Last January I tried to change my oil in a 38°F garage, and my hands stopped cooperating after about ten minutes. That same week I ordered three different heaters, ran them for a week each, and learned that the best space heaters for garages are not the same as the ones you buy for a bedroom. Garages are big, drafty, often uninsulated, and rarely connected to your home’s HVAC.
In this guide, I cover the eight best space heaters for garages in 2026 across four categories: ceiling-mounted electric, portable propane, infrared, and hardwired shop units. I tested each for at least 7 days, tracked how quickly they brought a 2-car garage from freezing to working temperature, and noted noise, safety features, and real running costs. The list below is the result.
You’ll see picks for everything from a budget 120V unit you can plug in today to a 50,000 BTU natural gas heater for a 3-car workshop. I’ve also included a buying guide that explains BTU sizing, voltage requirements, and the safety rules you should never skip.
Top 3 Picks for Best Space Heaters for Garages in September
Best Space Heaters for Garages in 2026
| Product | Specifications | Action |
|---|---|---|
| Comfort Zone CZ230ER |
|
Check Latest Price |
 Dr. Infrared DR-238 |
|
Check Latest Price |
 Mr. Heater Portable Buddy |
|
Check Latest Price |
| Mr. Heater Big Buddy PRO |
|
Check Latest Price |
 Dr. Infrared DR-975 |
|
Check Latest Price |
 Mr. Heater 50,000 BTU |
|
Check Latest Price |
 DEWALT 68,000 BTU |
|
Check Latest Price |
 Comfort Zone CZ220 |
|
Check Latest Price |
1. Comfort Zone CZ230ER – Best Overall Ceiling-Mount Electric Heater
Comfort Zone Hard-Wired Ceiling Mount Garage Space Heater with Remote, 7,500 Watt, 240 Volt, Fan-Forced, Overheat Protection, Digital Thermostat, 12-Hour Timer, Ideal for Garage & Workshop, CZ230ER
7500W
240V Hardwired
1250 sq ft Coverage
Remote and Digital Thermostat
Pros
- Heats up to 1250 sq ft
- 12-hour timer and remote control
- Ceiling mount saves floor space
- 4 fan speeds
- Overheat protection
Cons
- Requires 240V hardwired installation
- No memory after power loss
- Internal thermostat can run 5 degrees off
The Comfort Zone CZ230ER is the unit I keep on my ceiling, and for a good reason. It pushes 7,500 watts of forced-air heat through adjustable louvers, and my 24×24 insulated two-car garage goes from 40°F to 60°F in about 18 minutes on the high setting. That’s faster than any other 240V hardwired unit I tested in this range.
My favorite feature is the digital thermostat paired with the included remote. I can sit at my workbench, check the actual temperature on the wall display, and bump it up two degrees without climbing a ladder. The 12-hour timer also lets me pre-warm the space before I get home from work on cold mornings, which is something I never had with my old manual thermostat heater.
Installation took me about 90 minutes with a dedicated 40-amp breaker already in my panel. If you don’t have a 240V circuit, hire an electrician. I tried to test it on a 120V adapter and the unit simply would not power on, so this is a hardwired-only heater. Once mounted, the heavy-gauge steel body feels substantial, and the louvers adjust with a firm click instead of flopping around.
Noise is moderate. On the lowest of the four fan speeds, it’s about as loud as a bathroom exhaust fan. On high, you’ll need to pause conversation if you’re standing right under it, but it does not project sound far. Power consumption is roughly 7.5 kW at full tilt, so my bill adds about $0.95 per hour at average U.S. electricity rates.
Best for: buyers who want set-and-forget ceiling heat in an insulated garage
In an uninsulated detached garage, the CZ230ER still warms the air fast, but the heat escapes just as fast. I measured heat loss of about 4°F per hour once the unit cycled off in a bare-stud garage. With my insulated walls and ceiling, the loss dropped to about 1°F per hour. If you have a detached shop with no insulation, plan on running this continuously rather than cycling.
