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How much does a furnace replacement cost in Key Largo, FL?

US national rangeUpdated Prices checked October 20261 source

A furnace replacement costs $2,823 to $6,896 nationally, typical $4,814. We have no documented price index for Key Largo for this job, so this is the US national range from HomeAdvisor, checked October 2026.

US national range, not adjusted for this city

Low
$2,823
Typical
$4,814
High
$6,896

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Furnace replacement cost in Key Largo, FL

We have no documented price index for Key Largo for this job, so the table shows the US national range.

Furnace replacement cost in Key Largo, FL
EstimateLowTypicalHighBasisChecked
US national range$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs (HomeAdvisor)October 2026

Furnace replacement cost by type or size

US national figures in USD, as published by each source.

Furnace replacement cost by type or size
Type or sizePrice (USD)Source
Electric furnace$2,000 to $7,000HomeAdvisor
Gas furnace$3,800 to $10,000HomeAdvisor
Oil furnace$6,750 to $10,000HomeAdvisor

What drives the cost of a furnace replacement

  1. Fuel type

    Electric furnaces cost least to install; oil costs the most.

  2. Efficiency rating

    High-AFUE furnaces cost more up front.

  3. Home size

    Furnaces are sized at roughly 30 to 60 BTUs per square foot.

  4. Climate

    Colder regions need more capacity.

  5. Removal of the old unit

    Removal and disposal typically add $150 to $330.

Permits and what's included in Key Largo

Permit note

Furnace replacement usually needs a mechanical permit, and gas work may need its own. Ask your local building department for the fee.

Rules are set locally; confirm with Key Largo’s building department.

What’s usually included

  • The new furnace
  • Connection to existing ducts, venting and fuel supply
  • Startup and testing

Scopes vary. Get the scope in writing on every quote.

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Top-ranked HVAC contractors in Key Largo

The top 3 of 16 HVAC contractors we rank for Key Largo, FL, by CR Score. Paid placement never changes rank.

  1. #1
    SUB ZERO AIR
    CR Score 945.0from 177 Google reviews
  2. #2
    Irwin's Air
    CR Score 925.0from 412 Google reviews
  3. #3
    Air Conditioning On Call
    CR Score 914.9from 54 Google reviews

See all ranked HVAC contractors in Key Largo

How to check an HVAC contractor's license in Florida

In Florida, Florida Construction Industry Licensing Board (DBPR) licenses Certified or registered air conditioning (CAC, RA) and mechanical (CMC, RM) contractors.

  1. Search the business name or license number on the Florida Construction Industry Licensing Board (DBPR) license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. Ask for proof of insurance before work starts.

No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.

Guide checked October 2026. How we verify licenses

Furnace replacement cost in Key Largo: questions

How much does a furnace replacement cost in Key Largo, FL?

A furnace replacement costs $2,823 to $6,896 nationally, typical $4,814. We have no documented price index for Key Largo for this job, so this is the US national range from HomeAdvisor, checked October 2026.

Do I need a permit for a furnace replacement in Key Largo?

Furnace replacement usually needs a mechanical permit, and gas work may need its own. Ask your local building department for the fee. Rules are set locally, so confirm with Key Largo’s building department.

What affects the cost of a furnace replacement?

Fuel type: electric furnaces cost least to install; oil costs the most. Efficiency rating: high-AFUE furnaces cost more up front. Home size: furnaces are sized at roughly 30 to 60 BTUs per square foot. Climate: colder regions need more capacity.

How many HVAC contractors serve Key Largo?

We rank 16 HVAC contractors for Key Largo, FL by CR Score. Get at least three written quotes for the same scope.

What is usually included in the price?

The new furnace; Connection to existing ducts, venting and fuel supply; Startup and testing. Always get the scope in writing on the quote.

Sources

Checked October 2026. Figures are estimates, not quotes.

  1. HomeAdvisor: Furnace replacement cost · page updated June 17, 2026 · checked October 2026Primary source. Used for: Low, typical and high; prices by fuel; drivers.
These are published estimates, checked October 2026. They are not quotes. Typical range shown: $2,823 to $6,896. Editorial policy

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