Understanding Auto (Heat & Cool) ModeUpdated 19 days ago

Overview

Auto Mode allows a Mysa for Central HVAC thermostat to automatically switch between heating and cooling to maintain temperature within a user-defined range. When enabled, users are given two setpoints — Heat To and Cool To — and the thermostat will activate heating or cooling as needed to keep the room temperature between these thresholds.

Availability

• Supported Device: Mysa for Central HVAC

• Requirements: Thermostat must be paired and running firmware 4.4.11 or higher.

• Initial Enablement:

  • Auto Mode must first be activated in the Mysa app before it will appear on the thermostat hardware.

  • On first activation, the user is prompted to enable Auto Mode and configure the deadband (minimum separation between setpoints).

  • This setup only needs to be completed once.

How to Enable Auto Mode

1. Open the Mysa app and tap the device tile.

2. Open the Mode menu and select Auto.

3. If this is the first time using Auto Mode:

   • The app will prompt the user to enable Auto Mode.

   • The app will guide the user through configuring the deadband.

4. Once enabled:

   • Dual setpoints will appear on the device control screen in the app.

   • AUTO mode will now appear in the thermostat’s hardware mode menu.

5. To modify Auto Mode settings at any time, go to:
   Device Settings → Thermostat Preferences.

Deadband Definition:
The deadband is the minimum temperature separation required between the Heat To and Cool To setpoints. It prevents short-cycling by ensuring a minimum gap (default: 4°F / 2°C).

How Auto Mode Works

Dual Setpoint Control (App)

When Auto Mode is active, the thermostat follows two setpoints:

• Heat To: Heating turns on when room temperature drops below this value.

• Cool To: Cooling turns on when room temperature rises above this value.

• Deadband Range:

  • When the room temperature is between the Heat To and Cool To values, neither heating nor cooling runs.

  • The fan may still run depending on fan control settings.

  • Heating/cooling engagement is subject to any built-in equipment delays or protections.

Deadband Enforcement

• The app ensures the two setpoints cannot be closer together than the configured deadband.

Hardware Behavior

• Hardware does not provide dual setpoint adjustments.

• When Auto is selected on the thermostat:

  • The display shows AUTO (not a numeric setpoint).

  • The thermostat follows the dual setpoints last set in the app.

• Switching away from Auto and back again on the hardware restores the previously selected Heat To and Cool To values.

Defaults, Ranges & Limits

Deadband

• Default: 4°F (2°C)

• Adjustable Range (App):

  • 4°F to 10°F in 1°F increments

  • 2°C to 6°C in 0.5°C increments

Setpoint Limits

• Heating (Heat To): 41–86°F (5–30°C)

• Cooling (Cool To): 61–98°F (16–37°C)

App vs. Hardware Behavior

App

• Full dual setpoint control (Heat To / Cool To).

• Ability to configure deadband (Thermostat Preferences).

• Device tile and control screen display Auto Mode when active.

Thermostat Hardware

• Auto Mode appears only after initial enablement in the app.

• Displays an Auto icon + “AUTO” in the mode menu; numerical setpoints are not shown.

• Users must adjust Heat To and Cool To in the app — hardware does not support dual setpoint editing.

• Switching to another mode and back to Auto preserves the previously defined setpoints from the app.

Scheduling & Shortcuts

Auto Mode is fully supported in schedules and shortcuts. Users can create scheduled events or shortcuts that:

• Set the device to Auto Mode, and

• Specify the Heat To and Cool To setpoints for each event.