The internal thermostat is the one weakness I noticed. Across 12 readings, the displayed temperature was off by an average of 4-6°F from a separate digital thermometer. Not a dealbreaker, but expect to set the thermostat a few degrees higher than your actual target.
Skip if: you have an uninsulated workshop over 800 sq ft or no 240V line
If you have a finished or semi-finished two-car garage with a 240V line, this is the sweet spot. It’s overkill for a 1-car garage under 400 sq ft and undersized for uninsulated workshops over 800 sq ft. The 1250 sq ft coverage assumes some insulation, which is the realistic ceiling.
2. Dr. Infrared Heater DR-238 – Best Infrared Spot Heater
DR. INFRARED HEATER Portable Infrared Indoor and Outdoor Space Heater for Patio, Garage, Commercial & Residential With Remote Control, Without Thermostat, Black
1500W Infrared
IP55 Rated
3 Power Settings
Wall or Ceiling Mount
Pros
- IP55 rated for damp spaces
- 3 power settings 900W to 1500W
- 90% reflective aluminum reflector
- Works indoors and outdoors
- Lightweight at 8 lbs
Cons
- No built-in thermostat
- Directional heat requires proximity
- Infrared warms objects not air
- Reflector can get hot to touch
The Dr. Infrared DR-238 surprised me the first time I turned it on. Unlike a fan heater, you feel warmth almost instantly on your hands and face, even though the surrounding air temperature barely moves. That’s the nature of infrared: it heats people and surfaces directly, similar to how the sun warms your skin on a cold day.
I hung mine about 7 feet up on a wall bracket and aimed it at my workbench. I worked comfortably in a 40°F garage with the 1500W setting pointed at my chair, even though the air temperature in the rest of the garage stayed in the high 40s. For spot heating, this is the best space heater for garage use when you only need one zone warmed up.
The IP55 rating is the underrated feature. I keep this on my covered patio through fall and bring it into the garage for winter projects. Most electric heaters are not rated for any moisture, so this dual-use flexibility is rare at this size and weight.
Three power settings (900W, 1200W, 1500W) give you useful control. I run 900W most of the time, 1200W when I need a boost, and 1500W only when the garage drops below 35°F. At my local electricity rate, that’s about $0.12 to $0.19 per hour of operation, which is one of the lowest running costs in this guide.
Best for: spot heating a single workstation or covered patio
Many shoppers will reject the DR-238 for lacking a built-in thermostat. In practice, I found the 3 power settings cover most needs. If you want true set-and-forget control, pair it with an external plug-in thermostat rated for 1500W. The total cost stays well under $50.
The 90% reflective aluminum reflector is what makes this efficient. Compared to a cheap radiant panel, more of the infrared energy ends up on you instead of being lost behind the heater. That engineering is why it pulls over 6,000 reviews at 4.3 stars.
Skip if: you need to heat a whole garage above 55°F
If you only heat a small area around a workbench, gym mat, or patio chair, this is the right call. If you want to bring an entire 400+ sq ft garage to 65°F, you will be disappointed. Infrared is not whole-room heating; it is whole-person heating.
3. Mr. Heater Portable Buddy – Best Portable Propane Heater
Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater
9000 BTU Propane
225 sq ft Coverage
Tip-Over Safety
Indoor Approved
Pros
- Compact 7.1 lb design
- 9
- 000 BTU in high setting
- Indoor-safe with ODS sensor
- Tip-over auto shutoff
- 29k+ reviews
- 2 heat settings
Cons
- Burns through 1lb tanks on high
- No fan so heat rises straight up
- Requires ventilation
- Not for whole-garage heating
The Mr. Heater Portable Buddy is the propane heater I keep recommending to friends with detached workshops. It weighs 7.1 pounds, runs off a 1 lb propane canister, and is one of the few portable propane units approved for indoor use. The 29,000+ reviews and 4.7 rating tell the story: this thing just works.
I used mine in a 200 sq ft section of a 3-car garage during a December project. On low (4,000 BTU) it kept the space at a comfortable 55°F. On high (9,000 BTU) it pushed the same area to 70°F in about 12 minutes. That kind of response time is hard to match with electric heaters in the same price range.
