Like Texasbrit said, the existing recordings should play just fine as long as you hook your DVR up to a satellite at your new home, and turn your DirecTV service back on (if it was temporarily turned off).
However, I believe you have to set up all of your series links for the new networks. For example if you have a series link for The Big Bang Theory on your old CBS affiliate, you will need to delete that series link and set up a new one for your new CBS affiliate. I'm fairly certain the DVR doesn't automatically do that for you. This should only effect series links for your local affiliates though, any series links for national cable channels like USA, FX, TBS, etc should continue to work just fine.