# Heat pump cooling and condensation: dew point explained

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

How chilled-water cooling can cause condensation, what dew-point control does, and why condensate management matters.

Heat pump cooling circulates chilled water, which can drop surfaces below the
dew point and cause condensation. Managing this is the core engineering task.

- Dew point: the temperature at which air saturates and moisture condenses.
- Vaillant sensoCOMFORT uses dew-point monitoring and a minimum cooling flow temp.
- The control keeps chilled water warm enough that surfaces stay above the dew point.
- Fan coils still produce condensate — every indoor unit needs a tray and drain.
- Chilled pipework should be insulated so it does not sweat.
- Cooling is an engineering issue, not just a software setting.

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