Compact. Flexible. Efficient. For almost thirty years, Multistack has led the industry with modular designs for the replacement market, critical cooling redundancy needs, and custom applications for sound and efficiency. Multistack’s standard air cooled modular product line ranges from 10 to 840 tons. Multistack also offers air cooled split units with remote condensers and air to water heat pumps in the modular platform. Package your air cooled chiller with free cooling, pumps, glycol feeders, and many other hydronic accessories for ease of installation.