Im having a go at creating a custom integration for my heat recovery ventilation system. I’ve ended up with a bunch of sensors, switches and and services since there is (IMHO) no proper entity to represent an HRV/ERV system.
HRV/ERV systems (called FTX here in Sweden) enable recovering energy from exhaust air and are quite the norm here in northern Europe in newly built houses. Their primary function is to regulate air exchange (while recovering energy from exhaust air) as opposed to HVAC systems that regulate temperature. If the incoming air is too cold, an auxiliary heater turns on to compensate.
An HRV/ERV system typically feature the following
Control
- Temperature preset, sets the temperature of supply air
Typically: ECO,Normal,Comfort - Ventilation preset, sets the level of air exchange
Typically: Away, Normal, Boost - Utility mode, special functionality
Typically: Fireplace mode, Cooking mode, might be others as well depending on manufacturer - Auxiliary heating
Turns auxiliary heater on or off - Cooling
Turns cooling recovery on or off
State/Attributes
- Exhaust air temperature
- Intake air temperature (outside temperature)
- Supply air temperature
- Supply air target temperature
- Auxiliary heater temperature
- Auxiliary Heater power (Watts or percentage)
- Supply fan speed (RPM or percentage)
- Exhaust fan speed (RPM or percentage)
- Supply air humidity
- Exhaust air humidity
- Heat exchanger efficiency
The closest thing in Home assistant seems to be the Climate entity.
I request an entity to represent HRV/ERV systems
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