Source: measure the whole world
China is a large country with a large population, urban land is limited, which leads to a very tight land resources, as a family home, is bound to occupy a large amount of land, the rising cost of land leads to higher and higher prices for housing
Many people are two generations of the downpayment, ten years of mortgage repayment, so expensive houses naturally have to be well picked.
As I said earlier, the cost of land is expensive, so in order to save land resources, residential buildings are now higher and higher. Twenty-story high-rise in a few, dense households, which leads to the whole building of the water supply and power supply pressure increased, the traditional low-rise residential buildings is the refrigeration machine, pumps and other large equipment in the basement, the need for air cooling cooling towers, blowers placed on the top floor, because of the small number of households so that the distribution will be able to meet the demand for the whole building.
These equipments will produce a lot of heat and radiation, part of the equipment will work when the vibration will be very strong, if the residence in the equipment layer will be very affected, so these equipments in the planning of the time will be concentrated in the basement and the top floor, does not affect the residents.
But as the floors get higher and higher and the homes get denser and denser, this kind of planning can no longer meet the needs of people's lives.
Particularly in the upper floors, it is difficult to send water up, so there will be an equipment floor in the middle floors to meet the needs of high-rise residents living.
Twenty-floor buildings are generally set between the tenth and fifteenth floor, and so on, usually in the middle floor, this layer will be arranged in a variety of pipelines and heat exchangers, pumps, etc., these things work will seriously interfere with the normal life, emit a lot of heat.
Winter is fine, if it is summer, it will be very hot. Therefore, when shopping for housing, we must avoid the top floor, the first floor and the middle of the equipment layer, these places working machines are particularly large, noisy radiation is high, in order to their own health and quality of life, do not want to buy these floors on the cheap.