Commercial HVAC
Rooftop Unit (RTU) Replacement in New Jersey
Rooftop unit (RTU) replacement in NJ — commercial packaged units sized, permitted & installed for Monmouth & Middlesex County buildings by Guardian Air.
Rooftop unit (RTU) replacement in NJ is a planned project, not a panic purchase — when it is done right. Guardian Air replaces packaged rooftop units for offices, retail, restaurants, and multi-family buildings across Monmouth and Middlesex County and the rest of central New Jersey, with a site survey, a written quote, and a changeover scheduled around your business.
Explore our full range of commercial hvac services — including commercial hvac maintenance and commercial hvac repair — or contact us for fast service across Monmouth, Middlesex & Ocean counties.
Repair or Replace the RTU?
A rooftop unit with a failed contactor or fan motor is a repair. One with a failed compressor late in life, a cracked heat exchanger in the gas section, a corroded cabinet, or a refrigerant that is no longer economical to service is usually a replacement candidate. We weigh age, repair history, and energy use, and give you both numbers in writing so the decision is easy to defend to owners or a board.
Sizing, Curbs & Efficiency
We don't assume the old tonnage was right. Tenant changes, new walls, and different occupancy all shift the load, so we check it before specifying the new unit. Where the replacement doesn't match the existing roof curb, we use a curb adapter instead of cutting the roof. New units bring higher-efficiency compressors, better economizers, and modern controls that can cut operating costs on long-running commercial schedules.
Planning the Changeover
Most like-for-like rooftop unit replacements are scheduled as a single-day changeover per unit, often early in the morning or on a Saturday. We coordinate the crane lift, the gas, electrical, and condensate connections, and the permit and inspection with your town's construction office, then commission the unit and leave you a written record of the startup readings.
After installation, a commercial HVAC maintenance contract keeps the new unit's warranty documented and its coils, belts, and filters on schedule.
RTU Replacement in Monmouth & Middlesex County
Our commercial crews replace rooftop units on buildings throughout Monmouth County — Red Bank, Freehold, Middletown, and Long Branch — and Middlesex County, from Edison and Woodbridge to New Brunswick and Old Bridge, as well as the Ocean County commercial corridors in Toms River, Brick, and Lakewood. Multi-site owners can phase replacements across properties under one agreement.
Frequently Asked Questions
How long does a rooftop unit replacement take?
A like-for-like RTU swap on an existing curb is usually completed in one day per unit, including the crane lift, connections, and startup. Curb adapters, electrical upgrades, or roof repairs can add time, which we schedule in advance so the building is never left without a plan.
What does RTU replacement cost?
It depends on tonnage, gas or electric heat, efficiency, whether a curb adapter is needed, crane access, and electrical work. We survey the roof and equipment for free and give you a written, itemized quote — usually within two business days.
Can a new RTU sit on the old roof curb?
Often, yes. When the new unit's footprint differs, a factory or fabricated curb adapter bridges the gap without cutting or re-flashing a new roof opening.
Do you handle permits for RTU replacement?
Yes. Commercial HVAC equipment replacement is permitted work under the New Jersey Uniform Construction Code, and we file the permit and coordinate the inspection with your municipality.
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