When I designed this house I had the advantage of living next door for a few years before I started doodling floor plans. I tried the make the house very Energy Efficient starting with designing the house as close to a square as I could which gives you the maximum interior space to exterior wall ratio, and I made them six inches thick instead of four to be able to get a higher R-Value. I had an energy audit of my drawings before I Applied for my permits and they seemed confidant I only needed a 3.5 ton unit for the main floor and a 1.5 for the guest suite since I didn't expect it to get much use and whether hot or cold two hours after you show up on my doorstep unannounced and I run up to kick them on it's pretty cozy up there.
The Attic also in principle has R-60 but its not spread out very well. I couldn't find anyone to help me so I had two huge bundles of the stuff and the blower machine, snuck the hundred foot blower line up there through the eave and then tied it high on the rafters. After a few tries I came up with a system of staring in the far corner blowing in ten bags, the going back up in the attic moving the hose about ten feet and another ten bags and so on until I went through the hundred some bails I bought on sale of course.
This left me with a bunch of mounds and I then went up there with a broom and a mask and spread it all out as even as I could being sure to leave the walkways I have to get around up there uncovered. I insulated under them with fiberglass batts as I went since I didn't want any voids knocking down my R-Value.