Apart from considerations such as the size of the piano, where it will look attractive in the room, and convenience for playing, there are a number of other factors to consider. An even temperature will help to maintain the tuning stability, so always try to keep it away from any heat sources such as central heating, radiators and fires. Changes in humidity can also be detrimental to the well being of a piano, particularly the drying effect of central heating. If the piano is an upright, it needs to be placed against a wall as they are inherently unstable. It is also preferable to avoid direct sunlight from falling onto the casework, both from the point of view of the heating effect on the instrument as a whole, and the fading effect sunlight can have on the polish.