On Tue, 1 Mar 2016 10:32:53 -0800 (PST), bob_villain
wrote:

On Tuesday, March 1, 2016 at 10:40:50 AM UTC-6, wrote:
I have to keep an air compressor inside a heated part of the house,
because it wont start outdoors in cold weather. But I have to run a long
air hose thru the house, then leave my door part way open during cold
weather, in order to pump up a tire. I want to pipe the air thru the
house and bring it outside near where I park vehicles, and put an air
coupler out there.

I've seen a lot of service garages use steel pipe, but that would be
costly and a lot of work to install. PEX would be much cheaper and
easier to install. But can it handle the air pressure? My compressor
shuts off around 100lbs. I would not leave it under pressure, it would
only be turned on when I need to use it.

I'd give it a shot...mine doesn't work in the cold garage either!

None of them work well in freezing weather. The oil gets real stiff, and
there is always some water in the air tank as well as the fittings and
stuff. If that moisture freezes, there is no way the compressor will
start. Either the breaker blows, or the compressor or the belt is
damaged. Even if nothing is damaged, running them in cold weather is
really hard on the compressor.

I think trader4 had a good suggestion, which I had not thought of, which
is to just run air hose thru the house. I can screw it to a coupler and
short piece of galv pipe where it goes thru the wall to the outside,
then put a regular air "snap coupler" on the outside. That would
probably be the easiest and cost about the same as PEX. Good suggestion!

I do know that outside snap coupler would need a cover over it when it's
not in use, because they will get water in them, and cant be used once
then freeze up. But I'm sure I can find some sort of plastic bottle to
shove over it when it's not in use.

Actually, the more I think about this, I would not even have to run a
permanent line thru the house. Just put a piece of galv pipe thru the
wall, with the proper (male / female) snap coupler ends on both the
inside and outside. That way, I can just coil up the air hose inside the
house and only unroll it when I need it, and snap it onto that pipe.
THe pipe can be held in the wall with an electrical ground rod clamp on
both the inside and outside and of course caulk around the outside part.
That way all I need is about 8" of pipe and the two snap couplers. I
already have enough air hose. In order to go outside now, I need to use
two 50 foot hoses. Instead I'll just use one hose indoors and one
outdoors.

Yep, that's the solution I'm gonna do....