Heat-of-compression (HOC) dryers feature dual-tower, desiccant design technology with the most energy-efficient design available for oil-free applications. HOC dryers recover heat that is a natural by-product of the compression process to offset virtually all electricity costs other than operating the controller — the cost of powering a light bulb! The HC Series delivers -40°F (-40°C) pressure dew point air consistently under all load conditions at operating costs well below those of typical desiccant dryer designs.Heat-of-compression (HOC) dryers feature dual-tower, desiccant design technology with the most energy-efficient design available for oil-free applications. HOC dryers recover heat that is a natural by-product of the compression process to offset virtually all electricity costs other than operating the controller — the cost of powering a light bulb! The HC Series delivers -40°F (-40°C) pressure dew point air consistently under all load conditions at operating costs well below those of typical desiccant dryer designs.Heat-of-compression (HOC) dryers feature dual-tower, desiccant design technology with the most energy-efficient design available for oil-free applications. HOC dryers recover heat that is a natural by-product of the compression process to offset virtually all electricity costs other than operating the controller — the cost of powering a light bulb! The HC Series delivers -40°F (-40°C) pressure dew point air consistently under all load conditions at operating costs well below those of typical desiccant dryer designs.