1. The temperature of the additive. At least if you count in degrees Celsius or in Kelvins. About Fahrenheit will not tell, did not use.
2. The amount of the exhaust cooling system heat is proportional to the Delta temperature. The non-linear dependence of thermal conductivity of materials, resistances of transistors and other usually small and can be ignored.
3. Therefore, theoretically do with the same system parameters cooling temperature of the cooled CPU will decrease by the same Delta temperature, which decreased the temperature of the environment.
4. But in practice, it is better not to check. Humidity in winter is large, frequent temperature changes -> the condensate.