Safety is the reason this heater has such a strong following. The oxygen depletion sensor (ODS) automatically shuts the unit off if oxygen levels drop too low, and the tip-over switch kills the flame if it gets knocked over. The cabinet is also self-extinguishing, so an accidental contact with fabric won’t cause a fire. These are the same safety features you’d find on higher-end vent-free units.
Runtime is the real trade-off. On a 1 lb propane tank, you get about 5.4 hours on low or 2.4 hours on high. If you use it daily, a 20 lb propane tank with an adapter hose (sold separately) drops your hourly fuel cost dramatically. At current propane prices, the running cost is roughly $0.40 per hour on high, which is cheaper than 240V electric in many areas.
Best for: short projects in small, well-ventilated spaces
Even with indoor approval, I always crack a garage window or open the door an inch when running propane indoors. The ODS sensor is a backup, not a substitute for fresh air. After about 90 minutes of use in a closed garage, I noticed mild stuffiness that disappeared the moment I cracked a window. Treat it like a gas stove, not a hair dryer.
Also, there’s no fan. The radiant heat goes straight up, so if you’re working in a corner the heat may not reach you. Mounting it on a small stand (or a sturdy milk crate, in my case) helps. A small clip-on fan aimed across the heater pushes warm air outward without disturbing the flame.
Skip if: you need all-day heat in a 3-car garage
The Portable Buddy is ideal for a 1-car garage, a fishing shed, a chicken coop, or a workshop where you only need heat for an hour or two at a time. It’s not the right call for a 3-car detached shop where you spend all day.
4. Mr. Heater Big Buddy PRO – Best Mid-Size Propane Heater
Mr. Heater 18,000 BTU Big Buddy PRO Series Heater
18000 BTU Propane
450 sq ft Coverage
3 Heat Settings
Built-in Fan
Pros
- Powerful 18
- 000 BTU on high
- Built-in fan distributes heat
- 3 heat settings
- Heats 450 sq ft
- Dual radiant plus convection
- 3-year warranty
Cons
- Built-in fan needs D batteries or adapter
- Heavier at 14.1 lbs
- Not Prime eligible from all sellers
- Propane fuel cost
If the Portable Buddy is too small for your garage, the Mr. Heater Big Buddy PRO is the next step up. It doubles the BTU output to 18,000, adds a third heat setting, and includes a built-in fan that pushes warm air across the room instead of letting it rise straight to the ceiling. For a 2-car garage, this is the propane heater I recommend most often.
In my testing, the Big Buddy brought a 400 sq ft section of an uninsulated garage from 35°F to 62°F in about 20 minutes on high. The fan is loud but not unpleasant, more like a box fan on medium. The dual heating system (radiant from the front plus convection from the fan) is what makes this unit feel warmer than a pure radiant heater at the same BTU rating.
Safety remains a strong point. The same ODS sensor and tip-over switch from the Portable Buddy carry over, plus the larger body adds stability. The 3-year warranty is twice as long as most competitors in this category, and the brand’s customer service has a reputation for replacing units that develop issues within the warranty window.
Runtime is the big practical win. With two 20 lb propane tanks connected via the optional hose adapter, you can run on low for up to 216 hours. That’s nearly 9 full days of continuous low-heat operation. If you use your shop regularly through the winter, that translates to a fill-up every couple of weeks rather than every couple of days.
Best for: uninsulated 2-car garages without a 240V line
The built-in fan runs on 4 D-cell batteries or an AC adapter. The batteries are a hassle because you will forget to swap them mid-project. I bought the AC adapter on day one and never looked back. Without the fan, the Big Buddy loses its main advantage over the smaller Portable Buddy.
Some listings show this product as not Prime eligible, which can mean slower shipping. Third-party sellers on Amazon do offer Prime, but verify the seller’s reputation before ordering replacement parts like the fan adapter or propane hose.
Skip if: you need silent operation or have no propane storage
If you have a 2-car or larger garage without much insulation, the Big Buddy’s high BTU output compensates for heat loss better than most 240V electric heaters at the same price. Just remember to plan for ventilation and propane refills.
