What little I know - recruitment is in January, but the entire first semester is devoted to getting to know freshmen. It is not too early to send a rec! This helps the chapter know who's interested in recruitment.
No houses. Last I heard, no chapter rooms, nada. Somebody's apartment (on campus, everybody lives on campus...I think maybe only seniors can live off?) becomes know as the hangout where the current composite is hung.
Now...my knowledge is about 10 years old

...hope somebody can give an updated version!