You need to start your sentence with:
One thing I don't understand is....
So -
One thing I don't understand is: When I enter the supermarket I am immediately hit by a blast of hot air but when I walk around to shop I almost freeze to death!
One thing I don't understand is....
So -
One thing I don't understand is: When I enter the supermarket I am immediately hit by a blast of hot air but when I walk around to shop I almost freeze to death!
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