Homeowners choosing underfloor heating often discover its main drawback only after living with it: the system reacts slowly to sudden weather changes. Because warmth is stored in a thick screed, rooms can overheat in milder weather and warm up far too slowly during cold snaps.
According to an article published by WNP.PL on Aug. 3, 2026, underfloor heating has evolved from a fairly exclusive modern solution into one of the most frequently chosen heating systems in new buildings. More and more owners are selecting it as the main source of warmth in single-family houses, gradually pushing traditional radiators out of new projects.
What makes it appealing is the way heat spreads. Instead of being emitted from a single radiator, it radiates across the whole floor, producing an even indoor temperature and greater comfort, as Onet points out. The installation also works very well with heat pumps and other low-temperature sources, allowing households to limit energy use while maintaining efficiency.
Thermal inertia is a double-edged sword
The same design that provides such even warmth also creates its biggest inconvenience. Heating elements are hidden under a layer of screed, which acts as a large heat reservoir. This gives the floor excellent heat retention, but it also means the system is much slower than radiators to adjust after a thermostat change.
Even after the heating has been turned down or off, the screed keeps releasing heat. During quick weather swings, especially when temperatures rise unexpectedly, rooms can become overheated and reach levels higher than the settings suggest.
Spring and autumn pose the biggest challenge
The reverse is just as troublesome. If a sudden cold front arrives, as often happens in early spring or autumn, underfloor heating needs substantially more time to raise indoor temperatures than a traditional radiator-based installation would need.
This delayed response does not cancel out the system’s advantages. Its compatibility with heat pumps and low-temperature heating remains a strong argument in its favor, as is the uniform thermal comfort it provides. Still, anyone planning to install it should be aware of the limitations connected to thermal inertia and adjust their expectations accordingly.
Source: WNP.PL, Photo: Shutterstock/Spok83
