I assume we are talking about the Federal House of Representatives. The House delegation of each state delegation are polled. If it’s majority GOP and party discipline is maintained that state becomes one Trump vote in the House. A simple majority elects the President. So if it’s 27 GOP & 21 Rats Trump wins. The Senate picks the VP, this where it could end up odd. The Senate picks the VP via a simple majority of all the Senators. If its the new Senate depending on how Georgia comes out we could end up with Kamala ad VP !
The job of the Vice President is to inquire daily into the health of the President.