Applying a protection treatment to TDK relative humidity (RH) sensors has been shown to extend the life expectancy and maintain accuracy in pig barn conditions. This study objected to implement the modified TDK RH sensor and the new optimized temperature and humidity control (THC) strategy developed at PSCI. The controller was evaluated in six identical grower/finisher pig rooms. Three rooms were provided with THC controllers using a 70% RH setpoint while the other rooms had conventional temperature-only controllers. The THC controller provided very good control of room temperature and RH. In conventionally controlled rooms over the first three weeks, the time period when RH was higher than 70% occurred 36% to 85% of the day. In THC rooms, the RH was controlled around the setpoint for 33% to 63% of the day. Pig performance was similar with both control strategies.