xsn10s
You are correct about the newer systems being more efficient.
We just had a AC Tech come over to check out our system. I asked him about the older systems being better and he said the one thing about older systems is that they ran R-22 Feron which is better than the 410A that runs now. The new system we have is a two-stage unit. It runs the first stage (LOW) for a long time that save electricity and when it needs more "Cold or Hot" the second stage (High) kicks in.
He said that if these units ran R-22 they would be much more efficient with Colder and Hotter air.
He also said that the EPA is making Air-condition /Heat Pump Manufacturing Companies to start using a different Feron the 410A next year.
He checked out our system and it was about 1 lb low on 410A which can make all the difference between the system switching from Low to High.
He said the when the system was put in it was very hot out and the tech charging it probably didn't check the system in the High load and it was off 1 LB. OR we can have a LEAK, but since we always had this issue it was most likely not charged properly when installed. We still got charged $89.00 for a Service visit.
I said that we should not be charged a service if the System was not Properly CHARGED with 410A. He said take it up with the management, but it will be hard to say that it was not properly charged and maybe we have a leak.
Hopefully this works. If we do have a leak the warranty will only cover the parts and then us paying about $1K for labor & Freon.