You say "Ese hombre está muy guapo". You would say that if the guy is only hot temporarily. If you mean the guy is intrinsically hot, it would be "Ese hombre es muy guapo." You could use the word "tipo" for "guy".
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It depends on what you mean. If you mean it is a warm day and I am feeling the heat, "Tengo mucho calor". If you mean "I am a very attractive person", you could use "Soy muy caliente".
For "You are very hot and thirsty", you would use "tiene mucho calor y tiene sed."
For "I am very hot and thirsty", it is "Tengo mucho calor y tengo sed".