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Hypothetical Cooling Question. OTR vs Roof
Assuming you have OTR and are not connected to shore power, if your bus has been standing for a few hours or so without the AC on for whatever reason and you what it to get cool quick. Do you a) use the regular roof AC units via the genny, or, b) start the engine and use Prevost AC?
The reason I ask is that I have read (on PC of course) about the power of Prevost OTR and the speed in which it can cool down a bus from x degrees in y minutes, that it may be a more efficient option than the roof units, especially if you aren’t hooked up to 50A and therefore will need genny power.
Or am I missing something?
Not urgent obviously, just inquisitive.
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1 Reply
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It is all about the numbers.
If I have a hot coach and I want it cooled down quickly, regardless of whether I am on shore power or not I will start the engine and run the OTR. The output of the OTR, depending on the vintage coach ranges from somewhere over 80,000 BTU to over 100,000 BTU on newer models.
I can add to that cooling by either running my house AC units on generator or shore power. Regardless of whether the house AC units are roof air or Cruiseair their output is going to be 13,000 to 15,000 per unit so obviously the OTR is going to be doing the bulk of the cooling.
Once the house temps are where they need to be, and that includes cooling the surfaces of everything that got hot, such as counter tops, cabinets, etc. then in almost any coach 2 or maybe 3 house AC units will maintain the temps.
With limited output on house AC units compared to OTR it is best to never let the coach get heat soaked because if you do not have OTR it will take a long time, even with up to 4 units working to cool a coach. My definition of cool is the outside of the windows are sweating. Not everyone agrees with what I consider comfortable temps.
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