Unit has been operational for 6 months - just had our first serious heat wave (96 degrees) and unit performed perfectly. Humidity stayed relatively high on medium setting, despite heat and lack of humidity in the climate. Only hiccup was initial shipment that failed to provide bottle probe. Customer service and technical reps were excellent and got probe here immediately - entire experience with staff has been excellent. Product is capable of maintaining proper temperature and humidity in a very difficult climate using through-the-wall installation.