HVAC Lifecycle Replacement Calculator

HVAC has lifecycle. This calculator plans replacement.

Unit count

Avg unit age (years)

Useful life years

Per-unit replacement cost

Total replacement cost

$1,170,000

Years until replace

Annual reserve per unit

$433

How the math works

Years until = useful life − age. Total = units × cost. Annual reserve per unit = cost / life.

180 units × $6,500 = $1.17M total. 7 years until avg replacement. $433/unit annual reserve. Start reserving early; bulk contracts reduce cost 15-25% vs emergency service calls.

How to Use

Enter unit count.
Enter avg unit age.
Enter useful life years.
Enter per-unit replacement cost.
Read replacement timing and cost.

Frequently Asked Questions

Useful lives?

Residential split system: 15-18 years. Package unit: 12-15 years. Commercial RTU: 15-20 years. Ductless mini-split: 12-15 years. Chiller: 20-30 years. Boiler: 20-40 years. Heat pump: 10-15 years. Coastal environments reduce 20-30%.

Replace vs repair?

Repair cost > 50% of replacement: lean replace. Efficiency improvement (SEER): energy savings tip balance. Age 75%+ of useful life: preemptive replacement often economical. Major component failure (compressor): near-total replacement trigger.

Batch strategy?

Replace units in batches (e.g., 20 units per year over 10 years) vs waiting for failure. Bulk pricing discounts. Planned vs emergency. Smoother cash flow. Emergency replacements 40-60% more expensive than planned.

How often should I rerun this?

Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.