I personally prefer to have the CO2 outside but its really just that - preference. If you keep it inside, you lose a little space that could be used for kegs, but you save the space and aesthetics from having it outside. Outside gives you more room, but can be more susceptible to damage and can be ugly with the gas hose and the tank.
If you run it outside, just run one line from the regulator to the inside, and have that attached to a manifold that is mounted inside and distributes to the different kegs.
4 taps for a fridge is just fine assuming you can put all 4 kegs inside, which shouldn't be a problem.
I love the sound of an airlock bubbling in the morning. It sounds like.....VICTORY.
Originally Posted by TxBrew
It's now degenerating into nu uh and uh huhs and it no longer serves a point.