It's rather cold in here

[Tara2]

Is "in" needed?

"It's rather cold in here"

 

[teechar]

No. You can omit it.

 

[Tara2]

No. You can omit it.

Thank you.
Always can "in here" be used instead of "here" and vice versa?

 

[Tarheel]

As always, context makes all the difference.

Bob: It's cold here.
Rob: Why don't you turn the heat on?
Rob: I don't mean inside. It's cold here in Bismarck, North Dakota. And it will take me a while to get used to it.
Bob: How long will it take you?
Rob: About three months.
Bob: Winter is almost over by then, isn't it?
Rob: Not here.