Use this guide to compare the options and choose the right system for your building.
What Is a Commercial Furnace?
A commercial furnace works like a residential furnace, but at a larger scale. It’s typically located indoors in a mechanical room, basement, or utility area. The furnace generates heat and distributes it through ductwork.
Pros of Commercial Furnaces
- Lower upfront installation cost compared to RTUs
- Easy indoor access for service and maintenance
- Suitable for smaller or mid-sized commercial spaces
- Reliable performance in cold climates
Cons of Commercial Furnaces
- Uses indoor space that could be repurposed for operations
- May require multiple furnaces in larger buildings
- Limited integration with cooling (separate A/C equipment required)
What Is a Rooftop Unit (RTU)?
An RTU is a self-contained heating and cooling system installed on the roof. It handles both functions within a single unit, which is why it’s popular for larger facilities.
Pros of Rooftop Units
- Heating and cooling in one system
- Saves indoor floor space
- Easy to scale for large buildings with multiple units
- Quieter indoors since the unit is outside
- Many modern, energy-efficient options available
Cons of Rooftop Units
- Higher upfront installation cost
- Exposed to weather which can increase wear over time
- Requires roof access for servicing (may add time and cost)
Which Option Fits Your Building?
- Small to medium buildings (offices, small retail, clinics): a commercial furnace is often the most cost-effective.
- Large or multi-tenant buildings (shopping centres, warehouses, industrial): an RTU provides scalable heating and cooling in one package.
- Need to save indoor space? RTUs keep equipment outdoors.
- Focused on upfront savings? Furnaces usually win on initial cost.
Commercial Furnace vs. Rooftop Unit: Quick Comparison
| Feature | Commercial Furnace | Rooftop Unit (RTU) |
|---|---|---|
| Location | Installed indoors (mechanical room, basement, utility space) | Installed outdoors on the roof |
| Function | Heating only (separate A/C required) | Heating and cooling in one system |
| Best For | Small to medium-sized commercial spaces | Large commercial, retail, or industrial buildings |
| Space Requirements | Uses indoor floor space | Saves indoor space by staying outside |
| Noise Levels | Some indoor operating noise | Quieter indoors (noise stays on roof) |
| Installation Cost | Lower upfront investment | Higher initial cost |
| Maintenance Access | Easy indoor access for servicing | Requires roof access; exposed to weather |
| Scalability | May need multiple furnaces in large buildings | Easy to scale with multiple RTUs |
| Durability | Protected indoors; less weather-related wear | More exposure to elements; may need extra care |
Get Expert Advice for Your Building
Both commercial furnaces and rooftop units can deliver dependable heating. The best choice comes down to your layout, budget, and long-term plans.
Contact Harris Control Service to schedule a consultation. We’ll compare options for your property and install the system that best fits your priorities.