Sometimes relying on dubious savings by reducing the number of radiators, electric warm floor trying to use to maintain the temperature indoor air. This option is possible, for example, in a small bathroom without windows. However, the miser pays twice! If you have a spacious bathroom with windows to the garden, it is best to establish where the radiator. Otherwise would be permanently interfere too hot or cold floor: electric floor heating is turned off upon reaching the current temperature to a certain threshold. And as the inertia of the system is large and the degree of floor heating is not being tracked, then maintaining the desired temperature of air temperature of the floor will ride against your wishes.
Ventilation (fresh air and not only) is wrong to perceive the ventilation system as a set of air ducts, diffusers and fans, suitable only for it to feed air into the room from outside and pull it out. Outside air should be clean and in different seasons wet or dry, heated or cooled. Some of these problems can be distributed between the ventilation and air conditioning. However, full ventilation system can not do without and hood. Forced ventilation in the room gives the required volume of air per hour. This air should be cleaned filters, and in winter is heated to the desired temperature. As in the case of floor heating, heaters may be water or electric. Cool air in summer can occur in the heat exchanger, part of the system ventilation or air conditioning in each room.