With 80,000 + BTUs available for OTR it has excess capacity. So on a 45 foot coach 4 AC units of 13,000 to 15,000 BTUs should be ample.

The key however is to never let the inside temps get away from you.

We learned the hard way. We were in Washington DC a few years ago and would be gone for the day. At 8:00 when we left we had two cruise airs set and working. In the 95 degree days the coach was about 85 when we got back to it at about 5:00 when we returned.

Even with all 4 cruise airs turned on it was a couple of hours before the inside temps began to get comfortable. It was cooler inside than outside, but it was still hot. The only way to get down to where we wanted it was to run the OTR.

When we owners are asked about coaches by potential buyers we always encourage the making of a list of features that are "must have" features. Anytime OTR is brought into the discussion, owners of coaches tend to defend what they have. I suppose that is normal, but few owners of a OTR equipped coach would seek out one without it. Salesmen over the years have created some really well polished reasons why OTR is not needed, but when buying a Prevost a good rule to follow is that often "too much is just not enough."