Garage Heater Guide: Electric, Gas, Infrared and Sizing

A garage heater turns a cold, unused space into a place where you can work on projects, train or tinker all winter. The right choice depends on how big the garage is, how well it is insulated, how often you use it and which fuels you have. Choosing well also means thinking carefully about safety, because heaters and garages full of fuel, solvents and dust need respect.

Last reviewed and updated: October 2, 2026. Written by Jeremy Jarvis.

This guide compares the main types of garage heater, explains sizing and installation costs, and covers carbon monoxide and fire safety. Before buying anything, run your garage through the free Garage Heater Size Calculator, which estimates heat loss from your walls, ceiling and door.

Start with how you use the garage

In short, how you use the garage shapes the best heater. If you spend an hour or two on weekend projects, you want heat quickly and only while you are there. By contrast, if the garage is a daily workshop or gym, you want steady, efficient heat for many hours.

Consider the space too, since size matters. A small, attached and insulated garage needs far less heat than a large, detached, drafty one. Fuel matters as well; for example, some homes have natural gas nearby, while others rely on electricity or propane. Finally, think about what else is in the garage. Paint, solvents, fuel and sawdust change which heaters are safe and where they can go.

Types of garage heater

Broadly, garage heaters fall into a few main groups. HomeGuide’s installation cost data gives a useful price picture for each.

HomeGuide puts the overall average cost to install a garage heater at $400 to $2,000. The best choice balances that upfront cost against how much you will run the heater.

Electric garage heaters

Of all the options, electric heaters are the simplest. They produce no combustion gases, need no venting and mount on a wall or ceiling. Most permanent units run on a dedicated 240-volt circuit installed by an electrician. HomeGuide lists electric garage heaters at $400 to $1,200 with installation.

However, HomeGuide notes that electric heaters are best for smaller spaces needing occasional heat, as they can be more expensive to operate. In other words, they are ideal for a weekend workshop, but running one all day in a large garage can add up. Our electric garage heater guide covers sizing, circuits and running costs in depth.

Infrared garage heaters

Infrared heaters, however, work differently from heaters that warm the air. HomeGuide explains that an infrared heater heats objects and surfaces directly using infrared radiation instead of warming the air. That makes them particularly effective in garages with open doors or drafts.

HomeGuide lists infrared heaters at $400 to $800. They are a strong choice above a workbench or in a garage where the door opens often, because the warmth reaches you even as cold air comes in. On the other hand, heat is directional, so areas outside the heater’s aim stay cooler. Mount them according to the maker’s clearance instructions, since the surfaces they face get warm.

Propane and natural gas heaters

In contrast, gas heaters suit larger garages and frequent use. HomeGuide puts a propane garage wall heater at $500 to $1,400 with installation and says it offers a balance between cost and efficiency. It is more expensive to buy than an electric heater but can be more cost-effective to operate.

Natural gas heaters cost $500 to $2,000 or more installed, according to HomeGuide, which calls them the most expensive option to install. A natural gas heater requires a gas line connection, which adds to the overall expense. Where a gas line is nearby, though, running costs can be attractive.

Above all, venting is essential. Vented or direct-vent units carry combustion gases outside through a flue. Installation should be done by a qualified professional, to code, with the clearances the maker specifies. Also, garages with fuel, solvents or finishing work need special attention to where any flame or ignition source sits.

Portable heaters

Meanwhile, portable heaters are the cheapest way to take the chill off. HomeGuide lists them at $50 to $200 and describes them as ideal for small, temporary heating needs. They can be powered by electricity, propane or kerosene.

However, portable heaters carry more fire risk. The U.S. Fire Administration reports that home portable heater fires were only 3% of all home heating fires annually for 2017-2019, but they accounted for 41% of fatal heating fires in homes. Therefore, treat them as a short-term tool, never leave them running unattended and keep them well away from anything that can burn.

Sizing a garage heater properly

An undersized heater runs constantly without warming the space, while an oversized one wastes money. Rules of thumb based only on square feet can be far off, because insulation, ceiling height, the door and the climate matter just as much.

Instead, a better approach is to estimate heat loss. Heat escapes through the walls, ceiling and garage door, and with air that leaks in around the door and openings. The colder the outside temperature you design for, the more heat you need. The Garage Heater Size Calculator adds these losses on a cold day and converts the total to BTU per hour, watts and the approximate amperage for electric heaters.

Once you have that number, compare it with heater ratings. Choose a unit that meets the load with a modest margin, rather than the largest model available.

Insulate before you heat

In many cases, insulation is the most cost-effective heating upgrade. An uninsulated garage loses heat quickly through its walls, ceiling and door, so any heater has to work much harder. Insulating first lets you buy a smaller heater and spend less to run it.

First, start with the biggest losses. The garage door is often the largest uninsulated surface, and worn seals let cold air pour in. Then insulate walls and the ceiling, especially if there is living space above. Our garage insulation guide and insulated garage door guide explain those projects in detail.

Carbon monoxide: the hidden danger

Importantly, any heater that burns fuel produces carbon monoxide. EPA notes that deadly levels of carbon monoxide can quickly build up in enclosed areas and can linger for hours. It stresses that combustion equipment must be maintained and properly adjusted, and that the proper fuel must be used in kerosene space heaters.

Garages also add another source: cars. EPA’s guidance is direct: do not idle the car inside the garage. In addition, the CPSC recommends that every home have carbon monoxide alarms on each level outside each sleeping area. If your garage is attached, consider an alarm in the room next to it as well.

