Is it safe to warm up car in garage with garage door open?

Author: Ayla Murray  |  Last update: Thursday, June 19, 2025

To ensure garage door safety, do not run your car in the garage, even with the door open. At GDI Garage Doors, we know this practice can be dangerous and potentially deadly. Many people don't realize carbon monoxide (CO) buildup can occur in garages even when the garage door is open.

Can I warm up my car in the garage with the door open?

Yes, you can start your car in the garage with the door open. However, it's important to ensure that the garage is well-ventilated, as running the engine can produce carbon monoxide, which is dangerous in enclosed spaces.

Is it bad to start car in garage with door open?

Never warm-up or operate a vehicle in the garage or other enclosed area, even if the garage door is open. Do not start the vehicle until everyone is in the vehicle and vehicle doors closed... If carbon monoxide enters the house, it will be necessary to leave the garage door open after backing out until the CO clears.

How long can I warm up my car in the garage?

Leave the car in gear, hold it with the brake and let it idle for 15 to 30 seconds — depending on how cold it is outside — until you're satisfied it's ready to roll.

Is warming up a car in a garage a bad idea because you could end up with carbon monoxide poisoning?

Warming a car in a garage , even with the garage door open , can still generate carbon monoxide (CO) and other toxic fumes. It is important to understand that running a car engine produces exhaust gases that include carbon monoxide , which is a colorless and odorless gas that can be harmful in high concentrations.

Warming Up Cars in The Garage

Can you get carbon monoxide poisoning with a garage door open?

Most engines put out carbon monoxide, a deadly gas you can't see or smell. A running car can create enough carbon monoxide build-up to kill you, even if the garage door is open. Wind can blow carbon monoxide back into your garage, or even inside your house if doors, windows, or vents are open.

Why you shouldn't warm up your car?

The Environmental Protection Agency also advises against warming up your car, even in the winter, because “unnecessary idling of cars, trucks, and school buses pollutes the air, wastes fuel, and causes excess engine wear.”

Can you idle a car in an open garage?

Never idle a car in a garage, even when the garage door is open. Carbon monoxide can build up so quickly that victims are overcome before they can get help.

Is 10 minutes enough to warm up car?

When the temperature drops during winter, it's a good idea to let your car run for about a minute. Some drivers prefer to let the engine idle for 20 minutes or longer to get everything—including the cabin—really warm, but the fastest way to warm up an engine is by driving.

How long can a car safely run in a garage?

How long before it becomes dangerous. A paper by T.H. Greiner, Ph. D., P.E. states that running a car with a 5-horsepower engine in an enclosed 10,000 cubic foot room becomes fatal after just 7 minutes. 10,000 cubic feet is larger than the average garage, making this problem even more dangerous.

Is it OK to leave car running with garage door open?

To ensure garage door safety, do not run your car in the garage, even with the door open. At GDI Garage Doors, we know this practice can be dangerous and potentially deadly. Many people don't realize carbon monoxide (CO) buildup can occur in garages even when the garage door is open.

How long does it take for carbon monoxide to build up in a house?

Small carbon monoxide leaks can fill every room in your house with poisonous gas within eight hours. Severe leaks can cause this problem in just five minutes. The EPA states that exposure to concentrations of nine ppm or more for eight hours is enough to produce harmful health effects for at-risk individuals.

Can I start my car in a closed garage?

First, never run your car inside your garage, for any reason (never burn anything indoors that isn't properly vented—no cookouts inside your garage, either, for example). Get everybody inside the car and open the garage door before starting the vehicle, then drive out promptly.

Is it safe to start your car in the garage?

Never run your car in the garage, even with the door open. Install carbon monoxide detectors at knee height in your garage, the room next to it, and the rooms above. Always keep extra batteries near your carbon monoxide detectors. Test your carbon monoxide detectors and check the batteries at least once a year.

How to heat a car in the garage?

Another safe way to heat your car in the garage without causing a health hazard is to keep it warm overnight using a block heater or an interior car warmer. You can set the block heater to start heating your car's engine one or two hours before driving out.

Is it better to keep garage door open or closed in hot weather?

If your garage is in direct sunlight, consider keeping the door closed as much as possible. On the other hand, if it is in the shade – let the fresh air in and the heat out! If you are opening the garage door, make sure you are home and not leaving it unattended.

How long should I let my car warm up when it's cold outside?

Henmueller suggested that cars should idle one to two minutes before driving in cold weather. When temperatures drop to freezing, or when it's cold enough that windshields will frost over, the oil needs to warm up before it can move smoothly throughout the car.

How often should I start my car to keep the battery charged?

If most of your car trips are short local rides, try to mix in some longer trips a couple of times a week. This doesn't mean you need to go far. A 20- to 30-minute car ride should be enough to keep your battery at a healthy level.

Is it good to start your car in extreme cold?

One thing some do when the temperatures are cold outside is to start the car and let the engine warm up a few seconds before driving. Several auto experts believe this may not be conducive to preserving the engine.

Is it safe to warm up your car in the garage?

DON'T Warm Up Your Car in a Closed Garage

If you park in a garage, always open the door before turning on your car. Allowing your car to idle in an enclosed space can allow dangerous carbon monoxide to build up. This colorless, odorless gas can poison or even kill you if you inhale too much.

How to clear carbon monoxide from a garage?

Install an exhaust fan, run on a timer, to remove carbon monoxide fumes, and to also lower the pressure in the attached garage. Seal leaks in the shared wall (and ceiling), removing the entry points through which carbon monoxide and other fumes infiltrate the home.

Can I leave my car running in a parking garage?

It is unlikely that an idling car would emit sufficient carbon monoxide to fill a garage in 16 minutes, but in the rare case in which there may be excessive carbon monoxide production, there would typically be symptoms. So, if you are not having any symptoms, you do not need to be seen.

How long can a car sit in cold weather?

When starting your car in cold weather, let it run for at least 30 seconds to a few minutes. This allows the oil to circulate and warm up, which is important for the engine's health and efficiency. How long can a car sit in cold weather? A car can typically sit in cold weather for a few weeks without issues.

Why wont my car start in the cold?

Your car may not start in cold weather because of problems in a number of areas. battery: cold temperatures affect the chemical process inside the battery and reduce its ability to hold a charge. alternator: alternator belts can become cracked in cold temperatures, making it more difficult to power your battery.

Is it bad to start your car with the heater on?

With newer cars, it is not harmful to leave the heater on or your air running while turning your car off and on. It used to be something that could slowly affect the engine over time with added stress on the battery according to Motor How To but we're in different times now.

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