Humidistat Operating Instructions


The humidistat is a device used to measure and control the relative humidity of an enclosed area, such as a room or a house. It is usually connected to humidifying or dehumidifying equipment and controls their operation. It contains both a sensing and a relaying element. The sensing element measures the humidity of its surroundings using changes in electrical resistance between two sets of conductors; and the relaying element relays the information about the change in electrical resistance to the user.

Locating the Thermostat

  • If your humidistat is separate from your humidifier or dehumidifier, you will most likely find it on a main floor near your thermostat. If you can't find your humidistat on a main floor, there is also a possibility that it is actually on the ductwork of your home's heating system.

    Your humidistat will also often have the manufacturer's details and general operating instructions on it. Therefore, looking for the manufacturer's sticker will not only help you locate your humidistat, but is also a good way to identify what exactly your humidistat is if you are uncertain.

General Humidistat Instructions

  • The humidistat can be used to maintain the relative humidity in your home at a certain percentage, preventing both condensation and frost on the inside of your windows and walls. A humidity percentage that is too low can cause your floors to crack and a humidity percentage that't too high can cause mildew to form on the inside of your house. If you see condensation on the inside of your house, the humidity is too high and you should lower the settings on your humidistat. On the other hand, if you feel that the air is too dry and your skin is cracking, you should increase the settings on your humidistat and boost the relative humidity.

    If the humidity of your house isn't changing, it is most likely that the problem is with your humidifier, rather than with your humidistat. You should check whether the furnace blower is operating and also whether the furnace is calling for heat. If none of these is the case and your humidifier still isn't working, you should call in a heating contractor. On the other hand, if your humidifier isn't responding to the instructions from your humidistat, it is possible that your humidistat is broken and you should immediately call in a heating contractor before any damage can be done to your home.

Troubleshooting the Humidistat

  • Signs that your humidistat is set incorrectly are a lot of condensation on walls, windows and doors and wooden floors that are cracking. Although it is normal to sometimes have condensation forming on your windows, if you're getting puddles on your windowsill it is a definite sign that your humidistat is set too high. However, if your wooden floors are cracking, you should be turning up your humidistat to reduce further damage because it's clear that the air is too dry for the wood.

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