Large air-conditioning enterprises generally do not purchase materials now, but produce them now. Generally, in order to avoid the price fluctuation of raw materials, they will make some futures such as steel and copper, and the inventory of finished products 1 year is normal, so the factors of price increase will not be immediately reflected in the market, which may be delayed for some time. After 2004, the average unit price of air-conditioning market rose all the way, reflecting the impact of rising raw material prices.