Do the temp hit points from the spell Heroism stack?

@GregoryFesto @ChrisPerkinsDnD @Gregtitodo the temp hit points from the spell Heroism stack? It says “each round”, so I’m thinking yes. temp hit points never stack – use highest value #WOTCstaff

— (((Mike Mearls))) (@mikemearls) December 20, 2016

@GregoryFesto @ChrisPerkinsDnD @Gregtitoso it’s like a minor regeneration with temp HP? Get temp HP, take damage, get more temp HP, etc? correct!

— (((Mike Mearls))) (@mikemearls) December 20, 2016