If you have access to 240 volt power at some stage including a generator, you could buy a portable air conditioner, but you would have to be careful, about kilowatt size, so a gennie would run it. Alternatively - 12 volt fans, put them throughout the van and driving compartment, other than that I don't have any other options for you.
-- Edited by Bicyclecamper on Thursday 7th of November 2019 03:20:29 PM
If you have access to 240 volt power at some stage including a generator, you could buy a portable air conditioner, but you would have to be careful, about kilowatt size, so a gennie would run it. Alternatively - 12 volt fans, put them throughout the van and driving compartment, other than that I don't have any other options for you.
-- Edited by Bicyclecamper on Thursday 7th of November 2019 03:20:29 PM
You could also try hanging damp towels and blowing air through them with fans. In the days gone by travellers hung canvass water bags on the front of vehicles to keep drinking water cool but of course not cold.
My first lap was in a caravan with no air con, and stopping at the free/low cost/donation camp sites
By asking and listening to others at free camps, the following seemed to be the consensus
If you have no roof solar, try to park under some shade
Consider portable, instead of roof solar, or have both
Consider an awning, or the roof of an annex, for some shade
Wear lightweight breezy clothes
In daylight hours, under the hot sun, live outdoors in the shade, instead of inside the caravan/motorhome
Consider fly wire, and leave the windows open when parked up
Drink plenty of water
As others have said, you can use 12 volt fans, the cheap ones are noisy, and the expensive ones are not so noisy, but should last longer
If I had known then, what I know now, (I did not know about this website) I would never had gone across the top of Australia, in March/April, it was just too hot
Hope that there are many happy road trips ahead of you