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Commercial Furnace Repair & Installation in NYC
No heat in your warehouse, shop or office is a business problem. Com+ Mechanical repairs, replaces and installs commercial gas furnaces, unit heaters and rooftop heating sections across NYC and the surrounding area.
Common Commercial Furnace Problems
No heat
Failed igniter, flame sensor, gas valve or control board.
Short cycling
Overheating from dirty filters, poor airflow or a failing limit switch.
Burner lights then shuts off
Dirty flame sensor or a venting / pressure switch fault.
Loud blower or rattling
Worn motor bearings, a loose wheel or a failing inducer.
CO alarm or soot
Possible cracked heat exchanger or venting problem — shut it down and call.
Uneven heat
Airflow, ductwork or zoning problems.
Furnace Repair, Replacement and New Installs
Most commercial furnace failures come from ignition, flame sensing, blower or venting problems. We find the real cause, check combustion safety and give you written repair or replacement options before work starts.
What Our Furnace Service Covers
Why Fix It Right the First Time
Our Simple Process
From call to comfort in 5 easy steps
Call
Tell us the building, the unit and what it's doing.
Diagnose
We test ignition, airflow, controls and combustion.
Written options
Repair or replacement, approved before we start.
Fix or install
We complete the repair or install the new unit.
Safety test
We confirm safe combustion and full heat before we leave.
Why Building Owners Call Com+
Commercial only
Warehouses, retail, offices and light industrial.
Safety first
Combustion and CO checks on every call.
Root-cause repair
We fix why it failed, not just the symptom.
Clear scope
Written options before any work begins.
Transparent Pricing
No fees. No surprises. Just honest service.
Repair visit
Find and fix the failing part.
- Full diagnosis
- Written options
- Safety test
Replacement
Swap an old or unsafe furnace.
- Sizing check
- Removal & install
- Start-up
New installation
Heat for a new or renovated space.
- Load calculation
- Venting & gas tie-in
- Ductwork
Final pricing is confirmed in writing after a site visit.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 15% off all services, and priority scheduling.
Equipment & Brands We Service
Factory-trained technicians for all major HVAC manufacturers
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Don't see your brand? We service all major manufacturers! Call us to confirm.
Serving the New York City Metro Area
Commercial HVAC service for buildings across the five boroughs and nearby counties
Frequently Asked Questions
Get answers to common questions about our services
Do you repair commercial furnaces in NYC?
Yes. We repair, replace and install commercial gas furnaces and unit heaters for warehouses, retail, offices and garages across our service area.
Should I repair or replace my commercial furnace?
A single failed part on a sound furnace is usually worth fixing. Older units with a cracked heat exchanger or repeated breakdowns are usually better replaced. We give you both options in writing.
Do you handle emergency no-heat calls?
Yes. We dispatch 24/7 for commercial no-heat emergencies.
Can you replace a furnace with a heat pump?
Often, yes. For buildings planning for Local Law 97, we can quote a heat pump option alongside a like-for-like furnace replacement.
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EPA-certified · factory-trained · fully insured
Most Requested Services
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Explore Commercial HVAC Resources
Equipment services, industry expertise, NYC compliance, and the metro areas we cover.
Equipment, Repair & Maintenance
- Commercial HVAC Repair
- Commercial HVAC Installation
- Commercial HVAC Replacement
- Commercial Water Heater Repair
- Air Handler Installation
- Rooftop Unit (RTU) Repair
- VRF / VRV Installation
- Commercial Heating Service
- Commercial Boiler Repair
- Commercial Chiller Repair
- PTAC Repair & Replacement
- Cooling Tower Service
- Commercial AC Repair
- Air Handler Replacement
- Cooling Tower Maintenance
- Walk-In Cooler & Freezer Repair
- Building Automation (BAS)
- Preventive Maintenance
- HVAC Service Agreements
- 24/7 Emergency HVAC