3 ms·

It's a fail-safe against leaving in the morning for work, opening the windows, and leaving the heating on full-blast all day long as it tries to heat the outsid

It's a fail-safe against leaving in the morning for work, opening the windows, and leaving the heating on full-blast all day long as it tries to heat the outside. It matters even more now given the energy prices in some countries. Hass just sends on/off commands to a self-contained thermostat in response to window sensor state change events. If it fails, you can still manually go to the thermostat and set it to whatever you want.

dividedbyzero 4y ago
Are there any thermostats at all that work completely locally, i.e. without any internet access and no cloud, but still can be controlled via HASS?
- maxerickson 4y ago
  Venstar wifi thermostats have a local API that can be switched on. https://www.home-assistant.io/integrations/venstar/ https://www.home-assistant.io/integrations/venstar/ I've not used it (I installed one because I wanted scheduling and liked that it had further possibilities and wasn't overly expensive).
- kcb 4y ago
  Yea, your best bet for non cloud/internet stuff is to stick with Zigbee or Zwave. I have a Trane Zwave thermostat https://www.zwaveproducts.com/collections/trane/products/xr524-trane-xr524-thermostat-tzemt524aa21ma https://www.zwaveproducts.com/collections/trane/products/xr5... that’s worked well for several years. For a more advanced use case I’ve recently set it up so that the thermostat logic is within HASS. An automation driven by a binary switch helper then switches the thermostat to a fixed hot or cold value for heat and AC. Then I can feed the HASS thermostat with whatever temperature sensor data I want, like an average of multiple sensors around the house. All this is totally optional though if you just want to control the thermostat from within HASS.
adql 4y ago
Flip side - one sensor failure and your home is without heating, and if you so happen to be on winter vacation at the time it can possibly be catastrophical

dividedbyzero 4y ago

Are there any thermostats at all that work completely locally, i.e. without any internet access and no cloud, but still can be controlled via HASS?

maxerickson 4y ago
Venstar wifi thermostats have a local API that can be switched on. https://www.home-assistant.io/integrations/venstar/ https://www.home-assistant.io/integrations/venstar/ I've not used it (I installed one because I wanted scheduling and liked that it had further possibilities and wasn't overly expensive).
kcb 4y ago
Yea, your best bet for non cloud/internet stuff is to stick with Zigbee or Zwave. I have a Trane Zwave thermostat https://www.zwaveproducts.com/collections/trane/products/xr524-trane-xr524-thermostat-tzemt524aa21ma https://www.zwaveproducts.com/collections/trane/products/xr5... that’s worked well for several years. For a more advanced use case I’ve recently set it up so that the thermostat logic is within HASS. An automation driven by a binary switch helper then switches the thermostat to a fixed hot or cold value for heat and AC. Then I can feed the HASS thermostat with whatever temperature sensor data I want, like an average of multiple sensors around the house. All this is totally optional though if you just want to control the thermostat from within HASS.

adql 4y ago

Flip side - one sensor failure and your home is without heating, and if you so happen to be on winter vacation at the time it can possibly be catastrophical