Angled view of thermostat-humidity controller, compatible with Maxx Air electric roof and gable attic fans.
The XXDUOSTAT has 60 -120 degree Fahrenheit and 50 - 90% humidity settings, is an energy saving measure, and installs quickly to your existing power attic fan.
Close-up of humidity and temperature knobs with clearly labeled temperature and humidity percentage settings, which can be adjusted with a flathead screwdriver.
Left side profile view of the controller showing the wiring opening.
Back of duostat unit showing the mounting design to the attic rafter and the switch sensor.
Bottom view of the duostat.
Top view of the duostat
Themostat/Humidistat unit open showing the internal wiring for the controller.
Front view of the duostat showing the temperature and humidity controls.

Dual Thermostat/Humidistat Control for Power Attic Ventilators

Regular price$87.99
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Reduce both moisture and excess heat in your attic with this Duostat to avoid mold and mildew issues, prolong the life of your roofing components, and reduce your energy costs when paired with your attic fan. This control mounts to a rafter using wood screws and has a wiring diagram provided to complete installation. As a general rule for power attic vents, your normal temperature setting will range from 95 - 115° F and humidistat setting from 60 - 70% depending on average regional temperatures and local humidity levels—a setting too low will run the fan continuously, and a setting too high will result in inadequate ventilation.

This control is compatible with Maxx Air, Cool Attic, and Ventamatic roof and gable mount power attic ventilators (excluding solar vents). Not for use with whole house fans.


Mounts to attic rafter with wood screws


Adjustable temperature from 60 - 120° F. Adjustable humidistat setting from 50 - 90%.

Energy Efficiency:

Controls the operation of your power attic ventilator, running the fan only when needed

Other Features:

Controls up to 3 units, not to exceed 10 amps

Primary Color


Unit Weight

1 lb.

Box Dimensions

8.25 in. H x 5.25 in. W x 3 in. D

Alias SKU(s)


Single Product UPC


Other Details

10 Amps, 120 Volts AC

Our products are shipped via Fedex Ground or LTL Carrier depending on the size and weight of the product. Should you have a special requirement for shipping please contact us at or call us to discuss your requirements. You can use the Freight Estimator in the Shopping Cart to determine what the freight cost will be on your item. Freight will be billed at the time of shipment. Due to the nature of the products, we cannot ship via Express or overnight service. Typically orders ship within 5 business days. Upon shipment you will be sent a notification of shipment with the Tracking Number. We reserve the right to recall a shipment for any reason.

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