When were Airstreams first pre-wired for Air-Conditioning at the center vent opening?
According to Airstream records they did not start pre-wiring for air-conditioning until 1962-1964 (depending on model/plant). You can tell if there is a spare 20amp breaker in the electrical control box. In the few years prior that AC was available, wiring was run from the fuse panel on custom AC installations only.
