Commercial Rooftop Unit (RTU) Service on Long Island

Our Housecall Pro records show 45 rooftop and package-unit jobs at 28 commercial sites between May 2022 and August 2026. These are the problems we find most:

• Refrigerant leaks. On a Deer Park multi-unit visit this summer, one unit's second compressor was low on R-22, and another needed a nitrogen leak search, repair and recharge on both compressor circuits.
• Dirty coils. Heavily soiled condenser and evaporator coils cause high pressures and weak cooling. In Central Islip we chemically cleaned both coils and replaced filters and cleaned the drain lines as part of a tune-up.
• Economizer controls. On a Plainview unit, the enthalpy air sensor and the economizer zone controller were replaced and calibrated so the outdoor air damper responded properly again.
• Controls and time delays. On a two-compressor unit running on one, a time delay switch, thermostat controller and economizer zone controller were replaced, and both stages ran again.
• Compressors. Our records include RTU compressor replacements, and a failed compressor is the point where we price repair and replacement side by side.
• Filters, belts and drains. Clogged filters, worn belts and blocked condensate drains cause many no-cooling and water-on-the-ceiling calls.

A rooftop unit service call follows this order:

1. Tell us which unit. When you call, tell us the unit number or the space it serves, what it's doing and any thermostat or controller alarms. If there's a work order number, have it ready.
2. Safe roof access. The technician confirms roof access with your building contact, then locks out power at the unit disconnect before opening panels.
3. Diagnosis. They check filters, belts, coils, capacitors, contactors and motors, test each compressor circuit and its pressures, the economizer and the controls, and watch a full cycle.
4. Written findings and a price. You get the cause, the repair and the price for approval, plus notes on the unit's age and condition.
5. Repair and test. After approval we make the repair, run the unit in cooling or heating, and confirm supply air temperature and drain flow before leaving.

We don't publish rooftop unit prices on this page. Repairs range from a filter change to a compressor, and replacement depends on tonnage, the curb, rigging and duct connections. You get a written price before any repair or replacement goes ahead.

What moves the price:

• The repair. A sensor, a controller, a motor, a leak repair and a compressor are each very different jobs.
• Refrigerant. Older units on R-22 cost more to recharge, because the refrigerant is no longer produced.
• Unit size and count. A 7.5-ton RTU takes more time than a 3-ton package unit, and a dozen units take more than one.
• Access and timing. Roof hatches, ladders, cranes for replacements and after-hours work all affect the price.

Commercial maintenance plans include a report on each visit and preferred response; see commercial maintenance plans. Financing is available through Rheem KwikComfort, with credit provided by Synchrony Bank, subject to credit approval. See financing for how it works. For business equipment, see commercial financing.

We give you the repair price and, on older units, the replacement price side by side. Repair is usually right for a control, sensor, motor, capacitor or a leak at a fitting. Replacement is worth pricing when a compressor fails on an aging unit, the unit runs on R-22, or several parts are failing at once. On one Plainview unit this year, the repairs worked, but the record notes that given the unit's age and condition, replacement is the more reliable long-term answer.

When a unit does need replacing, we disconnect and remove the old unit, set the new one on the curb, reconnect and retrofit the supply and return ducts and the drain, and start it up. In Farmingdale this summer, that meant replacing an old Trane rooftop unit with a new 7.5-ton Trane RTU. See commercial HVAC for how we plan replacements.

On each unit we replace filters, check belts and pulleys, inspect and clean the condenser coil, check the evaporator coil, flush the condensate drain, test capacitors, contactors and motors, check refrigerant pressures on every compressor circuit, test the economizer and controls, and check the heating section before the heating season. Our commercial rooftop unit maintenance checklist lists the items in more detail.

For multi-unit buildings, the report lists each unit by number, so the repairs we recommend during maintenance can be approved one unit at a time.

When a unit is old, or a space never feels right, a performance evaluation looks at how the unit is actually running: supply and return temperatures, pressures on each circuit, airflow, economizer operation and the condition of the coils, compressors and controls. You get a written summary and a recommendation to repair, monitor or plan a replacement, which helps when you're budgeting for several units across a building.

The lease usually decides who maintains and replaces rooftop equipment. Before you approve a large repair or a replacement, confirm with your landlord or tenant who owns the unit and who signs off. We can send the findings and price to both parties so the decision doesn't hold up the repair.

Long Island: see our Suffolk County service area.

Other commercial work? See commercial HVAC. Planning maintenance? See commercial maintenance plans and the RTU maintenance checklist.

Budgeting for a replacement? See commercial financing.