What is A ++ rating?

What is A ++ rating?

Under this system each + sign is taken to be equivalent to an energy efficiency of 10% , so A+ is equal to A-10%, A++ = A-20% and A+++ = A-30%; for appliances that have a greater energy efficiency standard than A+++ the rating A-40% could be used, for example, which would mean the appliance is 40% more efficient than … Oct 13, 2010