Quite simply, when you turn the thermostat on an air conditioner component up or down 1° C, you are jumping farther up or farther down than you would be on the Fahrenheit scale.
20° C is about 73° F, and initially, I was harshly comfortable with this temperature on our first evening in the hotel, but throughout the course of the evening, it felt too cold, & my partner was frosty.
I decided to turn it up to 21° C. I did the conversion real quick in a web browser & found that it was now 74.8° F! Still, my partner complained that it was too cold, however once again, I turned up the temperature 1° C & looked & saw that was the equivalent of 73.6° F; So ultimately, a 2° difference in Celsius meant a 3.6° difference in Fahrenheit. So, I was left with the impression that Fahrenheit is simply better for Heating & A/C systems than Celsius. Fahrenheit ultimately gives you more control over the temperature in a room.