Evaluate HVAC: Repair or Replace?

The repair-or-replace decision is one of the most common questions homeowners face with aging HVAC equipment. There's no single right answer, but there are clear factors that should guide your decision.

Start with the age of the system. Most central air conditioners last 15–20 years, and most furnaces last 20–30 years with proper maintenance. If your system is approaching or past these thresholds, replacement often makes more financial sense than continued repairs.

Apply the 5,000 rule: multiply the age of the unit (in years) by the estimated repair cost. If the result exceeds $5,000, replacement is generally the better investment. For example, a 12-year-old unit facing a $500 repair scores 6,000 — lean toward replacement.

Consider efficiency. Systems manufactured before 2010 are significantly less efficient than modern units. A new 18-SEER air conditioner can cut cooling costs by 30–40% compared to an older 10-SEER unit. Over time, the energy savings can offset much of the replacement cost.

Frequency of repairs matters too. If you've called for service two or more times in the past year, the system is telling you something. Repeated breakdowns signal that multiple components are failing — and each repair is just delaying the inevitable.

When in doubt, ask for a second opinion. Heirloom Mechanical provides honest, no-pressure assessments. We'll give you the full picture — repair costs, replacement options, and projected energy savings — so you can make the decision that's right for your situation.