 8 AM to 5 PM, serving Waukesha County, Jefferson County, and surrounding communities. The company handles residential heating and cooling systems, including furnaces, air conditioners, heat pumps, and ductless mini-splits.
What distinguishes Grenz Service is their commitment to honest diagnostics and customer education. Reviewers consistently note they received second opinions that saved thousands in unnecessary repairs. The company provides financing options through trusted lenders, helping homeowners manage equipment investments. Their service menu extends to gas fireplace maintenance, commercial refrigeration, and indoor air quality solutions, addressing needs beyond standard heating and cooling.
Customer reviews highlight technician Jim's responsiveness during emergencies, including a same-day Christmas Day service call that restored heat after a catastrophic furnace failure. Another reviewer described how Grenz provided a second opinion that contradicted other contractors recommendations, advising no action was needed on a functioning furnace. A third reviewer praised the team's punctual arrival and efficient installation of a complete heating and cooling system.
What Customers Say
Every reviewer awarded 5 stars, with multiple clients noting honest assessments that prevented unnecessary expenses. Three reviews specifically mention same-day or emergency response, while two highlight the technician's willingness to educate homeowners on system maintenance.
Working Hours
| SundayToday | Closed |
| Monday | 8 AM–5 PM |
| Tuesday | 8 AM–5 PM |
| Wednesday | 8 AM–5 PM |
| Thursday | 8 AM–5 PM |
| Friday | 8 AM–5 PM |
| Saturday | Closed |
Services
Heating Repair & Maintenance
Diagnoses and fixes heating system issues, performs tune-ups to maintain efficiency and extend equipment life.
Furnace Installation
Installs new furnaces including replacement, new installation, and tune-up services for optimal performance.
Air Conditioning Services
AC installation, maintenance, repair, and replacement for central cooling systems.
Heat Pump Services
Heat pump installation, repair, and maintenance for efficient heating and cooling year-round.
Ductless Mini-Split Systems
Installation, repair, and maintenance of ductless mini-splits for zoned heating and cooling.
Gas Fireplace Services
Installation, repair, and maintenance of gas fireplaces including leak detection and safety checks.
Commercial Refrigeration
Installation, repair, and maintenance of commercial refrigeration equipment and ice machines.