I am going to do my first film processing at home. Ilford suggests 20 degree Celsius for Ilfosol. The instruction says that start with 23 degree and eventually it will come down to 20 degree because of heat loss. But when I checked water at 20 degree, it is absolutely cold. I was thinking that it would be warm at 20. My question is, is my thermometer correct? Is it really cold at 20 degree celsius? May be I am having this feeling because I am checking the water temperature for the first time in my life Please clear my doubt regarding this. As a side note, here in Dubai, there is no such thing called 'heat loss'. There is only 'heat gain' because the current temperature in Dubai is 43 degree celsius . So I have to start with 18 or 19 degree to reach 20 degree during development.