I haven’t looked up the current numbers but GOP Representatives outnumber Democrat Representatives in about 35 states.
Something like seven states have only one House member,so that rep gets to make his own decision.
Swing state Florida’s US House delegation is dominated by Republicans, 17-10. Ohio by 11-4. Pennsylvania by 13-5.
So based on one state one vote in the US house of Representative in the event no candidate get 270 electoral votes, a Hillary (or Bernie) vs Cruz (or Kasich) vs Trump as independant, the GOP would win.