[bleepblorp]

Underfloor has to be done right (installed on materials with a very low thermal mass) or it will be horrible in buildings that have a highly variable heating load.

Underfloor systems applied directly to concrete subfloors will take many hours to change temperature. In climates with a large spread between daytime and nighttime temperatures, such underfloor heating systems will either overheat the building during the day or be unable to ramp up quickly enough to heat at night.

Also be aware that underfloor heating systems are only compatible with a subset of flooring materials and don't like area rugs.