Cooling with Floor Heating?

Better not.

The idea sounds tempting: In summer, simply send cold water through the Floor Heating – and the room will remain pleasantly cool. In practice, unfortunately, it looks different.

Brief summary

• The basic principle of underfloor cooling: The idea of running cold water through the pipes of an existing underfloor heating system in summer to extract heat from a room is technically feasible, but quickly reaches its limits in practice regarding living comfort.

• The alternative: While underfloor cooling is often perceived as uncomfortable due to direct skin contact when walking barefoot, and carpets or furniture block the active cooling surface, wall and ceiling cooling systems offer a contactless, undisturbed alternative.

• Functionality and the physical limit: To prevent the formation of condensate (moisture) on the floor covering, the flow temperature cannot be lowered indefinitely. Due to this necessary limitation of the surface temperature, the maximum cooling capacity of the floor remains limited as well.

• Impact on health and coziness: Since the human body is extremely sensitive to cold through the soles of the feet, a cooled floor often creates an uncomfortable chill instead of refreshing coolness. For a truly cozy, silent, and draft-free indoor climate, systems on the wall or ceiling are significantly superior to the floor.

Because: The floor actually gets cold. And you notice it – especially on your feet. Everyone knows this unpleasant feeling of cold tiles or floors. The coziness that you actually want is missing. Instead of a refreshing coolness, an uncomfortable room climate quickly develops. Cooling via underfloor heating is technically possible, but rarely comfortable. It just doesn't feel good – especially not barefoot.

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Why the floor quickly reaches its limits when cooling

Although underfloor heating can also be operated with cool water in summer, this does not automatically mean that it will provide good cooling. The floor must not become too cold; otherwise, it feels uncomfortable—especially barefoot. Additionally, the surface temperature must be chosen so that no moisture forms on the floor.

This is exactly why the cooling capacity of underfloor cooling is limited. The flow temperature cannot be lowered arbitrarily. Floor coverings, carpets, or furniture also reduce the active area and make heat exchange more difficult. Therefore, the floor can only absorb a part of the heat from the room.

For pleasant cooling, walls and ceilings are therefore much better suited. These surfaces are in large-scale exchange with the room, are hardly restricted by furniture, and have no direct contact with the soles of the feet. This way, heat can be gently absorbed—without cold feet, without drafts, and without disturbing noises.

Pleasantly cool: Why walls and ceilings are superior to the floor

Especially in times of increasing hot days, comfortable cooling is becoming more important. But instead of cooling through the floor – and thus accepting cold feet or even a chill – modern systems rely on wall or ceiling cooling. 

The crucial difference: With walls and ceilings, our body hardly or not at all comes into direct contact. Unlike the floor, which we constantly walk on barefoot or with thin footwear, these surfaces remain "distant." This allows for gentle, barely noticeable cooling through radiation – without it feeling unpleasantly cold. This way, comfort is maintained even on hot days.

Cooling over the wall

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Cooling via the ceiling.

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