“There's a bit of a chill in here.”
It's winter. You're at work. The room is colder than normal. You say something about it to one of your coworkers.
There's a bit of a chill in here.
The phrase "a bit (adjective)" is similar in meaning to "a little":
It's a bit cold out.
The meaning of "a bit of a ___" is the same, but you use it before a noun instead of an adjective.
A ‘chill’ is a light touch of cold in the air. It’s just cold enough to want a sweater. ‘Chill’ can be used in both formal and informal speech.
There's always a chill in the kitchen. I wonder if we should replace the windows in there.
You can add “in” before “here” to emphasize that you are inside.
It’s hot in here!
Use “there’s ___” to talk about something existing:
A: There's a problem.
B: Oh no. What's wrong?
Often we explain where something is by saying "there's (something) (somewhere):
There’s a weird smell in my car.
There’s a woman in my neighborhood who keeps over a dozen cats at her house.