Most of the coaches made until 1988 had roof airs. There were some roof airs and some basements airs for a couple of years. By 1990 almost all of the Newells (the 2000 Series) had basement airs. I am aware of a couple of 2001 coaches with roof airs. However, 2003 is when the major shift back to roof air occurred. By that time most of the Newells had 3 or 4 slides and basement airs were not easy to incorporate into multiple slide units. There will be occasional exceptions.
The basement A/C units are basically residential A/C split units in design. They are smaller than residential units and, hopefully, designed to take the rigors of mobile use. The two companies that supplied basement A/C units to Newell are both out of business today.
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