Radiant heating and cooling systems are provided with warm water in winter and cold water in summer. The systems use water pipes which heat or cool surfaces in the room, for example the floor, the ceiling, or a wall, which then emit this warm/cool temperature to the room itself. These systems are extremely energy-efficient, especially when used together with renewable energies, for example in combination with a heat pump as energy source. This combination reduces a buildings’ primary energy consumption and CO2 emissions. In winter, the floor surface can be heated with a lower temperature than radiators, as it covers a bigger area. As a result, the system gets even more efficient. Whether heating or cooling, radiant systems spread the heat or cold evenly, thus ensuring a pleasant temperature at all times. For integrating the cooling case, it is recommended to lay the pipes at a closer distance during the construction phase.
When a room temperature control for the radiant heating system is also used for cooling, its technology has to be ‘cooling-ready’, thus facilitating a switch from heating to cooling as required. Systems such as the Uponor Smatrix control technology open the manifold valves for summer cooling when the ambient temperature rises – i.e., working on exactly the opposite principle as in winter. In heating mode, the valves close when the ambient temperature rises.