I installed AC/Heat in a nova wagon. The system worked like it was supposed to, but I was not at all happy with the service or advice I got from the company I used. I bought from Classic Auto Air. I learned a ton, and would be glad to help you if you have specific questions.
Most all of the units are the same Vintage Air, Classic Auto, or some package deal from a supplier like Jcarter. The technology isn't any different, just the label on the box. I ended up spending ~$1500 when I was done.
