Honeywell C7089H1007
Outdoor Sensor Temperature for H1008A Humidistat

The C7089H Outdoor Temperature Sensor provides outdoor temperature information for the H1008A Automatic Humidity Control.

Required for H1008A installations with heat pump or multi-stage furnace. The H1008A Automatic Humidity Control uses the C7089H Outdoor Temperature Sensor to provide true automatic temperature compensating humidity control.

The sensor body is 1¼" long with a ¼" diameter, wire length is 6 inches. Connect to H1008A using standard 18-22 gauge thermostat wire (not included).

Manual Versus Automatic Humidistat

The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.

An automatic humidistat (Aprilaire 60) adjusts the humidity by using an outside temperature sensor.

The Aprilaire manual humidistat as used in earlier Aprilaire humidifiers (Model 4655) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.

When The Outdoor
Temperature is
This Relative Humidity
Should Be Maintained
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