I went ahead and download the updated version of the MQTT HFAC component with the low/high temperature control. Works great. I went ahead and updated it to include the following command templates:
mode_command_template
temperature_command_template
temperature_low_command_template
temperature_high_command_template
fan_mode_command_template
swing_mode_command_template
hold_command_template
Here is a link to my updated version: mqtt.py
You had some of these templates covered in your version. I added those and others to the version posted. I’d be interested incorporating your additional updates too. Please share.
I’m new to HA development, so I don’t know the best way to get these incorporated into a released version.