Serving Jacksonville & Areas Up to 30 Mins Out · 24/7 Emergencies
Jax HVAC Co
HVAC Service · Jacksonville, FL

Heating Repair & System Service

Reliable heat pump and furnace repairs for cold winter nights. Locally owned and operated, servicing central AC, heat pumps, and furnace systems across Northeast Florida.

Service Details

Ideal For: Homeowners needing heat pump reversing valve or furnace ignition repair

Response Time: Same-day service available

Pricing Concept: Flat-rate diagnostic with upfront quotes

Certifications: EPA-certified, NATE-trained

Home/Services/Heating Service
Overview

Reliable, Professional HVAC Execution

While cooling is our primary focus, a reliable heating system is essential for cold winter mornings. We service electric heat pumps, gas furnaces, and hybrid systems. Our heating tune-up and repair checklist focuses on electric heat strip functionality, heat exchanger integrity (to prevent carbon monoxide leaks), and gas burner cleaning. We ensure your system transitions from cooling to heating safely and efficiently.

Our partnered contractors employ EPA-licensed and NATE-certified technicians. Partnered service vehicles are fully stocked with universal parts to ensure that we resolve your heating and cooling failures on the first visit, protecting your household comfort and peace of mind.

What is Included

  • Heat pump reversing valve and auxiliary heat strip repair
  • Gas furnace burner and ignition assembly cleaning
  • Carbon monoxide safety checks on gas systems
  • Thermostat heat-call troubleshooting
  • Durable replacement parts with manufacturer warranties
  • Electric heater core inspections
  • Flue pipe check and safety diagnostics
NATE certified technicians performing Heating Repair & System Service
Technical Execution

How We Optimize Heating Service Operations

Proper execution of heating repair & system service is essential for preventing furnace thermal cracks and ensuring correct heat staging. When HVAC systems operate under heavy Florida summers or freezing winter mornings, minor mechanical discrepancies quickly lead to high energy draws, refrigerant leaks, or critical components failing.

To prevent these failures, our NATE-certified technicians carry state-of-the-art diagnostic instruments, including combustion analyzers, gas pressure gauges, and flame sensor cleaners. This equipment allows us to verify system static pressure, electrical current draws, and temperatures splits to verify operations align with manufacturer design sheets.

We recommend scheduling this service on a annual inspection before the first winter freeze warning basis. Keeping a tight preventative routine ensures your system satisfies warranty terms, reduces utility bills, and prevents sudden comfort losses.

Field Reports

Recent Heating Service Case Studies

Real examples of our NATE-certified technicians performing heating service work across Northeast Florida.

RiversideJune 2026

Auxiliary Electric Heat Strip Replacement on Herschel St in Riverside

Herschel St, Riverside

Property Type: 1920s historic craftsman home

The Problem: The thermostat called for heat, but the system blew cool air during a freezing winter night.

Discovery & Diagnostic: The 10 kW auxiliary electric heater bank limit switch had failed, open-circuiting the power coil loops.

Resolution: Replaced the auxiliary heater core assembly with a new 10 kW OEM kit and calibrated staging on the digital thermostat.

HeatingImmediate 10kW
SafetyTested OK
ThermostatCalibrated
NocateeMay 2026

Gas Furnace Ignition and Flame Sensor Restoration on Pine Shadow Pkwy in Nocatee

Pine Shadow Pkwy, Nocatee

Property Type: active adult townhome with high-efficiency build

The Problem: The natural gas furnace would cycle on, ignite for 3 seconds, and immediately shut down, blowing cold air through the ducts.

Discovery & Diagnostic: The system threw a flame failure flash code. We inspected the gas burner compartment and found the flame sensor coated in carbon buildup, preventing the controller from detecting ignition and causing a safety shutdown.

Resolution: We cleaned the flame sensor using a specialized non-abrasive pad and cleaned the gas burners. We tested gas manifold pressures, verified combustion exhaust draft, and verified that the furnace now holds ignition safely and consistently.

Furnace100% Reliability
COPassed (0 ppm detected)
GasBalanced to 3.5 inches W.C.
MandarinMay 2026

Heat Pump Reversing Valve Diagnostics & Repair on Brady Rd in Mandarin

Brady Rd, Mandarin

Property Type: suburban family house near Loretto Rd

The Problem: The system was blowing cold air when switched to 'Heat' mode. The outdoor condenser unit made a loud clicking sound but did not reverse cycle.

Discovery & Diagnostic: We checked voltage to the reversing valve solenoid coil and confirmed it was receiving 24 volts. The solenoid coil was functional, but the mechanical slide inside the valve body was stuck due to internal system debris.

Resolution: We recovered the refrigerant charge, removed the stuck reversing valve, and welded a new OEM reversing valve into place using a nitrogen purge. After pulling a vacuum to 350 microns, we recharged the system. Heating and cooling cycles now switch perfectly.

ReversalInstantaneous cycle switch
Vacuum350 microns achieved
SystemPassed heating & cooling loads
FAQ

Heating Service FAQs

Why does my AC smell like burning when I turn on the heat?
If you haven't used your heat in months, dust accumulates on the heat strips or heat exchanger. This dust burns off during the first run. If the smell persists, turn off the system and call us.
What is auxiliary or emergency heat?
Auxiliary heat is secondary electric heat strips that turn on when the outdoor temperature drops too low for the heat pump to keep up. If the 'EM Heat' light stays on constantly, your heat pump may have a fault.
Do you repair gas furnaces in Jacksonville?
Yes. Our team is fully trained and certified to perform safety checks, burner adjustments, and repairs on natural gas and propane furnace systems.
How does a heat pump work in the winter?
Unlike a gas furnace that generates heat, a heat pump reverses the refrigeration cycle to extract heat from the outdoor air and move it indoors. They are highly efficient down to 35°F, below which auxiliary heat strips activate.
Why is my heat pump blowing cold air in heat mode?
This is often caused by a failed reversing valve, low refrigerant, or a system sensor fault. Alternatively, if the system is in defrost mode (melting ice off the outdoor coils), it may blow cool air briefly.
How often should heating systems be checked?
We recommend a heating safety check once a year in the late autumn, especially for gas furnaces to inspect the heat exchanger for cracks that could leak carbon monoxide.
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Schedule your heating service today

Fill out the form below to schedule a flat-rate diagnostic or system consultation. We respond immediately during business hours.

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