Anyone done Under Dash A/C ?

That dealer install airtemp is the bombdiggity, but a hella big bastard. I do love the chrome and woodgrain though. Where did they punch the holes in the firewall for the hoses on the dealer install setup? My 67 and my sons 69 are factory non A/C cars, i am thinking with black interiors in west Texas that we are going to need A/C. But also heaters as it does get down into the teens in the winter.