I have just read a post from a few years back and have noticed this
"Most condensors operate at a close to estimated temperature of 30 degrees F over ambient.
So if we know what the ambient is and add 30 degrees F to it we can safely estimate,

Lets take a look at the suction pressure
similiar as above excecpt normal operating sytems have an average coil temp of 15 degrees f
below temp controlled area".

But if i were to convert these temps to DegC then 30F would be -1.1DegC
and 15f would be -9.44, surely this cant be right for si units?