Repair vs. replace
Compare a diagnosed repair with replacement quotes, age, refrigerant compatibility, comfort, and warranty. There is no single age or repair-cost rule that decides every system.
HVAC project planning
HVAC installation cost
Plan for replacing or installing a central heating and cooling system. The model scales with home size and the selected equipment type.
Planning estimate—not a contractor quote. The model is separate from the published national guide. A ZIP match applies a broad 2024 BEA state index—not ZIP-level contractor pricing.
Published national guide
Reference range—not local pricing
Angi · AC replacement cost guide· updated October 22, 2026- Low
- $3,887
- Angi-published average
- $5,978
- High
- $8,073
Source scope and model assumptions
Published guide scope
Central AC replacement only. This is a component reference, not a complete furnace-plus-AC installation.
Angi reports a 2026 average from 24,979 projects reported by Angi Pros. The figures are a published guide benchmark, not a HomeCostIQ local quote.
Unadjusted HomeCostIQ model baseline
- Low
- $6,500
- Typical
- $10,500
- High
- $17,200
Before supported project inputs or any applicable broad state-level proxy.
High. The national reference is cooling-only, while this model can represent a combined system. Capacity, duct condition, fuel conversion, equipment match, and local code can move the total materially.
Project estimator
Estimate your project
Adjust supported details and recalculate without leaving the page. Expand optional inputs only when they fit your project.
Estimate preview
Enter the required details to see a low-to-high model range, cost breakdown, and source coverage.
A ZIP match may apply a broad state-level index; it is not local contractor pricing.
Use the result to prepare questions and compare written, itemized proposals.
Cost factors and bid checklistOpen practical project considerations to review before comparing written proposals.
What influences the final price?
- System type and capacity
- Existing ductwork condition
- Electrical and venting updates
Source notes, regional context, and homeowner guidanceOpen published references, cost drivers, permits, maintenance, hiring questions, and option comparisons.
National AC replacement reference
Central AC replacement guide range—not a complete HVAC-system quote
Low guide value
$3,887
Angi-published average
$5,978
High guide value
$8,073
Scope: Central AC replacement only. This is a component reference, not a complete furnace-plus-AC installation.
Source basis: Angi reports a 2026 average from 24,979 projects reported by Angi Pros. The figures are a published guide benchmark, not a HomeCostIQ local quote.
Source page updated October 22, 2026. Angi is a third-party cost-guide publisher; HomeCostIQ has not independently audited the underlying project reports. The national guide is context, not a verified observation for your ZIP.
Your calculator models a broader heating-and-cooling scope. This published AC-only reference is shown for context and is not substituted for a complete HVAC system price.
HomeCostIQ model baseline: $6,500 low · $10,500 modeled typical · $17,200 high before size, material, scope, and state-index adjustments. This is a model input, not a national contractor-price observation.
Regional labor and materials context
A state index is not a local bid
The calculator may apply a broad BEA state price-parity factor to its modeled range. It is a general purchasing-power proxy, not project-specific labor or material pricing.
BLS occupational wage tables describe employee wages, not contractor bill rates, overhead, insurance, dispatch minimums, or project bids. Neither data source validates a ZIP-level quote. BEA RPP data · BLS OEWS tables.
Common configurations and timing
Scope, options, and schedule
A like-for-like central heating and cooling replacement using the existing distribution system. Home square footage is only a rough sizing input; a qualified load calculation is needed to select equipment.
Typical schedule
Often one to several workdays for a straightforward swap; duct, electrical, structural, or fuel changes extend the schedule. Confirm the contractor’s actual sequence and outage plan.
Specifications that move the price
- A room-by-room load calculation and correct equipment capacity
- Gas, heat-pump, or furnace-only configuration and efficiency tier
- Duct leakage, balancing, returns, controls, venting, and electrical capacity
- Seasonal demand, access, refrigerant handling, commissioning, and warranty terms
Permitting and regulation
Local requirements to verify
- Ask the local building department which permits and inspections apply to equipment replacement, fuel changes, electrical work, venting, or duct modifications.
- Have the contractor identify who files permits, coordinates inspections, and documents required startup or commissioning checks.
Rules vary by jurisdiction and project scope. Confirm requirements with the local building department or utility; this research is not legal or code advice.
Ongoing ownership cost
Maintenance and recurring expenses
Budget for filter changes and periodic professional maintenance. Compare projected energy use using your utility rate and the exact equipment efficiency; this calculator does not promise a payback.
Maintenance notes describe recurring tasks and cost drivers, not a standardized annual dollar estimate. Ongoing maintenance is not included in the one-time project range unless a page explicitly says otherwise; use product documentation, actual service quotes, and your usage to build a separate ownership budget.
Budget completeness
Common cost overruns and extras
- Load calculation and duct leakage testing
- The linked AC guide reports $3,000–$7,500 for ductwork changes; this is not a complete HVAC-system add-on quote.
- Old equipment recovery and disposal; the same guide reports $25–$200 for AC removal.
- Thermostat/control compatibility, air balancing, startup measurements, and labor warranty details
Avoid overspending
- Do not select capacity by square footage alone.
- Compare matched equipment model numbers and commissioning scope, not headline efficiency labels.
- Keep duct, electrical, and indoor-air-quality upgrades optional and itemized unless a measured need or code requirement supports them.
Hiring checklist
When to hire—and what to ask
Use a licensed and insured HVAC contractor for equipment selection, refrigerant work, gas or electrical connections, and commissioning. A second opinion is useful when a replacement is recommended without diagnostic evidence.
Questions for contractors
- Which load calculation supports this capacity and model?
- Are equipment, labor, permits, duct changes, disposal, and commissioning itemized?
- What measured startup results and written parts/labor warranties are included?
Warning signs to investigate
- A quote based only on floor area or the existing unit’s tonnage
- Pressure to choose a larger system without explaining the load calculation
- No model numbers, permit plan, commissioning checklist, or written scope
Compare the trade-offs
Repair, upgrade, or replace?
Budget vs. premium
Standard-efficiency equipment usually lowers initial cost; higher-efficiency heat pumps or matched systems may reduce energy use, but the savings depend on climate, utility rates, sizing, and controls.
DIY vs. professional
Safe preparation: clear access, note comfort issues, and replace user-serviceable filters. Leave refrigerant, gas, electrical, and equipment installation to qualified professionals.
Expected useful life
Equipment service life varies by system, climate, use, maintenance, and installation quality. Ask the technician to document condition and expected remaining life rather than relying on a fixed replacement age.
Learn before you hire
Related project guidance
Questions homeowners ask
Common questions
Does this estimate include new ductwork?+
No. The baseline assumes existing ductwork can be reused. New or extensively repaired ductwork can materially change a project total.
How do I compare HVAC quotes?+
Compare equipment model numbers, efficiency ratings, labor scope, warranty terms, permits, and commissioning—not just the headline price.
Is the national reference a complete HVAC-system price?+
No. The linked Angi benchmark is for central AC replacement. The calculator’s combined-system result is a separate modeled planning estimate and may include different equipment scope.
Does a high-efficiency system always save money?+
No. The result depends on climate, utility prices, run hours, system sizing, installation quality, incentives, and how long you keep the equipment.
Why can two HVAC quotes differ so much?+
They may assume different capacities, duct repairs, electrical work, controls, permit handling, commissioning, and warranty coverage. Compare the written scope line by line.