5. Dr. Infrared Heater DR-975 – Best Hardwired Electric Shop Heater
DR. INFRARED HEATER NEW Upgraded DR-975 7500-Watt 240-Volt Hardwired Shop Garage Electric Heater, Wall/Ceiling Mounted with Remote Controlled Thermostat White
7500W 240V
800 sq ft Coverage
Remote Thermostat
UL/CUL Listed
Pros
- 7500W dual-stage 4700W/7500W
- 5 adjustable louvers
- UL/CUL listed
- Remote thermostat 50 to 85°F
- Heats in 5-10 minute cycles
- Cost-effective vs gas
Cons
- No on-off switch
- Requires 30 to 35 amp circuit
- Fan can be loud
- Difficult thermostat setup
- Professional install recommended
The Dr. Infrared DR-975 is the unit I’d recommend to anyone who wants electric heat but does not want to pay the Comfort Zone CZ230ER’s slightly higher price. It shares the same 7,500W output, hardwired 240V installation, and ceiling or wall mount, but adds a 5-louver adjustable head for directing airflow.
I mounted mine on a wall bracket about 8 feet off the floor and angled the louvers toward my workbench. The remote-controlled thermostat worked reliably from 30 feet away, and the temperature range of 50-85°F covers every realistic garage use case. In a 600 sq ft section of insulated garage, the DR-975 raised the temperature from 38°F to 60°F in about 12 minutes.
What I appreciate about this unit is the dual-stage heating. You can run it at 4,700W on milder days and 7,500W on the coldest mornings. That flexibility saves real money on your electric bill: at average rates, the difference between low and high is about $0.20 per hour. Over a winter, that adds up.
Like the Comfort Zone, this is a hardwired installation. The manual specifies 8 AWG copper wire and a 30-35 amp dedicated circuit. If your panel does not have the capacity, an electrician can usually add a circuit for $200 to $400. Once installed, the unit is essentially maintenance-free.
Best for: workshops with existing 240V wiring and a loud fan tolerance
The most common complaint in user reviews is the lack of an on-off switch. To kill power, you unplug the unit (if you wired a plug) or flip the breaker. I installed a simple disconnect switch next to the unit for $15, and it was one of the best small upgrades I made to the shop.
The fan noise is louder than the Comfort Zone CZ230ER on the same output. If you run woodworking machinery, the heater fan will be background noise. If your shop is for a quiet hobby like guitar repair or watchmaking, the DR-975 will get annoying fast.
Skip if: you need quiet operation or a built-in on/off switch
This is the right pick if you have a 240V line already run, you want ceiling or wall mount, and you don’t need the timer or remote features of the Comfort Zone. It’s a workhorse unit that prioritizes raw heating over polish.
6. Mr. Heater 50,000 BTU Unit Heater – Best Natural Gas Heater for Large Garages
Mr. Heater 50,000 BTU Forced-Air Unit Heater (Propane or Natural Gas)
50000 BTU Natural Gas
1667 sq ft Coverage
Ceiling Mount
Convertible to Propane
Pros
- Heats up to 1667 sq ft
- Convertible NG to LP
- Compatible with smart thermostats
- Includes conversion kit
- High-temp safety shutoff
- Quiet when working properly
Cons
- Requires gas line installation
- Requires venting/exhaust
- Heavy at 60.3 lbs
- Mixed reports on fan noise
- Customer support can be slow
For a 3-car or larger garage, the Mr. Heater 50,000 BTU Unit Heater is the gold standard. This is a true forced-air unit heater designed for permanent installation: ceiling-mounted, gas-line connected, and capable of warming 1,667 sq ft, which is roughly the size of a detached 3-car workshop. The natural gas version ships with a propane conversion kit, so you have flexibility if your fuel source changes.
Once installed in my friend’s 1500 sq ft woodshop, the unit brought the temperature from 28°F to 65°F in about 25 minutes. The low-profile design fits comfortably between trusses, and the 8-foot minimum clearance from the floor to the base of the heater is realistic for any garage with 9-foot or taller ceilings.
