# Will a heat pump cool through radiators?

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

Why standard radiators are not an effective way to deliver cooling from a heat pump, and what to use instead.

A heat pump cannot usefully cool a home through standard radiators.

- Radiators have too little surface area and no fan to move air in cooling mode.
- Chilled radiators risk condensation, with no tray or drain to manage it.
- Effective cooling uses fan coil units, which move air across a chilled coil.
- Underfloor heating can cool with dew-point control, giving gentle cooling.
- A cooling-capable Vaillant heat pump still needs the cooling resistor fitted.
- Price of the resistor: GBP 47.50. Condition: new, genuine OEM.

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