I have done this several times.
When I was a kid (a long time ago) I worked for a pro-painter. We sprayed the interiors of homes with a 20 gallon compressor and a Binks cup with gun combo. (quart size from what I remember) In a the larger areas we used a 2.5 gallon pressure tank and the gun by itself fed by a 25 foot hose with line. Remember to tape off mask off all stuff you do not want painted.
The best is when it is new construction, you only have to mask off the window with a hammer tacker and visqueen.