# Underfloor Cooling with a Vaillant Heat Pump

URL: https://www.vheatc.site/underfloor-cooling-with-a-vaillant-heat-pump
Canonical-URL: https://www.vheatc.site/underfloor-cooling-with-a-vaillant-heat-pump
Updated: 2026-10-20
Language: en-GB

How underfloor heating can give gentle cooling from a Vaillant heat pump, why dew-point control is essential, and what has to be in place first.

Underfloor heating can give gentle cooling from a Vaillant heat pump.

- Cool water runs through the floor pipes; the large floor area absorbs heat.
- Dew-point control is essential so the floor never collects condensation.
- Vaillant sensoCOMFORT includes dew-point monitoring.
- It cools gently but does not dehumidify like a fan coil.
- An aroTHERM Plus supplied without cooling needs the cooling plug first.

Buy on eBay (seller boarder895) — the same plug in two packs:
- 0020266328 (Vaillant small-parts bag, labelled with the part number): https://www.vheatc.site/go/ebay/0020266328
- 0020269259 (Original Vaillant box, labelled “Coding plug, cooling function”): https://www.vheatc.site/go/ebay/0020269259