Refrigerant Leak Detection & Repair
Refrigerant leaks destroy efficiency and damage the compressor. We detect, repair, and recharge the system per EPA rules.
Expert Heat Pump Diagnostics and Repair
A central heat pump provides efficient heating and cooling through your home's existing ductwork — but when it stops working, you lose comfort and efficiency. Harmon Heating & Cooling repairs central heat pump systems from LG, Armstrong Air, Climate Master, and other brands with 35+ years of expertise. Our technicians diagnose exactly what's wrong and restore your system's heating and cooling reliability with manufacturer-approved repairs and honest, upfront pricing.
Central heat pumps are complex — refrigerant cycles, reversing valves, compressors, and electronic controls all work together. A single failure cascades into poor performance or total shutdown. Central heat pump problems require precision diagnosis. We test refrigerant pressure, electrical function, and airflow to pinpoint the failure. A thorough inspection leads to the right repair.
Ready for a new system instead of a repair? Explore heat pump installation options, or protect your system with maintenance.
Precision Diagnostics
35+ Years of Experience
EPA-Certified Refrigerant Work
Manufacturer-Trained
Local to Fishers
Catching any of these early usually means a smaller repair bill — and no stretch of lost heating or cooling.
If your heat pump runs but delivers no conditioned air, suspect refrigerant loss, compressor failure, or reversing valve problems. Loss of heating or cooling is the clearest sign something is seriously wrong.
Conditioned air comes out weakly, or some rooms stay cold while others get warm. This points to refrigerant problems, a failing compressor, or ductwork issues. A weak system overworks and wastes energy.
A distinctive refrigerant odor or visible fluid pooling at connections signals a leak. Low refrigerant cuts efficiency and damages the compressor. This demands immediate attention.
Grinding, squealing, hissing, or rattling from the compressor means mechanical wear or refrigerant issues. These noises precede failure.
Rapid cycling stresses the compressor and signals control issues, thermostat failure, or refrigerant problems. Erratic cycling is a red flag.
If bills spike without change in comfort settings, your heat pump is overworking due to refrigerant loss or component failure. A repair that restores efficiency saves money fast.
Five steps from your first call to a system you've watched us test in both heating and cooling before we leave.
Contact Harmon Heating & Cooling. Describe what you're noticing. We'll schedule a comprehensive diagnostic appointment with time for complete testing. You describe the problem, we confirm an appointment at your convenience, our technician arrives with diagnostic equipment, and we confirm access to the system.
We test refrigerant pressure and leaks, electrical circuits and control board, compressor function and amps, reversing valve cycle and performance, airflow and temperature, and thermostat response. We use gauges, multimeters, and thermal imaging to see exactly what's happening, and document with photos and notes.
We explain the failure clearly and present repair options and costs. You get a written estimate in clear language, a repair vs. replacement trade-off analysis, timeline and warranty details, and financing options if needed. You decide before any work begins. No surprises.
We perform repairs to manufacturer specifications. If refrigerant work is involved, we recover, evacuate, and recharge with EPA compliance. We pressure-test and verify leaks, run a full-capacity system test in both heating and cooling, and complete electrical and safety checks to confirm efficient air output.
We explain maintenance to prevent future failures and offer a maintenance plan that includes annual inspection, filter changes, and system testing. We provide homeowner maintenance guidance, preventive care recommendations, maintenance plan options, and a direct number to call with follow-up questions.
These are the failures we diagnose and repair most often on central heat pump systems.
Refrigerant leaks destroy efficiency and damage the compressor. We detect, repair, and recharge the system per EPA rules.
A failing compressor loses pressure, runs hot, or draws excessive current. We repair or replace with quality parts and verify operation.
The reversing valve switches between heating and cooling. If stuck, the system may be stuck in one mode. We test, clean, or replace it.
A failed expansion valve blocks refrigerant flow. We test and replace to restore proper metering.
Electrical failures prevent system response. We test and replace failed components.
Clogged coils reduce heat transfer and efficiency. We clean indoor and outdoor coils professionally.
Clogged filters restrict airflow. We replace filters and verify clear air distribution.
Loose connections or failed components prevent proper operation. We test and repair electrical systems.
Heat pump systems run most efficiently with regular care. Protect your investment with our maintenance plan — annual filter changes, coil cleaning, refrigerant verification, and system inspection keep it running reliably.
A new HVAC system is a real investment, and Harmon Heating & Cooling works with Service Finance to help make that investment manageable. Whether you're replacing an aging furnace before winter or upgrading to a more efficient central AC system, financing options are available so an unexpected repair or planned upgrade doesn't have to wait.
Our team can walk you through financing options through Service Finance at the time of your estimate, so you know what to expect before any work begins.
Contact Us to ApplyDon't wait on a failing furnace or AC — get your system installed today and spread the cost into manageable monthly payments.
Flexible terms keep payments predictable, so a new system fits your budget instead of draining your savings all at once.
Financing makes it easier to step up to a more efficient Armstrong system that lowers your energy bills month after month.
We repair central heat pump systems across Central Indiana. Fishers is our headquarters and gets expert repair locally, with Westfield just west, Noblesville to the north, Fortville to the east, Pendleton to the southeast, and Carmel to the south.
Don't see your city listed? Harmon Heating & Cooling serves additional communities throughout Central Indiana beyond our primary service area — reach out and we'll let you know if we cover your address.
Ready for a new, high-efficiency heat pump, or not sure which service you need? These are the paths we can walk you through, and the same team handles all of them.
A broken heat pump leaves you without efficient heating and cooling. Harmon Heating & Cooling brings EPA-certified expertise, manufacturer training, and 35+ years of experience to every heat pump repair. We diagnose precisely, explain honestly, and restore your system to full efficiency.
Call 317-588-8303 or schedule a heat pump repair appointment today. Flexible financing is available through Service Finance, and annual maintenance keeps your heat pump running reliably.
