I’ve spent winters working in unheated garages, and I can tell you that cold fingers don’t grip wrenches well and cold muscles make mistakes. A garage heater transforms a seasonal workspace into a year-round shop. But the garage heating market is full of undersized units marketed with optimistic BTU claims and oversized units that’ll run your energy bill through the roof. After testing 12 garage heaters across electric, propane, and natural gas categories over two winters, I’ve identified the seven that actually deliver on their promises.
The critical calculation most people skip: BTU requirements depend on your garage size, insulation level, and target temperature rise. A well-insulated 2-car garage (500 sq ft) in a moderate climate needs approximately 25,000-35,000 BTU. An uninsulated 3-car garage (750 sq ft) in a cold climate might need 60,000-75,000 BTU. I tested each heater in a standard 2-car garage (576 sq ft, R-13 insulated walls, insulated garage door) in Zone 5 climate conditions.
Mr. Heater Big Maxx MHU80 (80,000 BTU Natural Gas)<br />
How We Tested Garage Heaters
Each heater was installed in the same 576 sq ft garage with the door closed. Starting temperature was recorded (ambient outdoor temperature ranged from 15-35°F during testing). I measured time to raise the garage temperature by 40°F (simulating heating from 20°F to a comfortable 60°F), energy consumption during that period, and temperature consistency across the garage (measured at four points: near the heater, center, far wall, and floor level).
Noise was measured at the workbench position (approximately 10 feet from the heater). Safety features were evaluated including tip-over protection, overheat shutoff, oxygen depletion sensors (for combustion heaters), and thermostat accuracy. Operating cost was calculated based on local utility rates for electricity ($0.13/kWh) and natural gas ($1.20/therm).
The 7 Best Garage Heaters
1. Mr. Heater Big Maxx MHU80 — Best Overall
The Big Maxx is a ceiling-mounted, natural gas unit-style heater that delivers 80,000 BTU — enough to heat an insulated 3-car garage or an uninsulated 2-car garage in cold climates. In our 576 sq ft test garage, it raised the temperature 40°F in 22 minutes, which is fast enough that you can fire it up when you walk into the shop and be comfortable before you’ve finished setting up your project.
The unit mounts to the ceiling with included brackets, keeping floor space completely clear — critical in a garage where every square foot of floor matters. The built-in thermostat maintains your set temperature within ±3°F. The power-vent design pushes exhaust through a side-wall vent pipe (included), eliminating the need for a chimney. Operating cost averaged $0.45/hour at full output — roughly a third of equivalent electric heating.
Installation requires a natural gas line to the garage (if you don’t already have one, a plumber typically charges $300-$600 to run a line from the house) and a 120V outlet for the fan and ignition. The unit itself installs in 2-3 hours for someone comfortable with gas connections, or $200-$300 for professional installation.
2. Dr. Infrared Heater DR-988 — Best Electric
If you don’t have natural gas in your garage (or don’t want to deal with gas installation), the Dr. Infrared DR-988 is the best electric option. It delivers 5,600 watts (19,100 BTU) on a 240V circuit, which is enough to heat an insulated 2-car garage to a comfortable working temperature. In our test, it raised the temperature 40°F in 48 minutes — slower than gas heaters but perfectly adequate if you turn it on 30 minutes before you start working.
The industrial design is built for garage environments — metal housing, heavy-duty power cord, and a carrying handle for repositioning. The built-in thermostat and adjustable fan speed let you dial in the heat level. Operating cost is $0.73/hour at full output on a 240V circuit — higher than gas but with zero installation cost beyond the 240V outlet (which most garages already have for a dryer or welder).
3. Heatstar HSU80NG — Best for Large Garages
The Heatstar HSU80NG is a forced-air natural gas heater that pushes 80,000 BTU through a powerful blower, creating rapid, even heating across large spaces. Where the Mr. Heater Big Maxx uses a quieter unit-style design, the Heatstar’s forced-air approach heats faster — 40°F rise in 18 minutes in our test — at the cost of more noise (62 dB). For large garages, workshops, or spaces with high ceilings where heat stratification is a concern, the forced-air design distributes heat more effectively.
The ceiling-mount design with adjustable louvers lets you direct airflow where it’s needed. The electronic ignition eliminates the standing pilot light, saving gas when the heater isn’t actively running. The built-in thermostat is accurate to ±2°F.
