MiniHold

A .NET MAUI / Blazor app for Windows and Android, for use with ecobee thermostats.

I don't plan on distributing binaries of this app, but you can compile it yourself with Visual Studio 2022 and its mobile app development workload. You will need to create the module Keys.fs in the MiniHold.Abstractions project (it should be the first file in the project) and enter the API key you've generated as an ecobee developer:

namespace MiniHold.Abstractions

module Keys =
    let ApiKey = "key_goes_here"

The main app project is MiniHold.App, which is set up to run on both Windows 10+ and Android. The easiest way to build and install the app is to debug it from Visual Studio - for Android, this means enabling USB debugging on your device and using Visual Studio to debug the app remotely on it.

Also available is MiniHold.Tray, a VB.NET WinForms application that can be minimized to the system tray, shows the current indoor and outdoor temperature in a tooltip, and lets you set certain short-term holds.

Display

• Thermostat name
• Mode and equipment status: The current mode of the thermostat (auto, heat, cool, aux, or off) and any running equipment (e.g. "Cool 1 (A/C)", "Heat 1 (Aux)", "Fan").
• Current temperature: The indoor temperature (rounded to the nearest degree Farenheit) and humidity percentage.
• Last updated: The last time MiniHold got new information from the ecobee servers.
• Weather: The current outdoor temperature, humidity, etc., according to the weather service used by ecobee.
• Forecast: The high and low temperature for the current calendar day.
• Runtime: The current set points of the thermostat for both heating and cooling (only the Auto mode will use both set points, but the thermostat itself always tracks them), the set humidity range, and whether or not the fan is set to always run.
• Hold: The currently active hold (or vacation, etc.), and its start and end date/time.
• Sensors: A list of temperature and occupancy readings for the thermostat and each SmartSensor, as well as the overall temperature reading as averaged by the thermostat based on its algorithms.
• Comfort Settings: A list of each comfort setting and its corresponding temperature range, along with the temperature at which the thermostat will engage heating and cooling (after taking the configured delta into account). Also includes a Runtime row for the current thermostat setting.

Functions

• 15m Hold and 30m Hold: Set a hold for 15 or 30 minutes, respectively.
  • Heat: Adjusts the set point for heating 1.5°F past the point which causes the thermostat to activate heating, given the current indoor temperature. The cool point will be set 10°F above the heat point.
  • Cool: Adjusts the set point for cooling 1.5°F past the point which causes the thermostat to activate cooling, given the current indoor temperature. The heat point will be set 10°F below the heat point.
  • Fan: Sets a hold that forces the fan on while using the same set points as the current runtime.
• Away: Set a hold to apply the Away comfort setting for a certain amount of time.
  • For 1 hour: Sets away for 60 minutes. (This is a quick way to essentially pause your heating/cooling equipment to reduce noise, without the risk of forgetting to turn it back on.)
  • For 1 day: Sets away for 24 hours.
  • For 1 week: Sets away for 7 days. (Remember that you can cancel the active hold before it expires.)
  • until 7 am, until 4 pm, until 9 pm: Sets away until the next time the clock reads a certain time, which could be on the current calendar day or on the next one. (This may be more useful with auxiliary heat, which is generally consistent, than with heat pumps, where output varies depending on the temperature delta between indoors and outdoors.)
• Cancel Hold: Only shows up if a hold is active. Removes it from the event stack and returns to the program / vacation / etc.

Vacations can be scheduled and deleted from the Vacations page. The app also includes a Forecast page that shows daily forecasts from the weather service used by the thermostat and an Abstraction page that shows the underlying ThermostatInformation F# record that the app puts together.