Neither sentence sounds good or natural, and I am not sure what you mean. You seem to mean simply ' very hot' . Please explain more or give us a sentence in which you wish to use it.
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SupercatWe say the amount of energy, the amount of radiation, so I wonder if we can say the amount of heat as well.No, not there. You could try 'intensity of heat', but nothing is better than 'It's very hot today'.
Supercat I want to say it as: The majority of the amount of heat. But what would you say?Most of the heat
SupercatAre both much of the heat and most of the heat roughly okay?In what sentence? Context is critical.