You can buy a humidity meter at Home Depot for about ten dollars which will measure the relative humidity in your house. But, a fancy thermostat connected to your cooling system will do nothing to control the humidity in your house. You would need to use a dehumidifier which will overcool the air, removing moisture, and then reheat the air to the desired temperature. The relative humidity is the amount of moisture in the air "relative" to the amount of moisture that the air is capable of holding at the temperature of the air. So, if the relative humidity is 50 percent, it means that the air is holding half of the amount of moisture that it is capable of holding without becoming saturated.
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