Degree C graph alignment with degree F

Hi,

I very much like the temperature graphs, but it would be nice when using C as units it as more in line with F.

Since the increments are 10 degree in both that only gives me four graphs ranging from a ice cold winter day to a hot summer day. Maybe it could be changed to 5 degrees?

And I think there is something wrong with the efficiency, it's displayed in a 0.X format, so I guess it's not displayed in %.

Thanks!