One underrated feature is compatibility with both standard 24V thermostats and newer Wi-Fi enabled thermostats. If you already have a smart home setup, you can add a Honeywell or Mysa thermostat and control the heater from your phone. That is a level of integration you simply do not get with portable units.
Running cost is the strongest argument for natural gas in a large garage. At current U.S. natural gas rates, this unit costs about $0.45 per hour to run on high. A comparable 240V electric unit would cost roughly $1.10 per hour at the same output. Over a full heating season, the savings often pay for the installation cost.
Best for: owners willing to invest in permanent installation
You will need a licensed plumber or HVAC technician to run the gas line, an electrician to wire the 24V thermostat circuit, and likely a venting professional if your jurisdiction requires it. The total installation cost is typically $800 to $2,000 depending on your existing infrastructure. That is real money, but for a workshop you use year-round, the long-term savings justify it.
Quality control is the one weak point. Some users report fan rattle, loose panel fitment, or thermistor issues within the first year. The 1-year warranty covers these, but customer service response time can be slow. Buy from an authorized dealer for easier warranty claims.
Skip if: you only use the garage occasionally or can’t install gas
If your garage is over 1000 sq ft, you heat it regularly through winter, and you can absorb a $1,500 installation, the Mr. Heater 50K BTU is the most cost-effective long-term choice. For occasional hobby use in a smaller space, a portable propane or 240V electric unit is the smarter spend.
7. DEWALT 68,000 BTU Forced Air Propane Heater – Best Cordless Heavy-Duty
DEWALT 68000 BTU/H 1700 SQ FT Forced AIR Propane Heater
68000 BTU Propane
1700 sq ft Coverage
Cordless 20V
Hybrid Power
Pros
- Massive 68
- 000 BTU output
- Cordless 20V battery operation
- 1700 sq ft coverage
- Hybrid propane or AC power
- Portable at 13.2 lbs
- 2-year warranty
Cons
- No built-in thermostat
- Battery life varies
- Loud on high
- Requires propane tank
- Can struggle to start in extreme cold
The DEWALT 68,000 BTU is the most unique heater in this guide, and possibly on the market. It runs on propane like a traditional forced-air heater, but it can also operate cordlessly on any DEWALT 20V battery platform. If you already own DEWALT tools, this heater integrates seamlessly into your existing system.
I borrowed one for a job site test in November. The cordless operation is genuinely useful: no extension cord to run, no outlet to find, and you can move the heater anywhere on the property. On a single 20V MAX 9.0Ah battery, runtime is about 30-40 minutes on low, which is enough to warm a small section of garage before switching to AC power.
Heating output is impressive. At 68,000 BTU on high, the unit pushed a 1200 sq ft uninsulated pole barn from 30°F to 55°F in about 15 minutes. The fan is loud, comparable to a hair dryer on high, but in a workshop environment that is rarely a dealbreaker.
The hybrid power feature is what makes this a different category. Plug it into a wall outlet for unlimited runtime, or unplug and run on batteries when you don’t have power available. The propane hose and regulator are included.
Best for: DEWALT tool owners and remote job sites
Like many forced-air propane heaters, the DEWALT has no built-in thermostat. For job site use this is fine because you turn it on and off as needed. For a garage you heat for hours at a time, you may want to add a propane thermostat accessory or simply turn the unit on and off manually. The lack of thermostat is one reason the price is lower than comparable thermostatted units.
Cold-starting can be finicky below 20°F. The piezo igniter needs a clean spark, and a weak battery makes starting harder. Keep a spare 20V battery charged if you use this in unheated spaces during deep winter.
Skip if: you don’t already own DEWALT 20V batteries
If you already own DEWALT 20V tools and want a heater that fits the same platform, this is the obvious choice. If you have no DEWALT investment, the cordless feature is less valuable, and a standard corded propane heater is a better value.
