Hardy spent five years in Happy Valley.
Herron verbally committed to Penn State on December 11.
Thomas is the seventh player to commit to Penn State's recruiting Class of 2025.
Mercedes-Benz Stadium has a capacity of 71,000, but there will likely be more in the stadium on gameday.
From recruiting to hosting NHL games at Beaver Stadium, James Franklin and Pat Kraft took the stand to talk all things Penn State football.
"Every commit, when they commit to Penn State, I talk to them about committing to me and the university."