ACT’s Wrap-Around Heat Pipe Heat Exchanger (WAHX) systems are used to change the performance of the active cooling coil (chilled water or DX). In air conditioning and dehumidification applications, especially where the amount of outside air humidity is relatively high (40% or more) for ventilation and indoor air quality purposes, the cooling coil must lower the temperature of the air and also condense excess moisture. Reducing the temperature of the air is called sensible cooling and condensing moisture is called latent cooling. Essentially, the WAHX is changing the sensible heat ratio of the cooling coil to enhance latent heat or moisture removal.