The operating cost of floor radiant heating how exactly calculated?

The operating cost of floor radiant heating can often be better than heating, central air conditioning and other traditional convection heating system reduce 20%-40%.

Now many articles on the running cost of the lack of comparability:

First room floor, room facing, wall insulation, window size and whether to adopt double insulating glass so the House thermal insulation, thermal conditions vary greatly, for example single Villa faceted wall thermal direct contact with the outside world, if more insulation does not do well, the room to reach the same temperature, the quantity of heat may be doubled.

Secondly, each family's habits, a different family of comfortable temperature difference between 2 to 5 degrees centigrade and family habits and evening twice-a-half-hour window for natural ventilation, the impact on operating costs. Floor heating radiant heating, heating way consistent with the human physiological demand curve, indoor temperature even lower than convection heating for 2 to 5 ° c, could make it the same warm feeling, while the floor heating temperature low temperature heat source, heat loss significantly reduce, the thermal efficiency is greatly enhanced with convection heating, which can cause the system to run costs 20 ~ 30%. If you select, use the control system properly, can not only enhance the room comfort, you can enable the system to reduce operating costs by 40% and even more.