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Multistack, LLC Tech Stack

Modular chiller and heat pump manufacturer with magnetic levitation compressor tech

Machinery Manufacturing Sparta, WI 51–200 employees Privately Held

Multistack designs and manufactures chillers, geothermal heat pumps, and heat recovery systems from Sparta, Wisconsin, targeting HVAC OEMs and service networks. The company is actively scaling field service and repair operations (evident from overseas startup projects, standardized repair sequences, and complex service-plan development), while simultaneously tightening internal QMS and safety protocols—suggesting a pivot from pure manufacturing toward service-led revenue and compliance maturity.

Tech Stack 12 technologies

Core StackAutoCAD Revit Inventor AutoCAD Electrical Adobe Acrobat Microsoft Office PowerPoint Microsoft 365 Excel Word Outlook Adobe

What Multistack, LLC Is Building

◆Challenges

Improving serviceability and efficiency
Standardizing repair sequences
Forecasting service trends
Quantity discrepancies
Part shortages
Field failures or production defects
Hazardous refrigerant handling
Compliance with industry standards

▲Active Projects

Startup and maintenance of multistack chiller systems at overseas locations
Standardize sequences of operation for common repair project types
Develop detailed plans for complex field service and repair projects
Hvac qms development
Brazing station risk assessment
Quality and safety training

Hiring Activity

Decelerating15 roles · 3 in 30d

Department

Manufacturing

7

Engineering

4

Ops

3

Sales

1

Training

1

Seniority

Mid

7

Junior

6

Senior

2

Manager

1

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About Multistack, LLC

Multistack manufactures modular and conventional chillers, geothermal heat pumps, air-to-water heat pumps, and Dedicated Heat Recovery Chillers (DHRC) for the HVAC industry. The product line emphasizes high-efficiency, low-impact cooling and heating using reduced refrigerant volumes and fossil-fuel alternatives. The company holds patents on the modular chiller concept, DHRC controls, and MagLev oil-free magnetic levitation compressor technology. Beyond standard chiller products, Multistack serves specialized segments including MRI chillers, water-cooled condensing units, and tactical chillers for defense. Operations are based in Sparta, Wisconsin, with workforce of 51–200 employees.

HeadquartersSparta, WI

Company Size51–200 employees

Hiring MarketsUnited States

Frequently Asked Questions

What software does Multistack use for design and manufacturing?

Primary stack includes Inventor, AutoCAD, AutoCAD Electrical, and Revit for design; Adobe Acrobat, Microsoft Office suite (Excel, Word, PowerPoint, Outlook, 365) for documentation and collaboration.

What is Multistack working on now?

Active projects include overseas chiller startup and maintenance, standardizing repair sequences, developing field service plans for complex projects, HVAC quality management system development, brazing station safety assessment, and quality/safety training programs.