---
title: Function »Heating– Cooling«
description: "Water-based surface temperature control – CO input (Using the thermostat without Alpha-Direct Base module) ![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__CO-Eingang-2.png) The RDWM 210×1-N7 has a CO-**input**, which can be used to automatically switch between the “heating” and “cooling” operating modes, e.g., via a signal from…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/function-heating-cooling/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# Function »Heating– Cooling«

Water-based surface temperature control – CO input
(Using the thermostat without Alpha-Direct Base module)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__CO-Eingang-2.png)

The RDWM 210×1-N7 has a CO-**input**, which can be used to automatically switch between the “heating” and “cooling” operating modes, e.g., via a signal from a heat pump.

The corresponding mode is not displayed on the display.

If the thermostat has been parameterized to control an electric underfloor heating system, the cooling function is not available.