Finds the optimal ventilation fan rating and heater BTU output requirements for your greenhouse.

Uses standard industry formulas for ventilation and heat loss in calculations.

The dimensions of the greenhouse, cover material types and temperature settings can all be varied to determine how this changes the results. Inputs can be in Feet or Meters, Fahrenheit or Celsius values.

Results can be sent by text or email.

Get ready with the right equipment to insure healthy plants!

What’s New

Version 1.0.1

Ventilation requirements of greenhouses in winter are generally on the order of two to three air changes per hour. Added these air exchange rates to the App.

App Privacy

The developer, H3 Apps, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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