Redesign by Tanner Preserve Design. Not the official site. Real site: tsihvac.com
Employee owned · Madison & Green Bay · Since 1947
HVACR equipment, supplies, design and training for contractors across Wisconsin, northern Illinois, eastern Iowa and the U.P. of Michigan.
Counter open 7:30am to 4:30pm, Monday to Friday. After hours, call 608-271-7500.
Two pick-up locations
Mon to Fri, 7:30am to 4:30pm
Mon to Fri, 7:30am to 4:30pm
Mon to Fri, 7:30am to 4:30pm
Stock depth, in their numbers
About page, TSI
Alton/Applied Air · Bryant · Carrier · Greenheck · ICP · Payne · Skypak · Sterling · Tempstar · Unico
Bell & Gossett · Bradford White · Burnham · Caleffi · Grundfos · IBC · LAARS · Rehau · Spirovent · Taco · Tekmar · Watts · Zilmet
Axi-Therm · Caulk-Silicon · Fernox · No Burst Antifreeze · Nu-Calgon · Rectorseal
Centrotherm · Dektite · Field Draft Controls · Hy-C · Oatey Flashings · Selkirk B-Vent & Solid Fuel
Aprilaire Residential Zoning · Arzel Zoning · Belimo · Carrier i-Vu Open BACnet DDC · Ecobee · Honeywell & Zoning · Pro1 IAQ · Venstar
T-Stat Wire · AC Control Wire Whips · Bussman Fuses · Disconnect Boxes · Electro Industries · Solaira · Tape
Aprilaire, EZ Kleen Filters · Carrier / Bryant · Glasfloss Air Filters · Honeywell Air Cleaners, Humidifiers & Dehumidifiers · Premier-1 · Purolator · RGF · Skuttle
CertainTeed Duct Liner & Wrap · Ductboard · Flex Duct · Hardcast Adhesives · Pipe Insulation
ACR Type M & Soft Copper Tubing · Apollo Carbon Press Fittings · Copper Press Fittings · Wardflex Flexible Gas Pipe · Zoomlock Ref Press
Carlyle Compressors · Climate Control (Heatcraft) · J/B Gauges & Vacuum Pumps · Parker Hannifin/Flo-Con · Ritchie & Appion Recovery · Sporlan Valves · Tecumseh
Carrier Linear Diffusers · Hart & Cooley · Shoemaker
Appion · Bacharach · D-Tek Leak Detector · Fieldpiece · Imperial · Inficon Refrigerant Scales · Malco Tools · Milwaukee Tools · Turbo-Torch
Broan Fans · Hy-C · Laundry Vents · Panasonic Fans · Renewaire · Roof and Wall Caps · Tjernlund Ventors
Line card rev. 3/10/2022
Ask the counter for the current revision.
Eight desks behind
one counter
Plan and spec takeoffs, AutoCAD drawings, fan and pump sizing, and bids taken from blueprints.
PageCarrier, Bryant, Tempstar and Payne, stocked for contractors and builders.
PageCarlyle Certified Partner. Compressors, valves, controls and recovery gear for supermarkets, restaurants and plants.
PageBoilers, circulators, air separators, radiant, glycol and tankless, with piping drawings and technical bulletins behind the desk.
PageCarrier i-Vu open BACnet and the Carrier Control Expert program, plus zoning, thermostats and actuators.
PageMechanical and electrical design, code compliance, and building and system analysis reports.
PageBring the model number, the serial number and the start-up date. That is what the status check runs on.
PageClassrooms in both branches, plus six more locations around the territory, running all year.
PageSpring 2026 schedule
Six classes, eight locations
Spring Training is open for registration. Classes run hands-on, on real equipment, for apprentices on their first month and for techs who have been at it twenty years.
| Class | For | What you leave with |
|---|---|---|
| Basic A/C | New apprentices | System basics, wiring and programming setup, charging procedures, troubleshooting. |
| AC & HP Install | New apprentices | How a heat pump differs from an A/C, electric heat strips, low voltage setup on Infinity and Evolution, charging. |
| Basic Airflow | Installers, techs | Duct design and sizing, CFM testing, zoning on Infinity, Evolution and Ion systems. |
| ECM Motors | Service techs | Motor construction, control theory, communication, failure modes, testing and replacement. |
| RTU Install & Set-Up | Experienced techs | IGC boards and fault codes, Humidi-mizer and VFD programming, economizer controls, Comfort Link. |
| Carrier ABB VFD | Commercial techs, maintenance, controls | Hardware replacement, parameter configuration, keypad work, integration and troubleshooting. |
Seven dates from
their own history page
Opens as Wisconsin Furnace Company, selling Armstrong furnaces around Madison.
Buys Kerscher Metal Service in Green Bay, a house that dated back to 1899.
Renamed Temperature Systems, Inc. Kerscher keeps its own name.
Takes on the Carrier franchise.
Adds Bryant. Whirlpool, which they were selling, becomes Tempstar.
Kerscher becomes Temperature Systems too. One company, two locations.
Seventy years in the same business.
ESOP · over 100
employee owners
Every person on the floor owns a piece of the company through an ESOP. That is the whole difference between a counter that reads a part number back to you and one that hands you a box.
Over 100 employee owners across Madison and Green Bay, many of them with decades in the trade, which is where the company's stock of experience actually sits.
Open an account and the counter starts working: order at midnight, pick it up at 7:30, or let the next day's truck bring it to the job.
Concept site by Josh Tanner. Not affiliated with Temperature Systems, Inc. Ticket on this page is a sample built from TSI's published line card, not a live order. The official site is tsihvac.com.