According to historians, one of the reasons they were introduced was to make a room with high ceilings feel cozier, and it was an optical trick to lower the ceiling height down. To keep with the style, door knobs may have been installed high.
Another reason offered by historians is that people with limited mobility might be able to reach them easier. This seems somewhat contradictory to me because if they were unable to open the door, then how could they reach the knob? But maybe there's a way they could open the door first and then reach up high to turn the knob? I don't know.
Finally, some houses had multiple levels above ground. If these doors opened onto the third floor, then they would be high enough for someone in a wheelchair to open them.
Because it was (sometimes) more efficient A high ceiling allowed hot air to ascend, leaving a (slightly) cooler one at the people's level in warmer climes with no A/C equipment. It was notably beneficial for providing insulation against heat emanating from the ceilings on the last storey of the structures.
The higher the ceiling, the colder it will be even when there are people around who require warmth. This is because warm air rises and so escapes through the roof. Ceilings also prevent light coming in through windows being blocked out by furniture or boxes. This would happen if the floors were not raised enough above head height.
Old houses tend to have high ceilings because builders used as much space as possible to make rooms as large as possible. The more space you can fit into a building, the more rooms you can have. So, the reason old houses have high ceilings is because they're full of room!
However, not all houses built before 1978 had high ceilings. New buildings were designed with energy efficiency in mind, so they usually have lower ceilings to reduce the loss of heat through the roof. Houses built after 1978 are not as energy efficient so they still have high ceilings to allow more light into them and provide more privacy between bedrooms.
There are several ways to reduce the ceiling height of an existing house.
The "Stack Effect" pressure that high-rise structures suffer is created by air rushing through the building. At the same time, revolving doors allow enormous crowds to enter and exit. A rotating door schematic as seen from above. People like to feel important when entering a room, so having the door knob on a console table makes them feel special.
Another reason may be to reduce heating and cooling costs. By allowing cross-contamination between floors, people will use less energy for heating and cooling. This is because no one wants to walk into a cold room or enter an already heated room.
Also, not all high-rises have parking garages. If there are no parking spaces, then these doors are useful for reducing congestion. Finally, they can also be used for decoration. Some developers choose to put them in lobbies to create a more welcoming environment for guests.
Here's how revolving doors work: When someone opens the door, it starts rotating slowly in one direction. As it spins, the door sweeps open to let in fresh air and closed to prevent people from escaping out the opening. The faster the door rotates, the harder it is for people to get out quickly before the door closes again. This is why most high-rise buildings have slow-moving revolving doors.
The biggest advantage of placing the lock that far up (around chin level) is that the door will be considerably more difficult to kick through. Placing the deadbolt in the standard placement of 5-1/2" from the handle/knob provides the perfect height for an effortless kick to the locks. This also means that if someone does get access to your locked door, they'll have to climb over the bolt to enter.
The reason all the door knobs are so high in England is so children can't reach them! It's normal practice for house owners to raise the level of the knob well above head height for child safety.
There are two types of door knob in use in England: the upper and lower halves of a single piece of brass or steel. The parts are separated by a vertical plane across which it is easy for a young child to slip. If you want to make sure your door isn't easily opened by a toddler, install a lock with a high enough lever to be out of reach.
If you want to make sure no one can open your door without the correct key, then this is the option for you. These keys are called "lockers" because they form a lid for the hole where the doorknob fits. They're available in various sizes for different doors. To open the door from inside, someone needs to retrieve the locker from its resting place and carry it to the door they want to open.