> ## Documentation Index
> Fetch the complete documentation index at: https://docs.axle.energy/llms.txt
> Use this file to discover all available pages before exploring further.
# HVAC
Axle integrates with electric heating and cooling systems to deliver thermal comfort at
the minimum cost.
# Control via thermostat
We can either control the power of heating & cooling systems directly, or by using a set-level approach via
a smart thermostat. Indirect control via the thermostat allows you to ensure that the dynamics of control
remain within manufacturer's intended bounds. This can allay concerns around reduced operating efficiency (sCOP),
particularly of heat pumps.
We use Enode to connect to thermostats - see [their list of support hardware](https://developers.enode.com/api/capabilities/hvac).
# Integrating with Axle
You can either integrate into the Axle API, or we'll integrate into an existing cloud API.
### Telemetry
If we are integrating directly with the heating system we'll need:
* Power `kW`
* Temperature `°C`
* Outside temperature `°C` *Optional*
Pushed to our [Asset Readings](../api-reference/data/) endpoint.
If we're optimizing via the thermostat, temperature alone suffices.
### Dispatch
You can register for either Delegated Control or Event-based dispatch as described [here](../tutorial/dispatch#types-of-dispatch).
### Telemetry
If we are integrating directly with the heating system we'll need:
* Power `kW`
* Temperature `°C`
* Outside temperature `°C` *Optional*
If we're optimizing via the thermostat, temperature alone suffices.
We can retrieve these via polling or webhook.
### Dispatch
We'll either need to control power or temperature, if you're integrating [via thermostat](#control-via-thermostat).
## Next steps
Get started dispatching assets
Powerful APIs for advanced integrations