I'll try some links--not so good at this:
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28438392.cfm
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28497063.cfm
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28422785.cfm
Remember when upgrading tstats--household tstats are 24 v ac while RVs are 12 v dc. I'm so fed up with the Dometic digital system, that I'm about to rewire the whole thing to household tstat with the relays necessary to control things. However, that is not just plug and play.