Larry,
Both systems are acceptable and shouldn’t significantly impact your decision on any coach choice. I was quite specific when buying and thought I had a strong preference for Cruise Airs (which I still do), but I would also consider a coach with roof airs, especially a Marathon since they have a unique setup.
Just to clarify, I’m referring to the XL series Prevosts; I don’t have experience with the H3’s or XLII’s.
What I appreciate about Cruise Airs is that they operate more quietly because the compressor is located underneath the coach, reducing noise overhead, although there is still some fan noise. I’ve only seen Cruise Airs controlled by SMX panels, which offer advantages like a digital readout for both current and set temperatures, the ability to automatically switch between heating and cooling—which can be quite useful in desert conditions—and five fan speed options, which lead to less noise once the desired temperature is reached. They are usually set up with three zones for a 40-footer and four for a 45-footer, while many roof airs tend to have fewer control panels.
On the downside, Cruise Airs do take up extra bay space compared to roof airs, which could have allowed for additional storage or even an entertainment center. This is less of a concern with 45-footers but definitely an issue for my 40-footer. They can also overheat and cycle on and off if parked on very hot blacktop with the coach low to the ground. I experienced this in Las Vegas, and it was frustrating because it took until the next morning for them to return to normal operation. I had to spray them with water to cool them down and raise the bus. This issue has only happened when parked low on extremely hot surfaces.
As for roof airs, they save basement storage space since Cruise Airs occupy some of the space behind the bumper and mid-ship. Roof airs are easier to access for servicing, and it should be simpler to find someone to work on them since they are more common, though I don’t have personal experience with this as my coach has Cruise Airs.
Marathon is unique in pairing roof airs with SMX controls, which give you five fan levels and automatic switching between heating and cooling, along with digital displays. The main drawback is a bit more noise compared to a Cruise Air-equipped coach. I’ve heard some people say the hum of their roof airs helps them sleep, but I find that any noise makes it harder for me to rest.
In summary, both systems have their compromises, and if I were to buy a coach with roof airs, I would prefer a Marathon for the reasons mentioned. That doesn’t mean I would ignore other options; I’d just prefer Marathon’s setup.
Keep in mind that these comments apply to my vintage of coach, which is a Series 60 XL. Newer coaches may have different configurations.
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