"This study aimed to assess the dehumidification effects of subslab ventilation systems in homes and obtain general field data on dehumidifier operation (hours and energy use) in Wisconsin homes. Results include information on the characterization of the operation and energy use of dehumidifiers, effect of subslab ventilation systems on dehumidifier use, the application of regression analysis to dehumidifier data and analysis of additional house ventilation-induced subslab fan operation."