Really appreciate the time taken in your post and a few interesting points. As you say there is a fair bit about - which doesn't seem to e moving very quickly - perhaps another story! I felt the zircon would only really be useful with the windows in and the roof up - but it seems it's better than that! Thanks once again will report back Dave
Running air-con with roof down may feel nice to some degree (note, fan on full, nozzles directed towards you, etc) but it is working really hard. The compressor never gets to cycle on and off, the air filters are filtering much more air than normal and so will clog up quicker and of course, as mentioned, fuel consumption will dive.
On a hot day at home, would you open the freezer door and spend a couple of hours sitting in front of it to cool down?
In extremely hot weather, I find it more effective to pop the hood up with windows removed. Less chance of sunburn too.
