To calculate the change in temperature, subtract the initial temperature from the final temperature. Example: 84.2 degree Fahrenheit - 41 degrees Fahrenheit = 43.2 degrees Fahrenheit. The temperature from morning to afternoon changed by 43.2 degrees Fahrenheit.
It needs 12 volts so it will be the standard modern power supply provides 12 volts of power.
Wiring a 220 volt electrical outlet will allow you to not only power an electric dryer, but also any additional heavy power tools, such as an air compressor or generator. A 220 volt outlet is double the voltage of a typical home outlet and requires the use of an electrical cable with four wires.