The ASP20 Airstack™ modular air-to-water heat pump is designed for two-pipe HVAC systems. Available in a 20-ton module size, the heat pump can be used singly or in a multiple configuration for applications requiring several hundred tons. Each system is manufactured with digital controls and building automation interfaces. Typical applications include multiunit residential buildings, institutional facilities, and commercial office spaces where quiet operation is especially desirable. According to the manufacturer, the units are ideal for upgrading facilities with two-pipe configurations for a more economical and efficient source of heating and cooling.

Multistack LLC, 1065 Maple Ave., Sparta, WI 54656; 608-366-2400; 608-366-2450 (fax); or

eProduct 202