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Buying Guide

Repair or Replace? How to Know When Your AC Is Done

The $5,000 question every homeowner faces. Here's the simple math we use to give honest answers.

SC HVAC Service Team April 18, 2026 5 min read

A new HVAC system is a major investment, but pouring money into an old, inefficient one is often worse. Here's how to decide.

The $5,000 rule

Multiply your unit's age by the repair cost. If the number is over $5,000, replacement is usually the smarter choice.

Example: a 12-year-old unit with a $500 repair = $6,000. Time to replace.

Other signs it's time

System is 15+ years old.

Uses R-22 refrigerant (banned and very expensive).

Energy bills keep climbing month over month.

Frequent breakdowns — more than once a season.

Uneven cooling or constant short cycling.

What you gain by upgrading

Modern systems are 30–50% more efficient. Two-stage compressors and variable-speed blowers mean quieter operation, better humidity control, and more even temperatures. Many qualify for utility rebates or tax credits.

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