Great Discussion but I failed to convey that the switch I was talking about has a 20 amp fuse with it in the same box. It is metal, has the switch and a small metal cover next to the switch that covers the fuse.
Would this be overkill? New house with 12-2 to the furnace and a 20amp breaker at the sub-panel.
Currently have just a regular light switch next to the furnace.
Yes it would be overkill. just install a switch within sight of the unit and call it a day.