Check the thermostat or controls
Confirm the setpoint, mode and schedule, and that the building management system is not overriding the unit.
Commercial rooftop unit down?
Rooftop units heat and cool most commercial buildings. When one fails, the zone it serves gets hot or cold fast. Call 833-877-1717 with the address, unit count and what is down. RepairNowUSA connects the request. An independent commercial HVAC provider does the work.
Am I in the right place?Yes for an RTU not cooling or heating, tripping, alarming, leaking into the building, or making loud noises.
Is this urgent?Yes when occupants, customers, inventory or equipment are affected.
What do I do next?Call 833-877-1717 with the ZIP code, number of units and which zones are affected.
Whole building: commercial HVAC. Water coming through the roof: commercial roof leak.
RepairNowUSA editorial review · Last substantively reviewed October 14, 2026 · Review standards
Before the provider arrives
Note which zones are affected
List the rooms or suites served by the failed unit and what you notice: no cooling, no heat, no airflow or alarms.
Keep staff off the roof
Rooftop units involve fall hazards and high voltage. Leave inspection to trained technicians.
Do not send staff to the roof
Roof edges, skylights and high-voltage equipment are serious hazards. Leave rooftop work to trained technicians.
Common RTU failures
No cooling
Failed compressors, fan motors, capacitors or low refrigerant stop cooling. See commercial AC repair.
No heat
Gas heat sections, ignition controls and electric heat strips fail too. See commercial heating repair.
No airflow
Broken belts, failed blower motors and clogged filters leave the space without air movement.
Water leaking around the unit
Clogged condensate drains or failed curb flashing can leak into the ceiling below. See commercial roof leak repair.
What to have ready when you call
- Property ZIP code and building type
- How many rooftop units and which one failed, if known
- Zones affected and symptoms
- Unit brand and approximate age, if known
- Roof access and an on-site contact
- Who can authorize work and any vendor requirements, such as a COI
How rooftop unit repair usually works
- Diagnosis. The technician checks controls, power, belts, motors, refrigerant circuits and heat sections.
- Repair. Failed parts such as capacitors, contactors, motors and belts are replaced, often on the first visit.
- Parts orders. Compressors and brand-specific parts may need to be ordered.
- Temporary options. Portable cooling or heating can help critical spaces while parts are on the way.
Regular maintenance, such as filter changes, belt checks and coil cleaning, prevents many rooftop unit failures.
What happens when you call RepairNowUSA
- Describe what is happening in plain words and give the property ZIP code. You do not need to know which trade to ask for.
- RepairNowUSA checks for a participating independent provider who handles rooftop unit (RTU) repair in that area.
- If one is available, you are connected. The provider confirms timing, access, scope and price with you before any work.
- The provider, not RepairNowUSA, diagnoses and performs the repair.
RepairNowUSA is a referral and connection service. Provider availability and response times vary by location, time and demand, and are not guaranteed. Before you approve work, ask what was found, the price, the timing and what is not included.
Call 833-877-1717Rooftop unit questions
What is an RTU?
A rooftop unit is a packaged heating and cooling system installed on the roof that serves the space below through ducts.
Why is water leaking around my rooftop unit?
A clogged condensate drain or failed curb flashing is common. The unit and the roof may both need attention.
Can a technician work on any brand?
Many commercial HVAC technicians service major brands, but parts availability varies. Share the brand and model if you can.
How long does an RTU repair take?
Many repairs are done in one visit. Major parts like compressors may need ordering, which can take days.
Can I call at night?
Yes. You can call 833-877-1717 at any time, including nights, weekends and holidays. Whether an independent provider can come out right away depends on your ZIP code, the time and provider capacity, so availability is not guaranteed.
Authoritative references
These public sources give general safety context. They do not replace an on-site evaluation, and RepairNowUSA does not perform the work.