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Learn about Muy and Mucho in Spanish
In Spanish, just as in English, we use different words to add intensity (very) or express large quantities (a lot of, much, many) = muy and mucho.
Have a look at the distinction between muy and mucho.
Muy [adjective] / [adverb] = very [adjective] / [adverb]
Muy never changes and you can never use it on its own.
Mucho = a lot / much
Note that to express [to do something] a lot / much, you use [verb] mucho.
Mucho + [masculine singular noun] = a lot of / much [masculine singular noun]
Note that to express a lot of / many / much, you use mucho + [masculine singular noun].
In the case of mucho as an adjective, it will change depending on the gender and number of the noun it refers to = mucho, mucha, muchos, muchas.
See Using demasiado, bastante, suficiente, poco, tanto and mucho to express quantity in Spanish (quantitative adjectives)
Case of Hace mucho calor/frío (It is very hot/cold)
Why not muy here? Simply because the words calor and frío are not adjectives in Spanish, but nouns! Literally, you say It does much heat/coolness. Therefore, you need to use mucho and not muy!
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Examples and resources
Put a lot of chocolate in the dessert.