4. Mr. Heater Buddy (MH18B) — Best Portable Propane
The Buddy is the go-to portable heater for garages without permanent heating infrastructure. It runs on standard 1-lb propane cylinders (or a 20-lb tank with an adapter hose) and delivers 4,000-18,000 BTU with a simple dial control. No electricity needed — it’s completely self-contained. In our test, the 18,000 BTU setting raised the temperature 40°F in 55 minutes in the insulated 2-car garage.
The Buddy includes an oxygen depletion sensor (ODS) that automatically shuts off the heater if oxygen levels drop below safe thresholds — essential for any combustion heater used in an enclosed space. The tip-over shutoff adds another safety layer. At $100-$130, it’s the most accessible entry point for garage heating.
The limitation is fuel cost and runtime. A 1-lb propane cylinder lasts approximately 1 hour at full output and costs $3-$5. A 20-lb tank ($15-$20 to refill) lasts approximately 10-12 hours at full output. For occasional use, this is fine. For daily use, the fuel cost adds up quickly compared to natural gas or electric.
5. Fahrenheat FUH54 — Best Hardwired Electric
The Fahrenheat FUH54 is a ceiling-mounted, hardwired 240V electric heater that delivers 2,500-5,000 watts (8,500-17,000 BTU). The hardwired installation means no cord to trip over and a clean, permanent setup. The built-in thermostat and two heat settings provide simple, reliable temperature control. The compact design (13.5 x 14.5 x 11 inches) mounts in a corner without consuming usable space.
At $150-$200, it’s priced between portable electric heaters and gas units. Operating cost is similar to the Dr. Infrared ($0.65/hr at full output). The advantage over portable electrics is the permanent, out-of-the-way installation and the reliability of hardwired power. The disadvantage is that installation requires an electrician if you’re not comfortable with 240V wiring ($100-$200 for professional installation).
6. Dyna-Glo RMC-FA60DGD — Best Forced Air Propane
The Dyna-Glo FA60DGD is a torpedo-style forced-air propane heater that blasts 60,000 BTU of heat across the garage. It’s the fastest way to heat a cold garage — 40°F rise in 15 minutes in our test, the fastest of any heater tested. The forced-air design pushes warm air across the entire space, eliminating cold spots. It runs on a standard 20-lb propane tank and includes a 10-foot hose.
The tradeoff is noise (68 dB — like a loud conversation), fuel consumption (approximately 4 hours per 20-lb tank at full output), and the fact that it’s a direct-fire heater — the combustion exhaust enters the garage air. This means ventilation is essential (crack the garage door 2-3 inches or open a window). It’s best suited for heating the garage quickly before switching to a quieter maintenance heater, or for occasional use in very cold conditions.
7. NewAir G73 — Best Budget Electric
At $70-$90, the NewAir G73 is the most affordable way to add heat to a garage. It delivers 5,118 watts (17,000 BTU) on a 240V circuit with a built-in thermostat and adjustable tilt bracket. The stainless steel construction handles garage environments, and the ceiling-mount bracket keeps it off the floor. It heated our test garage 40°F in 52 minutes — comparable to the Dr. Infrared at a lower price.
Build quality reflects the price — the thermostat is less precise (±5°F) and the fan is louder (60 dB) than premium options. But for a garage that’s used occasionally and doesn’t justify a $400+ gas heater installation, the G73 provides adequate heat at minimal cost.
Garage Heater Sizing Guide
The formula: (Garage volume in cubic feet) × (Desired temperature rise in °F) × (Insulation factor) = Required BTU/hour.
Insulation factors: Well-insulated (R-13+ walls, insulated door) = 0.5. Moderately insulated (some insulation, uninsulated door) = 1.0. Uninsulated = 1.5.
Example: 2-car garage (24×24×10 = 5,760 cu ft) × 40°F rise × 0.5 (well-insulated) = 115,200 ÷ 3.41 (BTU conversion) = approximately 33,800 BTU needed. A 35,000-45,000 BTU heater handles this comfortably.
Our Verdict
The Mr. Heater Big Maxx MHU80 is the best garage heater for anyone with natural gas access — it heats fast, runs cheap, and mounts out of the way. For electric-only garages, the Dr. Infrared DR-988 delivers solid performance at a reasonable price. And for garages without permanent heating infrastructure, the Mr. Heater Buddy provides portable, propane-powered heat that works anywhere.