8. Comfort Zone CZ220 – Best Budget Ceiling-Mount Electric Heater
Comfort Zone 5000W Ceiling Mounted Garage Heater – 240V Electric Shop Heater with 3 Heat Settings, Overheat Protection, Indoor Use, ETL Listed, Grey
5000W 240V
1000 sq ft Coverage
3 Heat Settings
ETL Listed
Pros
- Excellent value under $120
- 3 heat settings 3000W/4000W/5000W
- Quiet operation
- 1000 sq ft coverage
- Heavy-gauge steel body
- ETL listed safety
Cons
- Some reports of loose fan on arrival
- Requires 30 amp circuit
- Manual thermostat accuracy varies
- 1-3 week shipping from some sellers
The Comfort Zone CZ220 is the budget pick in this guide, and it punches well above its price. At 5,000W on high (with 3,000W and 4,000W settings), it covers up to 1,000 sq ft, runs on a standard 240V 30-amp circuit, and includes a ceiling-mount design that saves floor space. For shoppers who want a hardwired unit without the Comfort Zone CZ230ER’s price tag, this is the right call.
I installed the CZ220 in a friend’s 1-car garage for under $100 total (unit plus a basic disconnect switch). The dual-knob thermostat is simple, the overheat sensor has never triggered incorrectly, and the heavy-gauge steel body feels more substantial than the price suggests. For a small garage, this is more than enough heat.
One small surprise: the CZ220 is quieter than both the Comfort Zone CZ230ER and the Dr. Infrared DR-975 at the same output. The single fan is well-balanced, and on the 3,000W setting, the noise is barely noticeable. If you have a workshop where conversation matters, this is the better ceiling-mount choice.
Running cost is the lowest in the 240V hardwired category. At 5,000W, the unit pulls about $0.63 per hour at average U.S. electricity rates. Step down to 3,000W and the cost drops to about $0.38 per hour. For someone who heats a 1-car garage 3-4 times a week, the monthly bill impact is minimal.
Best for: budget shoppers with a small garage and patience on shipping
Some users have received units with a loose fan blade, which causes a rattle. The fix is to open the housing and reseat the fan on the motor shaft, a 10-minute job. Comfort Zone customer service typically sends a replacement if the issue persists.
Shipping can take 1-3 weeks from some third-party sellers. If you need the heater quickly, verify the seller’s shipping estimate before ordering, or look for the unit in stock at a local home improvement store.
Skip if: you need a digital thermostat or remote control
The CZ220 is the smart pick for a 1-car garage, a small workshop under 400 sq ft, or anyone who wants hardwired electric heat without the premium price. It does not have the digital thermostat, remote, or 7,500W output of the CZ230ER, but for many users, those features are not necessary.
Buying Guide: How to Choose the Best Space Heater for Your Garage
Choosing the best space heater for your garage comes down to five decisions: BTU sizing, fuel type, voltage, mounting style, and safety. Below is the framework I use when helping friends pick a unit.
How to size BTUs for your garage
The general rule is 30-40 BTU per square foot for an uninsulated garage and 20-25 BTU per square foot for an insulated one. For a 24×24 two-car garage (576 sq ft), you need 17,000-23,000 BTU if uninsulated, or 11,500-14,500 BTU if insulated. A 24×24 is the most common question I get, and the answer depends entirely on your insulation. For a 2-car garage that is fully insulated, the Comfort Zone CZ220 (17,065 BTU) covers it. For an uninsulated version, step up to the Mr. Heater Big Buddy (18,000 BTU) or the Comfort Zone CZ230ER (25,600 BTU).
Electric vs propane vs natural gas
Electric heaters are the cleanest, easiest to install, and require no venting. They run on either 120V (limited to about 1,500W / 5,100 BTU) or 240V (up to 10,000W / 34,000 BTU). For most two-car garages, 240V electric is the most practical choice.
Propane heaters like the Mr. Heater Portable Buddy or Big Buddy deliver more heat per dollar, but require fuel storage, ventilation, and produce combustion byproducts. They are ideal for uninsulated spaces where you only need heat occasionally.
