To tell the truth, I don't think it is that difficult to explain:
The first states what I believe and expect to be true: a lower c/w will give better temps.
The second is an admission that I do not know everything and admit that there may well be factors that I am unaware of that could change this...although I find it to be unlikely.
I also don't believe in ghosts haunting houses, but since I lack evidence to prove that it is impossible, I will merely say that I don't find it likely to happen.