Grenz Service Company LLC

Grenz Service Company LLC maintains a perfect 5.0-star rating across 324 verified client reviews in Delafield, Wisconsin. This independently owned heating and cooling contractor serves residential and light commercial customers throughout Waukesha County and Jefferson County, providing furnace installation, air conditioning replacement, heat pump service, and indoor air quality solutions from its headquarters at 250 West Main St. Homeowners throughout the Lake Country area consistently praised the team for arriving on time, explaining technical options in plain language, and standing behind their installation workmanship.

What distinguishes Grenz Service from neighboring HVAC companies is their willingness to tackle specialized projects beyond standard residential heating and cooling. The company handles gas fireplace installation, repair, and maintenance, a trade many area contractors avoid. Their commercial division services refrigeration equipment and ice machines for restaurants and convenience stores. The website references financing options through trusted lenders, allowing customers to spread equipment costs over time. Service pages explicitly reference emergency repair availability, and the company maintains a service department open Monday through Friday with standard business hours.

Client reviews reveal a pattern of honest assessments and rapid response. When Laurie Wilson's furnaces failed catastrophically on Christmas Eve, owner Jim Grenz arrived at her home on Christmas Day and installed replacement units the day after the holiday. A reviewer named Chris Cordes received a second opinion that saved him between $1,500 and $19,000 compared to repairs other companies had proposed, with the technician recommending no work was needed on his functioning furnace. Todd Anderson selected Grenz after detailed comparisons of Trane models, with the technician explaining that installation precision matters as much as equipment selection.