&gt; They have a work around, but it requires re-wiring and you lose some functionality (do not recommend).<p>Are you talking about re-purposing the G wire to become the C wire? I had to do that just recently, and I lost the ability to cycle the fan on by itself (without calling for heat or cooling). Not a big loss in my opinion, but my system is dead simple.<p>The most infuriating thing about it is that the previous HVAC installer cut the fifth wire off instead of sparing it out.