Trane replacement parts range from $8.50 to $1,775, depending on the model, the type of part and the vendor. The least expensive part is a replacement control knob, which sells for $8.50, as of 2015.
A condenser coil sells for $1,775. Condenser fan motors cost much less, and their prices range from about $168 to nearly $300. Contactors cost about $29, ambient air temperature sensors start at $22, and control boards cost anywhere from about $88 to more than $400. Time-delay relays cost $50, and ignitor kits cost about $142. Replacement heater elements cost about $560, and blower motors cost between $200 and $800.