HVAC Systems: Repair, Replace, or Upgrade?

HVAC decisions significantly impact both renovation budgets and buyer appeal.

HVAC systems are one of the most expensive components in any home, and the repair-vs-replace decision on a flip property can swing your budget by $5,000-15,000.

Age-based guidelines: Systems under 10 years with maintenance records can usually be serviced and sold with remaining useful life. Systems 10-15 years old are case-by-case — a $500 repair might buy a few more years, or a $300 diagnostic might reveal a $3,000 compressor failure is imminent. Systems over 15 years should almost always be replaced.

Replacement costs: Central AC replacement runs $3,500-7,500. Furnace replacement is $2,500-6,000. Full system (AC + furnace) is $5,000-12,000 depending on efficiency rating and home size.

The upgrade opportunity: In some markets, a high-efficiency system (16+ SEER2) can be a selling feature worth the incremental cost. In energy-conscious markets or areas with extreme temperatures, buyers notice HVAC efficiency.

Ductwork: Don't neglect the distribution system. Leaky or undersized ductwork can reduce system efficiency by 20-30%. Duct sealing costs $300-500 and is almost always worth it.

Thermostat upgrade: A smart thermostat ($200-300) is a visible upgrade that signals a modern, well-maintained system.