Here are some general ballpark prices for a few of the most common HVAC parts that homeowners need to replace:
Capacitor – $400 to $550
Compressor – depends on the warranty of the unit
Thermostat – $350 to $2000
Thermal expansion valve – $1200 to $3000
Heat exchanger – depends on warranty but ranges between $1700 to $2500
Contactor – $300 to $550
Fan – $800 to $2000