Furnace Repair in Key Largo
Get fast, fair pricing from licensed local pros. Typical Key Largo cost: $70 – $225 installed.
- Flame sensor
- $70 – $225
- Igniter
- $125 – $400
- Blower motor
- $350 – $1.3k
- Control board
- $250 – $700
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Furnace repair cost by part.
Typical Key Largo repair pricing including parts and labor. A diagnostic fee usually applies and is often credited toward the work.
In Key Largo, furnace repair costs are influenced by the area's hot-humid climate and reliance on heat pumps rather than traditional furnaces. Most homes (median built 1985) use heat pumps for heating, so furnace repair here typically refers to heat pump system repairs. Diagnostic fees range from $65 to $175, and common repairs like flame sensor ($70–$225) or blower motor ($350–$1,300) reflect local labor rates. Florida law requires a mechanical permit for any repair involving refrigerant or major components, and the Florida Building Code mandates hurricane tie-downs for outdoor units. The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump) applies to eligible repairs or replacements.
- Diagnostic / service callOften credited toward the repair$65 – $175
- Flame sensor or thermocoupleCommon no-heat cause on gas units$70 – $225
- Hot-surface igniterFurnace clicks but won’t light$125 – $400
- Blower motorNo airflow / weak airflow$350 – $1,300
- Heat exchangerCracked exchanger often means replace$1,300 – $3,000+
* A cracked heat exchanger is a safety issue — on an older furnace, replacement is usually the call.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in Key Largo
U.S. Census ACS- Households
- 4,808
- Homeowners
- 3,778
- 44% own
- Median home value
- $595,500
- Median income
- $74,239
- Median home built
- 1985
- Housing units
- 8,581
With a median home built in 1985, many Key Largo AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about Key Largo.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for Key Largo
Given Florida’s hot-humid climate and heat-pump heating, high-seer2 heat pump is the sensible default for most Key Largo homes. With a long, hard cooling season here, stepping up the SEER2 tier pays back through lower summer bills. A pro can confirm the right size and system for your home with a load calculation.
Sources: Duke Energy Florida HVAC Replacement Rebate · SEER2 Southeast Region Standards · EIA Florida State Energy Profile
What Key Largo code requires
Installing or replacing an HVAC system in Key Largo follows Florida rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum14.3 SEER2 (Southeast, <45k BTU)
Federal Southeast-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRequired (Manual J)
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
Florida Building Code requires hurricane/high-wind tie-downs and anchoring for outdoor condenser/heat-pump units.
Sources: Duke Energy Florida HVAC Replacement Rebate · SEER2 Southeast Region Standards · EIA Florida State Energy Profile
Not sure which rules and rebates apply to your home?
A licensed Key Largo pro will walk you through code, the right unit, and what you can claim back — in one quick call.
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Money back in Key Largo
Florida heating is mostly heat-pump, which shapes the money back:
- StateUp to $1,000 (heat pump/strip-heat upgrade; $300 AC, $500 heat-pump upgrade)Duke Energy Florida HVAC Replacement Rebate →
State or utility program — verify eligibility before you buy.
- State$200 instant credit (SEER2 15.3+ via participating contractor)FPL High-Efficiency AC/Heat Pump Instant Rebate →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state.
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- 1
Tell us what’s wrong
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- 2
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- 3
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Furnace Repair in Key Largo, explained.
What affects repair costs in Key Largo
Prices vary by the specific component needing repair—flame sensors and igniters are less expensive, while blower motors and control boards cost more. The age of your system (median home built 1985) may mean older parts are harder to find, increasing labor time. Permits add $50–$150 to the total. Because cooling demand is high, many repairs involve heat pump components, which can be pricier than a standalone furnace. Hurricane tie-down requirements for outdoor units may add cost if the unit needs resecuring.
Common furnace (heat pump) repairs in Key Largo
Flame sensor failure
A dirty or faulty flame sensor can cause the system to shut off after ignition. Cleaning or replacement costs $70–$225.
Blower motor issues
The blower motor circulates air; failure leads to no heat or poor airflow. Repair costs $350–$1,300.
Control board malfunction
The control board manages system operations. A faulty board can cause intermittent or no heating, costing $250–$700 to replace.
Furnace Repair FAQs — Key Largo
Yes, Florida law requires a mechanical permit for any repair involving refrigerant or major component replacement. Your contractor should pull the permit; costs typically add $50–$150.
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