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Manufacturers/Multistack
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Multistack

Eau Claire, Wisconsin

Founded 1994

Multistack: Modular Heat Pump Innovation

Multistack, founded in 1994 and headquartered in Eau Claire, Wisconsin, pioneered the modular approach to commercial chillers and heat pumps. Rather than using a single large unit, Multistack systems combine multiple smaller modules that work together, providing the same total capacity with significant advantages in redundancy, efficiency, and serviceability. This modular philosophy is particularly well-suited for geothermal applications in commercial buildings.

Multistack modular heat pump and chiller system with stackable modules
Multistack’s modular heat pump technology — scalable, redundant systems where individual modules can be added or serviced without shutting down the entire plant.

Modular Heat Pump Systems

  • MS Modular Water Source Heat Pumps — Modular heat pump systems ideal for integration with geothermal ground loop fields, available from small commercial to campus-scale capacities
  • MagLev Magnetic Bearing Systems — Frictionless compressor technology for ultra-quiet, ultra-efficient, oil-free operation
  • Air-Cooled Modular Systems — For applications where water source isn't available
  • Heat Recovery Systems — Simultaneous heating and cooling with heat recovery between building zones
Multistack modular system installed in a commercial building mechanical room
Multistack commercial installation — modular design provides N+1 redundancy, ensuring continuous operation even during maintenance or equipment failure.

Advantages for Geothermal Applications

Multistack's modular approach offers unique advantages for geothermal commercial installations:

  • Staged Loading — Individual modules can start and stop based on demand, matching building loads more precisely than a single large unit
  • Redundancy — If one module needs service, the remaining modules continue operating — no total system shutdown
  • Scalability — Add modules as building needs grow, matching future capacity without oversizing initial installations
  • Reduced Footprint — Modular systems often fit through standard doorways, simplifying installation in existing buildings

Why Choose Multistack?

For commercial and institutional geothermal projects, Multistack's modular approach provides advantages that conventional single-unit systems cannot match. The combination of redundancy, scalability, and precise load matching makes Multistack an excellent choice for schools, hospitals, office buildings, and other commercial facilities investing in geothermal heating and cooling. Their Eau Claire, Wisconsin manufacturing ensures American-made quality and responsive support.

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