My existing 4-wire thermostat cable comes out of the furnace, and each of the wires is wire-nutted to another wire. That then goes to the thermostat.
I'm going to pull new cable to support a smart thermostat. Should I keep the splices, or should I run one continuous cable from the furnace all the way to the thermostat? If I should leave splices, should I put them all into a box?
The furnace was replaced a couple years ago, and I'm unsure if the splices were a result of that or a result of updated codes or best practices.