Fish bowl cooling class A

Obviously a bugaboo for motorized RVs, the larger they are the worse it is for driving in triple digit temps. All the ideas mentioned above can have some effect for some, more than likely not dramatic enough for most. We purchased our current class A in Texas and picked it up in late July enduring record temps that hovered around 115 degrees.

Previous owners replaced dash AC in hopes of making it more bearable, indeed air out of vents was really cold but the time it reached us in cockpit seats it simply did not do the trick. You can throw a bunch of money at it with minimal results, kind of like trying to get better mpg, best and most effective method is to just drive a bit slower.

We found if we just left a little bit earlier when temps soared by noon we were at least accustomed to it, thankfully my DW and I were born, raised, and lived most of our adult life in Phoenix and are able to tolerate heat somewhat. Hopefully you find a method that at least makes it more bearable, I know it would be helpful for so many with same issue.

How do you keep the water in the bowl on rough roads?!!!!

Roof ac units are the high capacity 15 amp and not too old. When parked they do a great job.

Yup been thinking about a portable ac unit as well. The ducting to a window might be a PITA.
Would love to hear from anyone who has done this.

Was also thinking of those units they hang over the door of businesses they put out a lot of air

Try a portable AC unit that is vented to the outside and directing air right in to the cockpit, in addition to your two roof top AC units.

We took a trip to southern Utah, temps 118° in Kanab - ugh. Running the Dash air and both roof top it was still warm. I had 2 fans blowing air from the back, helped a bit but still hot. When we parked and had our solar shade and curtains closed we could get the RV fairly cool, but not when traveling.

On another trip we did try hanging a thick shower curtain just behind the driver/passenger seats, dash air wasn't enough so we fired up the generator and had 2 of the air top vents pushing air up front and the dash. That helped but the dash just isn't powerful enough.

Reality is that it's just not well insulted enough and the front end with all that glass makes it worse. I suppose a stand alone might help, but we've just tried to avoid driving after 2PM in hot climates. I live in the desert so we've learned to adapt. What's the size of your roof top A/Cs?

Tried the Fan, not good enough.
Have 2 ac units on roof, they don’t cool the fish bowl when driving.

Sorry I can’t drive away from the sun or time trips for early morning or later evening.

Have cooled the fish bowl before start of trip and it stays cool for a while, then it gets hot.

Maybe I should install one of those residential attic fans in the ceiling?
Maybe not, would get me wet when it rains

I have to assume your 40’ motorhome has multiple rooftop AC’s or similar, as well as a generator sufficient to run all of them. Start the generators and turn on the AC units. If the dash AC has a recirculate option so turn that on too. As the cool air from the roof mounts get to the floor it should go up the return for the dash ac and help it cool better as well.

Where traffic conditions allow, we pull the side shades facing the sun down far enough to block the sun but not to interfere with viewing the mirrors. Do the same for the front shade down to help block out the sun.

Try and time your driving so you're not driving into the sun.
Let me guess, your coach has dark paint in the front? I've had 2 like that and repainted the current Foretravel with light colors and it makes a big difference. I use a Dewalt battery/120vac fan to more the air on me and keep the shades down as far as I can to keep solar gain off me.