A dehumidifying ventilator includes a dehumidistat switch and a user-selection switch coupled to the dehumidistat switch. The dehumidistat switch is operable to enable and disable dehumidification of the dehumidifying ventilator. The user-selection switch includes a plurality of user-selectable positions. Each position corresponds to a particular climate zone of a plurality of climate zones. Each climate zone corresponds to a particular relative humidity. The user-selection switch is operable to cause the dehumidistat switch to enable the dehumidification system when a relative humidity of the input airflow is greater than or equal to the particular relativity humidity of a selected position of the user-selection switch. The user-selection switch is further operable to cause the dehumidistat switch to disable the dehumidification system when the relative humidity of the input airflow is less than the particular relativity humidity of the selected position of the user-selection switch.