Hi Aron, Can i check, what is the difference between the following : 1) Class 1 versus Class 0. Which is better ? 2) Thickness of Insulation. 1/2 inch, 3/8 inch Which one should a normal house get ? If get R410a, should get thicker ? 3) Type of Insulation. K-Flex versus Armaflex. Which is better ? 4) Piping. G22, 23, 24 Which is better, what does all the numbers stand for ? Thanks in advance for answering my queries!! Henry