A wet heating system moves heat from a source, through circulating water, into emitters such as radiators and then into rooms. Following that chain helps you ask a better question about a cold room.

A useful model does not identify every fault. Controls, insulation, ventilation, water condition and the design of the system also affect the result. This lesson explains an energy relationship; it does not instruct you to adjust a boiler, open equipment or diagnose a fault from one temperature.