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Air Handler Replacement Cost Calculator

Air handlers (AHUs) are major capex items with 20–30 year lives — plan replacement.

AHU CFM

Equipment $/CFM

Rigging + crane

Ductwork tie-in

Electrical + controls

Contingency %

Total project cost

$395,360

Equipment cost

$240,000

Installation cost

$113,000

How the math works

Equipment = CFM × $/CFM. Total = (equipment + install) × (1 + contingency).

20,000 × $12 = $240k + $113k = $353k × 1.12 = $395.4k.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Air Handler Replacement Cost Calculator is built to give a quick, browser-based estimate for air handler replacement cost. Air handlers (AHUs) are major capex items with 20–30 year lives — plan replacement. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

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How to interpret the air handler replacement cost result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this air handler replacement cost estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter AHU CFM size.
Enter equipment $/CFM.
Enter rigging + crane cost.
Enter ductwork tie-in cost.
Enter electrical + controls.
Enter contingency %.
Read total project cost.

Frequently Asked Questions

AHU cost drivers?

Equipment $5-25/CFM depending on configuration. Variable air volume (VAV) more expensive than constant volume. Premium efficiency motors + ECM: +10-25%. Energy recovery wheel: +$2-8/CFM. Stainless steel construction: +20-40%. Custom built-up units: +30-80% vs packaged. Modular replacement allows phased replacement of large AHUs.

Installation cost?

Mechanical installation: 60-100% of equipment cost. Crane + rigging (high-rise rooftop): $25-150k per unit. Ductwork modifications: $5-30k. Electrical (480V 3-phase): $5-25k. Controls integration with existing BMS: $10-40k. Demolition + disposal of old unit: $10-30k. Typical total install: $50-300k for mid-size AHU.

Replacement timing?

Lifespan 20-30 years typical. Replacement triggered by: refrigerant phase-out (R22 → R454B), fan motor failure cycles, coil replacement at year 15-20, casing corrosion, parts unavailability after 25 years. Major reason: efficiency gains (modern unit 25-40% better SEER/IEER). Tax-advantaged refresh schedule recommended.

Phased vs full replacement?

Single AHU replacement: $50-300k typical. Building-wide AHU replacement (multi-unit, large building): $1-15M+ typical. Phasing: replace in 3-5 year program rather than all at once. Funded via reserves + capital plan. Avoid: replacing at end-of-life when failure has occurred (emergency premium 20-50%).