There is no tie-breaking mechanism in the HoD. Just the Senate.
The Senate is 21-19, but there are three rural democrats who sometimes break with the party.
A 20-20 tie in the Senate is broken by the Lt. Gov.
The GOP will have 52-48 in the HoD, so there is no need to break a tie there.
What I mean is, hypothetically, if there is a 51R-49D HoD and a 21D-19R Senate, and Gov. Younkin appoints a Justice to fill a vacancy, what would happen if the joint session resulted in a 70-70 tie? I know that the Lt. Gov. Sears will be the President of the VA Senate and only will get to break ties there, not in the HoD, but woud she be able to break ties when the Senate is in a joint vote with the HoD? My gut tells me that the answer is “no,” but I want to make sure.