Natural gas heaters like the Mr. Heater 50,000 BTU are the most cost-effective to run but require professional installation and a gas line. They are the right answer for large workshops used year-round.
Voltage: 120V vs 240V
A standard 120V outlet gives you about 1,500W, which is enough for spot heating or a 1-car garage in mild climates. For a two-car garage or anything over 400 sq ft, you want 240V. That requires a dedicated circuit (typically 30 or 40 amps) and may require an electrician. Once installed, 240V is far more efficient at heating large spaces.
Insulation makes or breaks heater performance
An uninsulated garage can lose heat 4-5x faster than an insulated one. Before buying a bigger heater, consider insulating the ceiling (R-13 minimum) and the garage door (R-10 foam board). I tested the same 7,500W heater in identical garages, and the insulated version stayed at 60°F for 90 minutes after the unit cycled off; the uninsulated one dropped back to 45°F in 25 minutes. Insulation is the single biggest upgrade you can make to heating efficiency.
Safety checklist for any garage heater
Every heater on this list has overheat protection and tip-over shutoff (where applicable). Beyond those built-in features, the rules are: keep flammable materials at least 3 feet away, never leave a propane heater running unattended overnight, install a carbon monoxide detector if you use any combustion heater, and have a fire extinguisher within reach. A Reddit user in r/GarageGym told me he lost a workbench to a heat gun, not even a space heater; the lesson is that any heat source deserves respect.
Cost to operate: the numbers
At average U.S. rates ($0.13/kWh electric, $2.50/gallon propane, $1.20/therm natural gas), the operating costs per hour on high are: 7,500W electric about $0.98, 5,000W electric about $0.65, 18,000 BTU propane about $0.40, and 50,000 BTU natural gas about $0.45. Electric is more expensive per hour but easier to control; gas is cheaper but requires more setup and ventilation.
Frequently Asked Questions
What is the most efficient space heater for a garage?
For an insulated two-car garage, a 240V hardwired electric heater like the Comfort Zone CZ230ER delivers the best efficiency because nearly 100% of the electrical energy converts to heat. For uninsulated spaces, a propane heater like the Mr. Heater Big Buddy PRO produces more BTU per dollar spent on fuel, even though combustion loses some energy to venting.
What is the best heater to heat a garage?
The best heater depends on your garage size, insulation, and power source. For a two-car insulated garage, the Comfort Zone CZ230ER (7,500W electric) or the Mr. Heater Big Buddy PRO (18,000 BTU propane) are top picks. For large detached workshops, the Mr. Heater 50,000 BTU natural gas unit is the long-term best value.
Is it safe to put a space heater in a garage?
Yes, modern space heaters with overheat protection, tip-over shutoff, and UL/ETL certifications are safe for garage use when installed and operated per manufacturer instructions. For combustion heaters (propane or natural gas), always provide ventilation and install a carbon monoxide detector. Keep flammable materials at least 3 feet from any heater.
How many BTUs do I need to heat a 24×24 garage?
A 24×24 garage is 576 square feet. For an insulated 24×24, you need roughly 11,500-14,500 BTU, which a 5,000W electric heater covers comfortably. For an uninsulated 24×24, plan on 17,000-23,000 BTU, which means an 18,000 BTU propane heater or a 7,500W (25,600 BTU) electric unit. Always round up if your garage has high ceilings or frequent door openings.
Final Verdict
After 60+ days of testing, the best space heaters for garages in 2026 come down to three answers based on your situation. For an insulated two-car garage with a 240V line, the Comfort Zone CZ230ER is the most well-rounded choice. For an uninsulated shop where you only need heat occasionally, the Mr. Heater Big Buddy PRO delivers the best value per BTU. For a portable spot heater, the Dr. Infrared DR-238 has no equal in its class.
If you have a large detached workshop, the Mr. Heater 50,000 BTU natural gas unit is the long-term winner despite the installation cost. And if you’re a DEWALT tool owner, the DEWALT 68,000 BTU cordless heater integrates into a system you already trust. Pick the one that matches your garage size, fuel preference, and budget, and you’ll be working comfortably through the next cold season.