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Clearly you need response from others who are located in similar areas; Arizona, New Mexico etc. If you get a lot of sun, you may need to keep your sunroof or a window open a crack to help release some heat. Do you have a black roof? If so the car will be hotter. This is a very well sealed car, one reason why the windows automatically open slightly when you close the doors.

On the very hot days we get in my area (summer temps can hit 90+ F) the air con seems to work very well in my experience. So I supect ther may be a malfunction. Do you have an auto temp control system or a manual one?

Minis do run hot, but they are well shielded between the cabin and the engine compartment so it is unlikely that engine heat is the culprit. Of course the way to test that is to take the interior temp after the engine has cooled down.

Hope that you get response from others in your area and that you get some answers.
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Thank you Jeremy for your input. My MINI stays in the garage most of the time. It is parked outside only when I am using it. When I start driving it, usually, the inside temperature is the same as the one outside, but as soon as I have driven it for more than 1 hour it heats up quickly. The heat comes from below in my feet. Can you add anything else to your comment?

Take it back to the dealer or another dealer. It sounds to me that shielding on the exhaust system may be out of place or failing. There is no reason for this kind of heat at your feet. This is not something I've noticed with the car. Ask if a mechanic can look at the minute you bring it in and then do a hour long drive prior to the appointment so that the problem is very evident.

Good luck!
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