The best type of heater for an uninsulated garage is a propane or kerosene space heater, as they provide efficient, portable, and powerful heating in cold conditions.
Infrared heaters or portable propane heaters work best for uninsulated garages.
Working in a freezing, uninsulated garage? You’re not alone. Whether you’re tackling DIY projects, staining furniture, or simply trying to stay warm, the right heater can make all the difference. But with so many options—electric, propane, kerosene—how do you choose the best one for your space?
The right heater for an uninsulated garage balances efficiency, safety, and cost. In this guide, we’ll cover the top-performing heaters, their pros and cons, and expert tips to maximize warmth. For those considering propane, check our propane heater installation guide for safe setup steps.
Key Takeaways
- Infrared heaters provide instant, targeted warmth without heating the air—ideal for drafty spaces.
- Propane heaters deliver high heat output but require ventilation to prevent carbon monoxide buildup.
- Electric garage heaters are safer for finishes (e.g., polyurethane) but may struggle in extreme cold.
- Always prioritize safety features like tip-over switches and oxygen depletion sensors.
Top Heater Types for Uninsulated Garages
1. Infrared Heaters
Infrared heaters are a top choice for uninsulated garages because they heat objects and people directly, not the air. This makes them highly efficient in drafty spaces. Unlike convection heaters, which lose warmth through air leaks, infrared models maintain consistent heat. For safety insights, read our guide on indoor infrared heater safety.
Pros:
- Instant heat with no warm-up time
- Energy-efficient (no heat loss to air circulation)
- Quiet operation—no fans required
Cons:
- Limited range—best for small to medium garages
- Minimal air circulation
2. Propane Heaters
Portable propane heaters, like torpedo or radiant models, pack serious heat for large, uninsulated garages. They’re ideal for short-term use but require proper ventilation. A 20,000 BTU propane heater can warm a 2-car garage in under 30 minutes.
Pros:
- High heat output (up to 30,000 BTU)
- Works without electricity—great for power outages
- Affordable fuel costs
Cons:
- Produces condensation and fumes
- Requires CO detectors and cracked windows
3. Electric Garage Heaters
For those working with flammable finishes (e.g., stains), electric heaters are the safest option. Look for 5,000W 240V models for larger spaces or ceramic space heaters for small areas.
Pros:
- No fumes—safe for finishing projects
- Low maintenance
- Precise thermostats
Cons:
- Higher electricity costs
- May struggle in sub-20°F temps
Comparison Table: Garage Heaters
| Type | Best For | Avg. Cost | Heat Output |
|---|---|---|---|
| Infrared | Small/medium garages, spot heating | $100–$300 | 1,500–5,000 BTU |
| Propane | Large spaces, quick warmth | $80–$250 | 10,000–30,000 BTU |
| Electric | Safety-conscious users | $50–$500 | 3,000–10,000 BTU |
FAQs
Can I use a kerosene heater in an uninsulated garage?
Yes, but with caution. Kerosene heaters emit fumes and require ventilation. Avoid them if you’re applying finishes like polyurethane. For alternatives, see our propane vs. electric heater comparison.
How much BTU do I need for a 2-car garage?
Calculate 10,000 BTU per 300 sq ft. A typical 2-car garage (500 sq ft) needs ~16,000 BTU. For extreme cold, add 20% more.
Are infrared heaters expensive to run?
No—they’re 30–50% more efficient than convection heaters. A 1,500W infrared model costs ~$0.18 per hour to run (at $0.12/kWh).
Final Thoughts
Choosing the best heater for an uninsulated garage depends on your needs. Infrared heaters excel in efficiency, propane offers raw power, and electric models ensure safety. For long-term solutions, consider insulating your garage or pairing heaters with radiant floor heating. Stay warm and work smarter!
