Temperature Systems Inc. Madison and Green Bay, WI

Temperature Systems Inc. has served Wisconsin's HVAC industry since 1947, making it one of the region's longest-running distributor operations. This employee-owned company operates from two locations, Madison and Green Bay, and holds a 4.0-star rating drawn from 13 customer reviews. As a wholesale distributor, TSI supplies equipment, parts and supplies exclusively to licensed contractors rather than retail homeowners, though the company staff readily assists tradespeople with product selection and technical questions. The company's service area spans southern and northeastern Wisconsin, with dedicated phone lines for each branch.

What distinguishes Temperature Systems is its breadth: over 210 product lines and more than 12,000 SKUs stocked across heating equipment, refrigeration, hydronics and indoor air quality categories. The company operates its own delivery fleet, providing scheduled truck delivery to contractor accounts across the region. Year-round training programs include EPA 608 certification and testing, a valuable credential for technicians maintaining commercial refrigeration systems. As an Energy Star partner, TSI supplies equipment meeting federal efficiency standards and supports contractors pursuing rebate incentives for qualifying installations.

Customer experiences reveal a company that responds to specific needs. Mike Vaessen described how TSI quickly shipped a Carrier AC unit to a veterans home in Green Bay during summer heat. Ryan Hart, a contractor, noted the staff consistently has needed supplies in stock andavigate dock access for efficient loading. The Madison warehouse location has drawn criticism for intensive training expectations, while both locations receive praise for friendly staff and straightforward loading procedures.