From experience habitation air con will struggle to cool down an already hot van. You need to switch it on early in the day so it can keep a cool van cool. Also it helps to close all the windows blinds to prevent the suns heat from getting in.
a collection of top tips, tricks and ideas, DIY improvements and motorhome modifications that can also be made to caravans, campervans and RVs. Many of these modifications I have made and used on our own motorhome but I have also listed other tips, advice and product reviews that I have found on the Internet including ideas for day trips and visits.
Motorhome Mods UK 