[RELEASE] Attic Fan Smart Ventiation

Introducing the Attic Fan Smart Ventilator

On request from folks here is an app for the Smart Attic Fan Ventilator.

Key Features

It turns the attic fan ventilation on/off based on internal and external conditions including:

  • Sunlight on the roof
  • Outside temperature
  • Inside temperature
  • Target/expected temperature
  • Supports up to 3 operating schedules
  • Operate only in specific modes

If you have any feature requests please send it in.


If you don’t have a external light/temperature sensor install the Smart Weather Tile and Updater here. You can use this as your external light and temperature sensor. [RELEASE] Smart Weather Station Tile Updater and Severe Weather Notifications - Fix Broken Modes and Repeat Notifications

This app is available on the RBoy Apps server (along with all the rest of the premium and free apps)

Visit our Facebook page to get access to all our Premium ST Apps Server and get updates on new apps at http://www.facebook.com/RBoySTApps

If you like the Apps consider supporting our development efforts.

The latest version of these apps with updates are available on the RBoy Apps server.

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“Whole House Fan” sounds similar but it does not use the sunlight to help make decisions.

Added support for up to 3 operating schedules, you can select day(s) of the week (multiple) and a start/stop time for each schedule

Added optional support to turn on fan when HVAC in Attic is running in cooling mode to keep the HVAC cool and more efficient

Fixed a bug in optional feature to turn on fan when the A/C is in cooling mode

Version 2.1.2

  • Only turn off the fan if the fan is currently on (save Z-Wave air space)

##attic Fan Smart Ventilation - Version 2.1.3

  • Added fix for error while installing if the hub location/timezone wasn’t specified. Now it’ll warn the user to add the hub location to that it can pick the correct timezone otherwise it’ll default to UTC timezone.

Thanks to DnCCrew for this step:

To set the hub Location, from smartphone app:

  1. Clicked on the 3 lines (top right corner)
  1. Clicked on gear icon (top right)
  2. Click area that says “Tap to set where home is on the map” and zoom in to correct location on map.

###Attic Fan Smart Ventilation - Version 2.1.4

  • Fix for a scheduling bug in the ST API when end time is before start time (i.e. next day)

###Attic Fan Smart Ventilation - Version 2.2.0

  • Added support to automatically check for SmartApp and Device updates and notify user

After updating the code, open the SmartApp and click Done for the changes to take effect

Attic Fan Smart Ventilation - Version 02.03.00

  • Added support for schedules ending past midnight into next day
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Attic Fan Smart Ventilation - Version 02.04.00

  • Improved UI layout

© RBoy Apps

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I apologize if this is kind of a silly question but what hardware does this control? Does it speak to a specific model of attic fans? Or can you install any of those fans and you just setup a smart switch to turn it on?

Also, regarding the weather station, same question. Is this intended for a specific model?

I’m currently using your apps to control my smartlocks. Thanks for putting these apps together! Top quality stuff!

Hi there. It can work with any fan which is connected to a smart switch. You can connect your attic fan to a paddle switch or any an outlet that can be controlled through SmartThings and the app will use it to control your fan.

The weather station is a built in service from SmartThings which pulls the weather information from the weather underground. It’s not a perfect substitute for a light and temperature sensor but it does a decent job check if there’s sun shining down on your roof and the temperature outside so the app can use that information while managing your attic fan.

Can this handle a comparison like: turn on the attic fan if the attic temperature is more than 10 degrees higher than the outside temperature? or turn on the attic fan if the attic humidity is more than 10% higher than outside humidity?

Hi there. You can set the target temperature in the attic (where the temperature sensor is located). The app will manage the fan automatically based on a variety of criteria like external temperature, lux/radiance of the sun etc to determine when to activate the fan. You can check out the first post for a list of options and the screenshots.

Attic Fan Smart Ventilation - Version 02.05.00

  • Added option to restrict app schedules to operate during specific location/hub modes
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