Fire safety experts and consumer protection agencies, including the Consumer Product Safety Commission, strongly advise against leaving a space heater on all night. The risk of a fast-moving fire occurring while you are asleep is significant, as you may not wake up in time to react to danger.
It is not safe to leave a space heater on all night. Fire safety experts universally advise against running them unattended, as you cannot control hazards while sleeping. Common dangers include a high risk of fires, overheating outlets, and carbon monoxide buildup from faulty fuel-burning units.
For safety reasons, you should never run a space heater continuously without supervision, and never leave one on while you are sleeping. Portable heaters are designed to operate safely for short periods of 4 to 8 hours maximum.
Most indoor heaters tend to dry out the air, lowering indoor humidity levels. Dry air can cause irritation to the respiratory tract, leading to symptoms like dry throat, cough, and nasal congestion. For individuals with chronic respiratory diseases like asthma or COPD, low humidity can exacerbate symptoms.
Running a space heater overnight increases the risk of fire. If the unit is left unattended or placed too close to flammable materials, such as curtains or bedding, it can ignite and lead to a devastating fire.
The Risk of Space Heater Fires
One third of fires in the home are caused by space heaters.
Cooking is the leading cause of house fires in the United States. According to NFPA research on home cooking fires, cooking-related incidents account for the largest share of residential fires and injuries. Unattended cooking is the most common contributing factor.
For individuals with COPD, temperatures below freezing (32°F / 0°C) are considered too cold and can trigger severe flare-ups, chest tightness, and shortness of breath. Even temperatures dropping below 40°F (4.4°C) can cause the dry, chilled air to irritate overly sensitive airways.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
A COPD flare-up (exacerbation) is triggered by increased airway inflammation, most commonly from respiratory infections (viruses/bacteria), exposure to air pollutants, smoke, and extreme weather. These incidents cause a sudden worsening of symptoms—such as increased coughing, wheezing, and breathlessness—lasting two or more days.
It is not safe to run a space heater overnight. If you use an electric or propane space heater during the day, make sure to protect yourself and your home by following all safety practices. Use space heaters that automatically turn off if they tip over.
The cost of your energy: On average gas in November 2024, is currently 6.4p per kW/hr. Electricity is 24.5p per kW/hr. For this comparison, we are not including oil central heating.
Portable Space Heaters Can pose a serious fire risk if left unattended. Always make sure to turn them off when leaving the room or going to sleep. Following these safety tips can help prevent winter fires and keep your home safe and warm.
Recommended Usage Times
At Night: If you choose to use your space heater overnight, it's best to limit its operation to 4 to 6 hours on a lower setting.
Electric heaters of any type are unsafe to leave running overnight because they carry a significant amount of risk. If a space heater falls over or becomes too hot from running for too long of a period of time, that can lead to a fast-moving fire that occurs while you are asleep and cannot act fast enough.
It only takes seconds for a fire to start if a space heater tips over or comes in contact with something combustible, like a blanket or curtains. If you're using a space heater, switch it off before leaving the room.
In most homes, Heating and Cooling (HVAC) systems drive the highest energy costs, accounting for nearly 40% to 50% of your total electricity bill. Following these, the appliances that run up your bill the most include water heaters, refrigerators, and laundry machines.
Heating and energy expert Stephen Hankinson said that one "big energy cost saver" is to make sure you have your heating off when you're not at home. For instance, if you typically arrive home from work at around 6pm on weekdays, you could set your heating to activate just as you walk through the door.
For most customers, we recommend turning on your furnace when the weather is consistently below 18° Celsius, which usually happens to be around the end of September, or early October. Some homeowners try to put off turning on their furnace as long as they can to save money, which is okay if you're healthy adults.
Cigarette smoking is the major cause of lung cancer and chronic obstructive pulmonary disease (COPD), which includes chronic bronchitis and emphysema. Cigarette smoke can narrow the air passages and make breathing more difficult.
One of the first and most common signs of Chronic Obstructive Pulmonary Disease (COPD) is a persistent, long-term cough, often referred to as a "smoker's cough".
This is because: Cold air can cause your airways to narrow. This can increase the amount of mucus you produce and make it harder to breathe. Cold, dry air can also irritate your airways and make symptoms like wheezing, coughing and breathlessness worse.
Where are home fires most likely to start? Home fires are more likely to start in the kitchen than any other room in the home.
Fire Beetles
Some beetles love fire! They arrive in large numbers at forest fires so that they can lay their eggs on the burnt trees or soil. Some travel over 50 miles to reach the fire. They have even been seen crawling inside the protective suits of firefighters and biting them!
Whilst they can start naturally, see Information note - Wildfire, it is estimated that 90% of all wildfires across the globe are caused by humans. About 30% of those are started as a deliberate act of arson, whilst 70% are started accidentally or as a direct result of human carelessness.