Expression: 'It feels nice.'

[Tom]

Hi

When we can say

[Mister Micawber]

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'When can we say?'-- tsk-tsk, Tom!

The window example is not very good, but some things can certainly 'feel bad'. 'Don't tickle me with that whisk broom-- it feels bad!'
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Native English teacher at Mister Micawber's

[Yankee]

Hi Tom

It is possible to say "it feels bad", but the way you've used it sounds odd.
You could say something such as this:
What you want me to do is legal, but it feels bad/wrong.

In your window examples, the first sentence suggests to me that 'it' = 'fresh air'.
In your second window sentence (with bad), I get no clear suggestion about what it is that feels bad, and it doesn't seem logical that "fresh air" might produce a bad feeling. So, instead of saying 'it feels so bad', I might say something such as one of these:

Close the window -- it's cold.

Close the window -- the heat and humidity are making me feel sick, so I'm going to turn the air-conditioning on.
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[Yankee]

[Mister Micawber]

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[Tom]

Many thanks, MM and Amy

Yes, I could not give good or complete examples.

Please see here. Are they OK now?

[Mister Micawber]

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You know, Tom, it still does not sound quite right to me. I think that for physical discomfort I would normally choose a more specific word ('it feels cold', etc) as Yankee said. 'Bad' seems to me to be more used of intangibles, as in Yankee's 'It's illegal...it feels bad' or 'I feel bad about losing my job' or of illness itself-- 'I ate a bag of Oreos and my stomach feels bad'.
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Native English teacher at Mister Micawber's