Never use unvented fuel heaters, grills or generators in a closed garage. Vented heaters must have intact, clear flues, and annual inspection by a professional is wise.

Fire safety around heaters

Garages often hold the very things that make heaters dangerous: fuel cans, paint, solvents, rags, cardboard and sawdust. The U.S. Fire Administration advises keeping anything that can burn at least 3 feet from all heat sources, including space heaters. It also advises turning space heaters off when leaving the room or going to bed.

Apply those rules strictly in the garage. Store flammable liquids in closed containers away from the heater, keep the area around it clear and sweep up sawdust regularly. In addition, the U.S. Fire Administration recommends having heating equipment cleaned and inspected each year by a professional. That is especially important for gas units.

Running costs and comfort

Ultimately, running cost depends on how long the heater runs, the fuel price and how well the garage holds heat. Electric heaters are simple to install but, as HomeGuide notes, can be more expensive to operate. Gas heaters cost more to install but can be cheaper to run in heavily used garages.

A thermostat also helps control cost. Set it to the lowest temperature that is comfortable for your activity, since working on a project often needs less heat than sitting still. In addition, preheat only when you plan to use the garage, and close the door promptly after cars come and go.

Choosing a gas garage heater

A gas garage heater makes the most sense when you heat a large garage for long hours, or when electricity is expensive where you live. Before choosing one, decide between propane and natural gas. Natural gas needs a gas line, so it is most practical where a line already runs near the garage. Propane works anywhere, but you need a tank and regular deliveries or refills.

Next, choose the venting style. Many permanent gas garage heater models are vented or direct-vent units that draw combustion air from outside and send exhaust out through a flue. As a result, they keep combustion gases out of the garage. Unit heaters that hang from the ceiling are common in workshops, while low-profile wall units suit smaller garages.

Finally, plan installation with a qualified gas professional. They will size the gas line, place the heater with the right clearances and check local code, including any rules about heaters in garages where vehicles and fuel are stored.

Heat pumps and mini splits

For garages used year-round, a ductless mini split heat pump is another option. It provides both heating and cooling from one system. ENERGY STAR notes that certified mini splits use up to 60% less energy than standard home electric radiators, because they move heat rather than generate it.

Mini splits cost more up front than most garage heaters, but they make sense for a garage gym, office or workshop that needs comfort in summer too. Our garage air conditioner guide compares mini splits with other cooling options.

Garage heater checklist

• Decide how often and how long you will heat the garage.
• Insulate and seal the garage before sizing a heater.
• Estimate heat loss with the Garage Heater Size Calculator.
• Choose electric, infrared, propane, natural gas or a mini split.
• Use a licensed electrician or gas professional for installation.
• Keep anything that can burn at least 3 feet away.
• Install carbon monoxide alarms and never idle cars inside.
• Have heating equipment inspected each year.

Where to compare garage heaters

Once you know the size and fuel you need, compare current electric garage heaters, infrared garage heaters and carbon monoxide alarms. Check heat output, voltage and clearance requirements on each listing. For more comfort guides, visit the Garage Heating, Cooling and Insulation hub.

Frequently asked questions about garage heaters

What is the best way to heat a garage?

For occasional use in a small or medium garage, a hardwired electric heater is simple and clean. For large or frequently used garages, a vented propane or natural gas heater often costs less to run. Infrared heaters suit drafty garages because they warm objects rather than air.

How much does it cost to install a garage heater?

HomeGuide lists garage heater installation at $400 to $2,000. Electric heaters range from $400 to $1,200 installed, propane wall heaters $500 to $1,400, natural gas heaters $500 to $2,000 or more, and infrared heaters $400 to $800.

What size heater do I need for my garage?

The right size depends on the garage’s area, ceiling height, insulation, door and climate. Rules of thumb can be far off, so estimate heat loss through the walls, ceiling and door instead. The Garage Heater Size Calculator does this from your own measurements.

Is it safe to use a propane heater in a garage?

Only if it is designed and installed for that use, with the venting and clearances the maker requires. Combustion heaters produce carbon monoxide, and the CPSC recommends carbon monoxide alarms on each level outside each sleeping area. Never run unvented fuel heaters in a closed garage.

Are portable heaters safe in a garage?

They carry more risk. The U.S. Fire Administration reports home portable heater fires were only 3% of all home heating fires annually for 2017-2019, but they accounted for 41% of fatal heating fires in homes. Keep anything that can burn 3 feet away and turn heaters off when you leave.

Sources and how we researched this guide

This guide is research-based. We did not test heaters for this article; we compared heater types and used HomeGuide’s garage heater installation cost data, U.S. Fire Administration heating fire guidance and EPA carbon monoxide guidance. Gas heaters must be installed and vented to code by qualified professionals. Found something out of date? Tell us and we will check it against the source.

• HomeGuide: Garage heater installation cost
• U.S. Fire Administration: Heating fire safety
• EPA: Carbon monoxide’s impact on indoor air quality
• ENERGY STAR: Ductless heating and cooling

Keep planning

• Garage Insulation: Walls, Ceiling, Door, Costs and R-Values
• Standard Garage Door Sizes: Single, Double and How to Measure
• How to Insulate a Garage Door: Kits, Steps and Costs
• Garage Ventilation Fan: Types, Sizing and Placement Guide

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