Commercial Furnace Installation & Repair | Denver Metro | On Time Heat & Air
Commercial gas furnaces up to 400,000 BTU · All brands · Rooftop packaged & indoor units · Same-day service available
Colorado winters can be severe. A commercial furnace failure in January means frozen pipes, uncomfortable customers, and potential health and safety issues. On Time Heat & Air provides fast, reliable commercial furnace service across the Denver metro — with same-day response and transparent pricing on all brands up to 400,000 BTU.
Commercial Furnace Types On Time Services
Commercial heating in Colorado takes several forms. On Time services and installs all of the following:
Rooftop Packaged Gas Units
The most common commercial heating solution in Denver. A gas furnace integrated into a rooftop packaged unit (RTU) provides both heating and cooling from a single rooftop cabinet. Available from 60,000 BTU to 400,000 BTU. On Time installs and services all major brands.
Indoor Commercial Gas Furnaces
Standalone commercial gas furnaces installed in mechanical rooms, utility closets, or attic spaces. Common in older commercial buildings and in applications where rooftop mounting is not practical. Available from 60,000 BTU to 400,000 BTU.
Make-Up Air Units (MAU)
Commercial make-up air units heat fresh outside air before introducing it into the building. Critical for restaurants with commercial kitchen exhaust systems. On Time installs and services gas-fired make-up air units for restaurants and commercial kitchens across the Denver metro.
Unit Heaters
Gas-fired unit heaters for warehouses, garages, and large open commercial spaces. Suspended from the ceiling, they provide direct radiant and convective heat without ductwork.
Commercial Furnace BTU Guide
60,000–100,000 BTU: Small offices, small restaurants (under 2,000 sq ft)
100,000–150,000 BTU: Mid-size restaurants, gas stations, small retail (2,000–4,000 sq ft)
150,000–250,000 BTU: Large restaurants, mid retail, churches (4,000–10,000 sq ft)
250,000–400,000 BTU: Large retail, schools, multi-tenant office (10,000–25,000+ sq ft)
On Time's Commercial Furnace Scope
On Time services commercial gas furnaces up to 400,000 BTU. This covers the vast majority of light commercial buildings in the Denver metro. For industrial heating applications requiring larger equipment, we can refer you to appropriate contractors.
Emergency Commercial Furnace Service
Commercial furnace failure in winter is an emergency. On Time offers same-day commercial furnace repair across the Denver metro. Call (720) 527-0668 — our team answers most calls personally.
Commercial Furnace Services
Commercial Furnace Replacement
Full commercial furnace replacement including equipment removal, new unit installation, gas line connection, flue/venting, electrical, and startup commissioning. All brands available.
Commercial Furnace Repair
Heat exchanger inspection, igniter replacement, gas valve repair, inducer motor replacement, control board diagnostics, and all other commercial furnace repairs. Same-day service available.
Annual Furnace Maintenance
Pre-season commercial furnace maintenance to ensure reliable winter operation. Includes burner cleaning, heat exchanger inspection, flue inspection, gas pressure check, and safety control testing.
Carbon Monoxide Safety Inspection
Commercial heat exchanger inspection and CO testing. A cracked heat exchanger is a serious safety hazard. On Time performs thorough CO safety inspections for all commercial furnace types.
New Commercial Furnace Installation
New commercial furnace installation for new construction or first-time heating. Includes load calculation, equipment selection, gas line sizing, venting design, and full commissioning.
Commercial Maintenance Contracts
Annual commercial furnace maintenance contracts with priority emergency response. Includes pre-season inspection, filter service, and detailed service reports.
Commercial Furnace Brands On Time Services
| Brand | Commercial Furnace Line | BTU Range | Notes |
|---|---|---|---|
| Carrier | 48/50 Series (packaged), 58 Series (indoor) | Up to 400K BTU | Strong parts availability in Denver |
| Trane | Precedent / Voyager (packaged), XB/XV (indoor) | Up to 400K BTU | Industry-leading reliability |
| Lennox | LGH/LCH (packaged), CBH/CBX (indoor) | Up to 400K BTU | High efficiency options available |
| York | ZH/ZF (packaged), P Series (indoor) | Up to 400K BTU | Competitive commercial pricing |
| Rheem / Ruud | RKHA (packaged), Classic Series (indoor) | Up to 400K BTU | Budget-friendly commercial option |
| Daikin | DPS/DPH (packaged) | Up to 300K BTU | Strong energy efficiency ratings |
| Goodman | GPC/GPH (packaged) | Up to 200K BTU | Best value for smaller commercial |