What to Look for When Considering a Used Furnace

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Consider the furnace shown in Fig. P7-3, which is

Used AC Depot Refurbished, Certified Furnace CARRIER 58STA09013114 ACC-18001

When should you repair or replace your furnace?

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Can left over wiring (coming out of hole where old thermostat used to be) explain why 24 volts aren't reaching the compressor?

Used Cress Electric Furnace C122012DWH-PM4 For Sale — Liberty

Used AC Depot Refurbished, Certified Furnace CARRIER 58CVA09010116 ACC-8815

Furnace Installation Process From Start to Finish