Nice work on the furnace control, just for those still not disillusioned with LEDs have a look at http://www.onsemi.com/pub_link/Colla...I45020JZ-D.PDF http://www.onsemi.com/pub_link/Colla...SI45030A-D.PDF and there are versions of this with different current and voltages
I'm still trying to work out how to use a illuminated led as a switch if any one has done this let me know