Just found this thread. Most of this is documented in a thread I started when I was just figuring stuff out (
here) but seems it's worthy of this thread too.
For years I had an cheap Husky compressor hooked up to the plumbing I had installed when we built the garage. I finally decided to do things right this year and with the help of GJ I now have the following:
SnapOn BRA5140H 40 gallon, 5.0 HP, 175 max. PSI compressor plumbed in series with an old Craftsman 60 gallon tank. I purchased both via Craigslist for $850. The compressor is in basically new condition. I have adjusted it down to output only 150 PSI given the old Crafstaman tank is only rated at 150 PSI. And I have no need for more than 150 PSI.
Both tanks drain via an automatic drain valve.
The devices mounted on the wall are two pump start relays that are used to turn the power to the compressor (the relay on the right) and the auto-drain (the relay on the left) on or off using my home control system. I currently have it setup to power on when the garage doors open, lights are turned on, or motion is detected in the garage. It then stays on for 1 hour unless occupancy is detected again.
The compressor/tank are mounted in the attic above the "far" stall of the the 3 car garage. This space was intended for a compressor when I built the house and therefore I already had copper plumbed up there. I ended up running another copper run while installing it for another outlet in the ceiling (see below). Having the compressor in the attic is great; it really quiets it down and keeps it out of the way. Having the automated power on/off gives me great peace of mind that the compressor won't run out of control if a fitting goes bad.
This shot shows where the attic is. There is a door you can't see in this picture that is normally closed.
I have three drops: One on the far side of the garage where I used to have the old Husky compressor. It is capped off. One is on the back wall by the drill press in the picture below. It also is just capped off for now, but I do have a filter/regulator for it when I decide to get a blast cabinet.
The other drop is mounted on the ceiling. It has two filter/regulators. One set at ~80psi and connected to my Griot's reel. This runs my impact wrench etc... Te other filter/regulator is set to 150psi and it is used to power my BendPak RJ-45 bridge jack on my lift. I have not yet hooked up the permanent hose from that coupling to the lift; it's on my list of things to do.
I'm really happy with the way this turned out. And it's great having air just available all the time. I wish I would have done this earlier!