New RTU Installation
A new RTU installation for an expansion or a first system. We coordinate roof access, connect ductwork, run electrical and controls, and verify full operation before you take over.
Efficient Commercial Heating and Cooling
Commercial rooftop units (RTUs) provide efficient heating and cooling for retail stores, offices, warehouses, and light commercial buildings. RTUs combine furnace and air conditioning in one compact unit mounted on the roof, saving indoor space while delivering powerful climate control. Harmon Heating & Cooling installs and maintains commercial rooftop units from leading manufacturers, handling everything from initial design through installation, startup, and ongoing maintenance to keep your business comfortable and your HVAC system running reliably.
Commercial RTUs are built tough for demanding applications — they handle continuous operation, seasonal load changes, and years of reliable service. Our technicians understand commercial HVAC systems, building codes, and the efficiency standards that keep operating costs low.
Whether you're upgrading an aging RTU, installing a new unit for an expansion, or maintaining your current system, Harmon Heating & Cooling provides expert service tailored to commercial applications.
Commercial HVAC Experts
35+ Years of Experience
Uptime-Focused Service
Manufacturer Trained
Local to Fishers
Four steps from your first assessment to a system we've watched run through full heating and cooling cycles before handoff.
We evaluate your commercial space — square footage, insulation, occupancy, heat-generating equipment — to determine the right RTU capacity. We review existing ductwork, roofing, and electrical service to plan the installation. This covers commercial space evaluation and load calculation, RTU capacity sizing for your building, roofing and structural assessment, ductwork and electrical service review, and installation plan and timeline development.
We recommend RTUs matched to your building's needs and budget. We explain efficiency ratings (SEER/HSPF), warranty options, and long-term operating costs. You get a detailed proposal with all costs and scheduling — RTU recommendations at your budget level, equipment efficiency and performance explanation, an itemized quote including installation and startup, maintenance plan options, and warranty and support details.
Our technicians install the RTU on your roof, connect ductwork, run electrical and controls, and integrate with your building's systems. Installation typically takes 1–3 days depending on complexity. Work includes RTU placement and secure mounting, ductwork connection and sealing, electrical wiring and circuit integration, control system installation and programming, roofing work and weatherproofing, and commissioning and startup testing.
Before final handoff, we run the RTU through full heating and cooling cycles to verify performance. We train your building managers on operation, maintenance needs, and emergency procedures — full-capacity heating and cooling testing, control system operation training, maintenance schedule and filter replacement guidance, contact and support information, and warranty documentation and registration.
Whether you need a new RTU installation, repair of an existing unit, or maintenance planning, we provide solutions tailored to your commercial building's needs.
A new RTU installation for an expansion or a first system. We coordinate roof access, connect ductwork, run electrical and controls, and verify full operation before you take over.
Repair of an existing unit to restore reliable heating and cooling. We prioritize commercial repair calls during business hours and have rapid access to replacement parts to minimize downtime.
Regular maintenance keeps RTUs running efficiently and catches problems before they become failures. We build a maintenance schedule matched to your building's demands.
Protect your RTU with our commercial maintenance plans. Regular service keeps your system efficient and catches problems early — a trained technician checks refrigerant, tests electrical connections, cleans coils, and verifies performance before demand peaks.
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 and service commercial rooftop units across Central Indiana. Fishers is our home base, with Westfield to the west, Noblesville north and east, Carmel to the north, and Fortville and Pendleton to the southeast and 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.
The same team that handles your rooftop units also covers your cooling, heating, and financing needs.
Harmon Heating & Cooling provides expert rooftop unit installation, repair, and maintenance for commercial buildings. Whether you need a new RTU, a repair, or preventive maintenance, we keep your business comfortable and your HVAC system running efficiently. Our commercial HVAC expertise and uptime-focused service mean minimal disruption to your operations.
Call 317-588-8303 or schedule a rooftop unit assessment today. Flexible financing is available for commercial HVAC equipment and installation.
