and air conditioning systems
Ventilation and/or air conditioning systems affect the climate of a room. The conditions due to the building and heating are not easy to describe in a few words, it is best asking a specialist. As a rule:
are usually fitted under windows. They usually function by convection heating, giving off radiation heat as well. It should be avoided to locate an instrument near to such heating. Convector heaters are usually located on walls or on the floor and work only through the convection of heat. The instrument should never be located directly above or below such a source.
Air heating systems
Produce close to the air vent a continious stream of air, which is damaging for pianos. An instrument should never stand directly before, or under, the air vent.
Produce a relative low relative air circulation in the room, at low temperature. Correctly set underfloor heating produces a temperature of between 21° and 23° just above the floor. The air temperature sinks with increasing distance from the floor. The temperature of the rising air therefore and the direct heat therefore have little effect of grand pianos. With upright pianos, an isolation between the floor and the sockel of the instrument. Here, your specialist dealer can advice you further.
are useful in rooms with a constant relative low humidity. These however must be the correct size for the room and work correctly. They can not avoid damages to an instrument which is subjected to changing or high humidity levels.
Full Air conditioning
are useful for good pianoforte instruments if they keep the relative humidity in air conditioned rooms in a range from 35% to 70%, thus presenting large changes in the humidity (ideal level for pianoforte instruments: 40% to 60%).