# What is active cooling on a heat pump?

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Updated: 2026-05-22
Language: en-GB

Explains active cooling — running a heat pump’s refrigerant cycle in reverse to remove heat from a building — and how it differs from heating-only operation.

Active cooling uses a heat pump compressor to move heat out of a building —
the reverse of heating mode.

- A reversible Vaillant aroTHERM heats in winter and cools in summer.
- It needs: a cooling-capable model, the coding resistor, installer activation,
  and cooling-suitable emitters (fan coils, not radiators).

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