Third person was a HVAC person, put the neutral and ground on the same bar and install a ground rod next to the condenser and attached to the condenser.

I'd rather do maintenance on one central condensing unit than several window units.

Ask the HVAC guy how much it costs to install a new AC condenser or a new furnace.

., condensation on AC coils or water in your lungs) to form sulfuric acid (H2SO4) and hydrogen gas (H2).

Everything Jon says is spot on, so I won't rehash the numbers.Definitely condense your proposal - bullet points would work.

Just to update, the condenser needed cleaning, and freon needed recharging.

I am thinking of having a mini-split system installed in the attic of a rental, with the condenser on the roof.

If you are wondering what pets do to the central AC units, here is something a little more than just speculation.I have a triplex, where each unit has the same exact central AC handlers and condensers and same age.December 2014, I had an air conditioning company cleaned all three evaporator coils - pulled the coils out and acid wash them.Here is a picture of what the coil looked like immediately after the cleaning.I personally change the filter in all three units once a month.Now, only eight months later, units 1 & 2's coils look about the same with just a little more dust.Unit 3's coil look like this.Same size apartment, same central AC units, same age, all cleaned at the same time, had filter changed by me every month at the same time.The only difference is unit 3 has two dogs, one 40 pounds and one 50 pounds.I am not against pets, but thought I would share this.

How do I condense that feeling of knowing an area down from decades into days?

We owned it four yrs, and put a roof and condenser units in both sides.