Load Calculation & Sizing
In-home assessment, room measurement, and a full load calculation determine the right capacity and configuration — single-head for one room, or multi-head for zone control across spaces.
Efficient heating and cooling for any room.
Mini-split heat pumps deliver efficient heating and cooling without ductwork — perfect for homes where central air isn't practical, or for zoning specific rooms. Harmon Heating & Cooling installs LG, Armstrong Air, and other premium mini-split systems with expert design, professional installation, and full system testing. A properly sized and installed mini-split keeps you comfortable year-round while saving energy and operating quietly.
Mini-splits offer zone control — heat one room while others stay cool — and use 25–30% less energy than window units or less efficient central systems. Our family-owned team sizes your system correctly, positions the indoor unit for even air distribution, runs all refrigerant lines professionally, and tests thoroughly before handoff. You get a quiet, efficient system that works for decades with minimal maintenance.
Mini-split sizing depends on your room size, insulation, climate control goals, and window/door count. We assess your space and recommend the right system — single-head for one room, or multi-head for zone control across multiple spaces. You can also compare with our mini-split repair option or protect your new system with maintenance.
Zoned Comfort Control
35+ Years of Experience
25–30% More Efficient
Manufacturer-Trained
Local to Fishers
Five steps from your first room assessment to a system you've watched us test and been trained to operate.
We visit your home to assess the room or rooms you want to condition. We measure square footage, evaluate insulation, check window and door sizes, review your comfort goals, and discuss zone preferences. This data determines the right capacity (measured in BTU) and number of heads your system needs.
Based on the assessment, we recommend mini-split units sized to your room. We explain capacity, efficiency (SEER/HSPF ratings), noise levels, and features, then provide a detailed quote covering equipment, unit placement, refrigerant lines, electrical, labor, testing, and startup. No surprises.
We schedule installation at your convenience and confirm electrical access, outdoor condenser placement, and refrigerant line routing. We prepare the site and ensure all materials and tools are ready for the installation day.
Our licensed technicians install the outdoor condenser, run and insulate refrigerant lines, mount the indoor unit, and connect all electrical. We evacuate the system, charge with the correct refrigerant, and pressure-test all connections. Proper evacuation is critical — it prevents compressor damage and ensures peak efficiency.
We run the system in both heating and cooling modes to verify proper operation, even air distribution, noise levels, and thermostat response. We walk you through remote control operation, seasonal adjustments, filter cleaning, and maintenance schedules. You're ready to use and care for your new mini-split confidently.
From load calculation to warranty registration, these are the steps we complete on every ductless installation.
In-home assessment, room measurement, and a full load calculation determine the right capacity and configuration — single-head for one room, or multi-head for zone control across spaces.
We place and level the outdoor condenser, confirm placement during scheduling, and route refrigerant lines cleanly for efficient, quiet operation.
Lines are run, insulated, and routed to manufacturer specs. We evacuate air and moisture, charge with the correct refrigerant, and pressure-test all connections.
The wall-mounted indoor unit is positioned for even air distribution and securely installed, with condensate drain and electrical connections completed.
We handle all wiring, disconnect switches, and controls, verify breaker capacity, and run electrical safety checks so the system integrates safely with your home.
We run a full-capacity heating and cooling test, verify airflow and temperature, check noise levels, and confirm thermostat response before handoff.
We walk you through remote control operation, seasonal mode switching, and filter cleaning technique so you can care for your system confidently.
We register your warranties, provide documentation, recommend a maintenance plan, and leave you with a direct number to call if anything comes up.
Your new mini-split system works best with annual care. Protect it with our maintenance plan — filter cleaning, coil inspection, system testing, and performance verification keep it running efficiently and reliably for decades.
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 install ductless mini-split systems across Central Indiana. Fishers is our headquarters, with Westfield just west, Noblesville to the north, Fortville 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.
If your mini-split system needs repair or maintenance, our team handles it — and if you're not sure which service you need, start with the full mini-split lineup.
Mini-splits deliver efficient heating and cooling with zone control — perfect for homes where central air isn't practical. Harmon Heating & Cooling sizes your system correctly, installs it professionally, and tests thoroughly so you get reliable comfort and efficiency. Our family-owned team is manufacturer-trained and committed to getting it right.
Call 317-588-8303 or request your free mini-split installation quote today. Flexible financing is available through Service Finance — spread costs over manageable monthly payments, and protect your system with annual maintenance.
