Ok well as I said with a Furnace only... That el-cheapo mechnical MERCURY FREE T-stat.. is the actually what I recommend.
My rig originally the front Carrier A/C also controlled the T-Stat but we replaced with a COLEMAN (Like much better) it id not have the relay to fire the furnace so I added the ACE T-Stat with an in-line switch and an LED indicator (Not needed) The inline switch turns off the furnace for "Storage" mode or any other time it's not needed.. The LED was just let me know the switch was ON. it's not needed at all.
