SoundGuy wrote:
DiskDoctr wrote:
Get the hottest air out first, provide cooler air to the A/C to further cool, and reduce any inside pressure by allowing a good exhaust while you replace that air with ever cooler air.
Not sure of the mystery here :h - this is exactly the same approach with any vehicles I've ever owned. Hot summer day, vehicle has been sitting cooking in the sun, first thing I do after starting is roll down all the windows, fire up the A/C, and allow it to force hot air out before replacing it with cold air. Much more efficient than leaving all that hot air trapped in the vehicle and trying to slowly replace it with cold air. We don't use A/C in the camper often but when we do it's exactly the same procedure. :)
I agree. It’s not a mystery that you would crack a window in a hot car. However, typically after it cools down you close it and all is good. The mystery here is that two AC units in my 43ft toyhauler could only bring temps down to 92f give or take. This was after running all day. Opening a vent and cracking a window dropped that by around 5f in a very short period of time. So this isn’t about initial cooldown as much as it is about improving AC efficiency through out warmer periods. Leaving a window open all day is counter intuitive. But if your AC units are struggling to keep temps down, leaving a window cracked or a vent open and running may help bring those temps down further than keeping everything closed. I did not expect that and know many others in the SW are in similar situations. Let’s not even bring up refrigerators :)
