There’s no faithless electors in an election decided by the House. Each state gets one vote and whomever gets the most state delegations wins. Read the Constitution.
You are misunderstanding me. I mean a faithless elector can prevent the election from going to the House at all. If one of Trump’s or Biden’s 269 electors votes for the other guy, then the election will be decided in the electoral college and that’s it.
Now, the Supreme Court settled a long unsettled question this year and held that state faithless elector laws are enforceable. But only 14 states actually have laws invalidating the faithless elector’s vote.
Also, in the House, it isn’t whoever gets the most states, it’s whoever gets a majority. That could be an important distinction: If our faithless Trump or Biden’s elector votes for a Hillary or David French or some other third party, then all three would be candidates in the House, and the House would keep voting until one wins 26 states.