Choosing propane heat for a shop, barn, or agricultural building typically comes down to radiant tube (infrared) vs. unit heaters (forced air). Both can work well—if you match the system to your building height, insulation, door traffic, and how you actually use the space.
How the heat feels: infrared vs. forced air
Radiant tube heaters produce infrared radiant energy that primarily warms people, floors, animals, tools, and equipment (then those warmed surfaces gently warm the surrounding air). That “heat coming down” feeling is infrared—more like standing in sunshine than standing next to a warm vent. The physics and terminology are well described in this AHRI guide on infrared heaters.
Unit heaters warm the air and use a fan to circulate it. In taller spaces, heated air naturally rises, which can create stratification—warmer air near the ceiling while the work zone stays cooler. Field observations and performance discussions for high-bay heating show up clearly in the U.S. Department of Energy’s gas-fired heater demonstration report.
Radiant tube heaters: best for tall, drafty, or “in-and-out” buildings
Radiant tube heat is often the best fit when you want comfort at floor level without paying to overheat the ceiling. Properly designed, the system directs radiant energy downward, heating what’s below it—exactly why it’s so effective in big-volume spaces (and why it’s a strong option for barns and many agricultural buildings) as explained in the AHRI infrared heater overview.
Why we recommend radiant tubes for barns, ag buildings, and nurseries
- Floor-level comfort in high ceilings: You feel warm where you stand, not just where the air collects.
- More forgiving with door openings: When a big door opens, warm air dumps fast—but warmed surfaces keep delivering comfort.
- Zoned heating: Heat stalls, work bays, or specific zones without heating every cubic foot of the building.
- Great for working/ag environments: Infrared is widely used in practical, ventilated spaces where comfort matters in the occupied zone.
Key planning considerations
- Line-of-sight matters: Radiant warms what it can “see,” so layout and spacing are important.
- Clearances and correct installation matter: Radiant tubes run hot—placement and safety clearances must be handled professionally.
- Ventilation is separate: Barns and nurseries may still need dedicated ventilation for humidity and air quality.
Unit heaters: best for smaller, tighter shops (or when you need fast air warm-up)
Unit heaters are popular because they’re straightforward and can be cost-effective in smaller buildings. In many applications they’re chosen for practical reasons like install simplicity and cost, which is consistent with how the DOE frames common gas-fired space-heating approaches in its high-bay heating demonstration report.
Where unit heaters shine
- Lower ceilings and tighter envelopes
- Shops with minimal door cycling
- Spaces needing quick air-temperature changes (warm the air, start working)
- Ability to regulate temperatures through the use of a thermostat. (Efficiency)
The common downside: stratification
In taller buildings, unit heaters can push warm air to the ceiling first. One proven solution is destratification—mixing trapped ceiling heat back down into the occupied zone. Many HVAC manufacturers treat this as a standard fix (example: destratification fans).
Quick comparison table
| Factor | Radiant Tube (Infrared) | Unit Heater (Forced Air) |
| What gets warmed first | People/surfaces (comfortable “heat coming down”) per AHRI’s infrared overview | Air (then distributed with a fan) |
| Tall ceilings | Excellent | Often needs mitigation (stratification) |
| Door openings | More forgiving | Loses warmed air quickly |
| Air movement / dust | Minimal air movement | More air movement (can stir dust) |
| Best-use cases | Barns, ag buildings, nurseries, high bays | Smaller/tighter shops, quick warm-up needs |
| Typical add-ons | Zoning/layout strategy | Destratification fans in tall spaces |
One building-envelope tip that saves propane
Before you size any heater, address the basics: roof integrity, air sealing, and insulation. If the building leaks air (or the roof assembly performs poorly), you’ll pay for it every hour the system runs—especially in large-volume structures.
Get the right propane heat for your building
At Collett, we help Southwest Ohio customers choose propane heating that fits the building and the workload—whether that’s radiant tubes for a barn, or a unit heater setup for a shop that’s insulated and sealed. If you want a recommendation sized to your space and usage, reach out through our contact form and include your building dimensions, ceiling height, insulation level, and how often doors are opened.