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A humidifier includes a housing, a fan assembly, a wick assembly, a first humidity sensor, a second humidity sensor, and a controller. The housing has an air inlet, an air outlet, and a reservoir for holding water. The fan assembly creates an airflow through the housing from the inlet to the outlet.

A humidifier includes a housing, a fan assembly, a wick assembly, a first humidity sensor, a second humidity sensor, and a controller. The housing has an air inlet, an air outlet, and a reservoir for holding water. The fan assembly creates an airflow through the housing from the inlet to the outlet. The wick assembly is in fluid communication with the water in the reservoir and extends into the airflow within the housing for adding moisture to the airflow. The first humidity sensor measures an ambient air relative humidity and produces a first signal corresponding to the ambient air relative humidity. The second humidity sensor measures an outlet air humidity and produces a second signal corresponding to the outlet air humidity. The controller is in electrical communication with the first and second humidity sensors. The controller receives the first and second signals and performs calculations to produce an output signal.

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1. An evaporative humidifier comprising:a housing having an air inlet, an air outlet, and a reservoir for holding water;a fan assembly for creating an airflow through the housing from the inlet to the outlet;a wick assembly in fluid communication with the water in the reservoir and extending into th

1. An evaporative humidifier comprising:a housing having an air inlet, an air outlet, and a reservoir for holding water;a fan assembly for creating an airflow through the housing from the inlet to the outlet;a wick assembly in fluid communication with the water in the reservoir and extending into the airflow within the housing for adding moisture to the airflow;a first humidity sensor for measuring an ambient air relative humidity and producing a first signal corresponding to the ambient air relative humidity;a second humidity sensor for measuring an outlet air humidity and producing a second signal corresponding to the outlet air humidity; anda controller in electrical communication with the first and second humidity sensors, the controller receiving the first and second signals and performing calculations to produce an output signal. 2. The evaporative humidifier of claim 1 wherein the first humidity sensor is located proximate the air inlet. 3. An evaporative humidifier comprising:a housing having an air inlet, an air outlet, and a reservoir for holding water;a fan assembly for creating an airflow through the housing from the inlet to the outlet;a wick assembly in fluid communication with the water in the reservoir and extending into the airflow within the housing for adding moisture to the airflow;a first humidity sensor for measuring an ambient air relative humidity and producing a first signal corresponding to the ambient air relative humidity;a second humidity sensor for measuring an outlet air humidity and producing a second signal corresponding to the outlet air humidity; anda controller in electrical communication with the first and second humidity sensors, the controller receiving the first and second signals and performing calculations to produce an output signal, wherein the controller calculates and outputs a signal indicative of an instantaneous output efficiency of the humidifier, the output signal being sent to and received by a display which displays the instantaneous output efficiency. 4. An evaporative humidifier 1 comprising:a housing having an air inlet, an air outlet, and a reservoir for holding water;a fan assembly for creating an airflow through the housing from the inlet to the outlet;a wick assembly in fluid communication with the water in the reservoir and extending into the airflow within the housing for adding moisture to the airflow;a first humidity sensor for measuring an ambient air relative humidity and producing a first signal corresponding to the ambient air relative humidity;a second humidity sensor for measuring an outlet air humidity and producing a second signal corresponding to the outlet air humidity; anda controller in electrical communication with the first and second humidity sensors, the controller receiving the first and second signals and performing calculations to produce an output signal, wherein the controller continuously calculates an output efficiency and records output efficiencies over time to monitor degradation of the wick assembly, whereby if the output efficiency is below a predetermined value after a predetermined amount of usage of the humidifier, the controller determines and outputs an indication that a wick servicing condition exists. 5. The evaporative humidifier of claim 4 wherein the output signal is received by an indication means which notifies a user that the wick servicing condition exists. 6. The evaporative humidifier of claim 5 wherein the indication means is an audio stimulus. 7. The evaporative humidifier of claim 5 wherein the indication means is a visual stimulus. 8. The evaporative humidifier of claim 4 wherein the controller turns off the fan assembly automatically to prevent inefficient usage while the wick servicing condition exists. 9. An evaporative humidifier comprising:a housing having an air inlet, an air outlet, and a reservoir for holding water;a fan assembly for creating an airflow through the housing from the inlet to the outlet;a wic k assembly in fluid communication with the water in the reservoir and extending into the airflow within the housing for adding moisture to the airflow;a first humidity sensor for measuring an ambient air relative humidity and producing a first signal corresponding to the ambient air relative humidity;a second humidity sensor for measuring an outlet air humidity and producing a second signal corresponding to the outlet air humidity; anda controller in electrical communication with the first and second humidity sensors, the controller receiving the first and second signals and performing calculations to produce an output signal, wherein the controller continuously calculates an output efficiency and records output efficiencies over time to monitor degradation of the wick assembly, whereby if the output efficiency is below a predetermined value before a predetermined amount of usage of the humidifier, the controller determines and outputs an indication that a low liquid condition exists. 10. The evaporative humidifier of claim 9 wherein the output signal is received by an indication means which notifies a user that the low liquid condition exists. 11. The evaporative humidifier of claim 10 wherein the indication means is an audio stimulus. 12. The evaporative humidifier of claim 10 wherein the indication means is a visual stimulus. 13. The evaporative humidifier of claim 9 wherein the controller turns off the fan assembly automatically to prevent inefficient usage while the low liquid condition exists. 14. The evaporative humidifier of claim 13 wherein the controller turns off the fan assembly during the low liquid condition only when the outlet air humidity is substantially equal to the ambient air relative humidity, thereby indicating that the wick assembly is generally dry. 15. The evaporative humidifier of claim 1 wherein the output signal is received by an indication means which notifies a user that a low liquid condition exists. 16. The evaporative humidifier of claim 15 wherein the indication means is an audio stimulus. 17. The evaporative humidifier of claim 15 wherein the indication means is a visual stimulus. 18. The evaporative humidifier of claim 1 wherein the controller turns off the fan assembly automatically to prevent inefficient usage while a low liquid condition exists. 19. The evaporative humidifier of claim 18 wherein the controller turns off the fan assembly during the low liquid condition only when the outlet air humidity is substantially equal to the ambient air relative humidity, thereby ensuring that the wick assembly is generally dry.