Major Costly Components

AC Compressor: Often called the “heart” of the system, it circulates refrigerant under high pressure.

• Estimated Cost: $1,500 – $3,500+.
• Reason for High Cost: It is a complex, sealed unit requiring specialized tools, licensed refrigerant handling, and extensive labor.

Furnace Heat Exchanger: This component transfers heat from combustion to your home’s air while keeping dangerous gases contained.

• Estimated Cost: $1,000 – $3,500.
• Reason for High Cost: Replacing it requires dismantling most of the furnace. Cracks are a major safety hazard (carbon monoxide leaks), often making a full furnace replacement the safer choice.

Evaporator and Condenser Coils: These coils facilitate heat exchange indoors (evaporator) and outdoors (condenser).

• Estimated Cost: $600 – $4,000+ (depending on unit size and whether the air handler is also replaced).
• Reason for High Cost: Coils are difficult to repair; leaks often require full part replacement, including vacuuming and recharging the entire refrigerant system. 

Blower Motor: The motor responsible for pushing air through your vents.

• Estimated Cost: $500 – $2,000 (especially for complex variable-speed models).

Refrigerant Leak Repair: Fixing leaks and recharging the system.

• Estimated Cost: $200 – $1,500+.
• Factor: Older systems using phased-out R-22 refrigerant are significantly more expensive to recharge due to limited supply.

Main Control Board: The “brain” that regulates system functions.

• Estimated Cost: $150 – $1,200.

Ductwork Repair or Replacement: Fixing leaks or installing new runs.

• Estimated Cost: $500 – $4,500+ (depending on accessibility and extent).