G'day Lads, thoughts on Keeprite c4a3 and c4a4 in a 1.5 ton? Is it worth the extra cost for the c4a4 as far as quietness or build quality goes? What is the difference between the two other than 1 seer? I see in the 1.5 ton size the weight difference between them is 54 lbs. What did they take out? Thanks for all replies.