Check controls first
Confirm thermostats, schedules and the building management system are calling for heat.
Commercial building has no heat?
Loss of heat in a commercial building affects occupants, operations and pipes. Call 833-877-1717 with the address and which systems are down. RepairNowUSA connects the request. An independent commercial HVAC provider does the work.
Am I in the right place?Yes for rooftop units, boilers, furnaces or unit heaters not heating, or parts of the building going cold.
Is this urgent?Yes in freezing weather. Frozen sprinkler and water pipes are a major risk. If you smell gas, leave the building without switching anything on or off and call the gas utility or 911 from outside. If a carbon monoxide alarm sounds, get everyone out and call 911.
What do I do next?Call 833-877-1717 with the ZIP code, building type, and which systems are affected.
Rooftop units: RTU repair. Burst pipes after losing heat: commercial emergency plumbing.
RepairNowUSA editorial review · Last substantively reviewed October 14, 2026 · Review standards
Protect the building
Protect pipes
In freezing weather, open doors under sinks and keep water moving if it is safe. Note any areas at risk of freezing.
Gas or CO alarm: get out
If you smell gas or a carbon monoxide alarm sounds, evacuate and call the gas utility or 911 from outside.
Gas and CO
If you smell gas, leave the building without switching anything on or off and call the gas utility or 911 from outside. If a carbon monoxide alarm sounds, get everyone out and call 911.
Common commercial heating failures
Rooftop unit heat failure
Gas heat sections and ignition controls on rooftop units fail. See rooftop unit repair.
Boiler failure
Boilers can lock out from ignition, water level or pressure problems, leaving radiators or coils cold.
Unit heaters in warehouses
Gas-fired unit heaters in warehouses and garages fail from ignition and venting problems.
Frozen pipes risk
Without heat, pipes and some sprinkler systems can freeze. See frozen pipe repair.
What to have ready when you call
- Property ZIP code and building type
- Which systems are down: rooftop units, boiler, furnaces or unit heaters
- Zones affected and outdoor temperature
- Any gas smell, CO alarm or error codes
- Occupancy and freeze risk
- Who can authorize work and any vendor requirements, such as a COI
How commercial heating repair usually works
- Diagnosis. The technician checks controls, gas supply, ignition, safety switches and venting.
- Restore heat. Failed ignition parts, sensors, motors or controls are replaced where possible on the first visit.
- Temporary heat. For long repairs, temporary heaters may protect occupied areas and pipes.
- Safety checks. Venting and combustion are checked so the system runs safely.
Unoccupied buildings can freeze quickly. If heat is out in freezing weather, tell RepairNowUSA about freeze risk when you call.
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 commercial heating 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 833-877-1717Commercial heating questions
What if pipes freeze while the heat is out?
Shut off water to frozen sections if you can and call. Frozen pipes can burst when they thaw.
Can we use portable heaters?
Only heaters rated for the space, kept away from combustibles, and never unvented fuel heaters indoors without proper ventilation.
Does RepairNowUSA guarantee response times?
No. RepairNowUSA connects you with a participating independent provider when one is available. Timing depends on location and capacity.
Why does the boiler keep locking out?
Common causes are ignition problems, low water, pressure issues or venting faults. A technician needs to diagnose it.
Can I call at night or on a weekend?
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.