Take Gree air conditioner as an example. How to adjust the air conditioner back to degrees Celsius:

1. In the stopped state, press the "mode" key and the "-" of temperature adjustment at the same time. " button for about 5 seconds to switch between Fahrenheit and Celsius temperatures.

2. You can use an object such as a bamboo stick to click the small button inside the "reset" hole on the remote control to reset the remote control.

3. It is recommended to look for a copy of the manufacturer's remote control instruction manual, which contains detailed instructions.

Air conditioning, that is, air conditioner, refers to equipment that uses manual means to adjust and control parameters such as temperature, humidity, cleanliness, and flow rate of ambient air in a building/structure. Most of them use refrigerant to evaporate or condense under the action of the compressor, thereby causing the evaporation or condensation of the surrounding air to achieve the purpose of changing the temperature and humidity.

The original air conditioners and refrigerators used toxic gases such as ammonia and methyl chloride. The leakage of this type of gas can cause major accidents. Thomas Midgley invented chlorofluorocarbon gas in 1928 and named it Freon. This refrigerant is much safer for humans, but is harmful to the atmospheric ozone layer. Freon is DuPont's trademark for CFC, HCFC or HFC refrigerants, each of which also includes a number to indicate the molecular makeup of its ingredients. Among them, R-22HCFC refrigerant, which is the most widely used in the field of direct evaporative moderate cooling products, will stop being used in new production equipment starting in 2010, and will be completely stopped in 2020. R-11 and R-12 have been discontinued in the United States. As an alternative, some ozone-friendly refrigerants have been put into use, including the refrigerant R-410A under the trade name "Puron". New environmentally friendly refrigerants R290 and R32 are also gradually entering the market. The R290 molecule only contains carbon and hydrogen, does not contain chlorine and fluorine, and has zero ozone-destroying potential.