> 1. A 3/4" or so conduit for pulling phone, network and coax (or anything
> else low voltage)
Make it bigger - I used 2". If nothing else, it makes the pull easier. Pull
everything you think you're going to want. I recommend one of the
multi-conductor bundles that have a couple of phone lines and a couple
of coax runs all together.
> 2. Maybe a cold water branch and then put one of those on demand hot water
> heaters out there
Absolutely. I ended up using a small tank heater because I didn't
size the circuit quite right (not enough research) - the demand heaters
want 20A @ 220, if you can find them. Most sold are gas.
> 3. I could see how a gas line out there might come in handy, so how about
> one of those? A heater would be nice.
See above. The gas demand heaters seem easier to find. I use a radiant
electric heater on thermostat - I didn't want to mess with gas in the
garage (and didn't want to worry about a flue).
> 4. What about running an air line back to the house? Can't really think of
> why I'd need it at the moment, but what the heck? Might come in handy if I
> decide to mount the compressor up in the loft and can no longer move it
I've never considered it useful, but others do. While you have the trench
open ... just make sure you put in a cutoff before it enters the trench,
in case it develops a leak!
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