What is a sentence of Chapter 7 of Bud, Not Buddy by Christopher Paul Curtis that has the sense of touch?

That's a great chapter.  It's the chapter where Bud goes into the library to find Miss Hill, and the reader learns Bud's rule about people saying "haven't you heard?"  

The chapter is also a feast for the senses, because Bud describes the library's looks, smells, and feel.  

The second sentence of the chapter provides a good sentence that highlights Bud's sense of touch.  

The air in the library isn't like the air...

That's a great chapter.  It's the chapter where Bud goes into the library to find Miss Hill, and the reader learns Bud's rule about people saying "haven't you heard?"  

The chapter is also a feast for the senses, because Bud describes the library's looks, smells, and feel.  

The second sentence of the chapter provides a good sentence that highlights Bud's sense of touch.  

The air in the library isn't like the air anywhere else, first it's always cooler than the air outside, it feels like you're walking into a cellar on a hot July day, even if you have to walk up a bunch of stairs to get into it.

Bud could have told his readers that the air conditioning was on, but he doesn't.  He describes what the air feels like on his skin, and he uses a familiar analogy to anybody that has ever been in a house with a basement.

I found it odd that the third story of a building could be so cool during that time in history, because I didn't think that air conditioning had been invented yet.  But it turns out that air conditioning was invented in 1902, so it is more than likely that the air was so cool because the building had air conditioning. 

The rest of the narration about the library focuses mainly on the smell of the library and all of its books.