That includes purchasing a finishing nailer and and 2,000 nails for 160.18.

In 2006 I bought a home built in 1999 and the coil went out during the first year I was there.  

Recently I had an evaporator coil go out in a 3 ton Goodman AC unit.

The coil froze up - the wife was blaming me - after they lived in the house for years.

I actually have detailed pictures of my house before drywall so I remember where they put the blocking and nailers on block to more easily find it later.

Installing a traditional a/c would either be an air handler or a furnace with the ac coil on top and an outside condenser both options would need duct work.  

(they are the same) They use heavier duty parts, they were the first to use all aluminum evap coils, they have low pressure sensors/switches to protect your unit, they have been innovating more efficient motors, blower housings, electronics beyond other brands. 

He also kept trying to put words in their mouths, claiming there was mold in the central air unit, but there was nothing more than filthy looking coils that an AC tech company cleaned out.The PM is placing it in writing this morning that he requested all of his money back, we offered all of his money back, and he's refusing to leave.

My problem is going to be handing over the reins of the real estate when I either get too old or the estate when I "shuffle off the mortal coil".

When we send a tech out they usually find dirty coils and a dirty filter if there is one at all.