We often hear from Ohio customers who want to understand the risks of carbon monoxide (CO). At Gene’s Refrigeration Heating & Air Conditioning, Plumbing & Electrical, we’re glad to share as much information as possible about protecting your indoor air quality (IAQ)—especially when it comes to the deadly nature of this silent killer.

Carbon monoxide is an odorless gas that is virtually impossible to detect without equipment. Like air, it is invisible and produces no scent. Inhaling enough of it can quickly cause adverse health reactions and even death.

Each year, CO poisoning is responsible for 20,000 emergency room visits, 4,000 hospitalizations, and 400 deaths in the United States, according to the Centers for Disease Control and Prevention (CDC). To promote safety and well-being for our community in Medina, here’s what you should know about this harmful airborne pollutant.

How CO Is Produced

Various substances can create CO gases from burning. Flammable materials like wood, gas, oil, coal, and propane contain carbon. CO molecules are a result of carbon that has only partially combusted.

Know the Risks

CO poisoning is a serious risk. It is toxic to the human body and can be fatal. When it enters the lungs, the bloodstream absorbs it. From there, it begins to displace oxygen, which is vital for the brain, heart, and other key organs to function.

The extent of harm depends on how much CO you inhale and the duration of time you’re exposed. Smaller amounts may produce subtle effects, whereas high concentrations may cause vomiting or fainting.

Leaks in homes tend to be smaller, which means they may go unnoticed. Residents may develop a headache, upset stomach, or feel dizzy. As a result, the poisoning may be mistaken for illness. In industrial settings like a steel mill, CO leaks are often much larger in scale. This can quickly create adverse symptoms and lead to death.

Protect your family from an unnoticed lead. Install a CO alarm in your Medina home.

What Are the Symptoms?

As a general rule of thumb, the more severe the symptoms are, the higher the level of exposure. However, vulnerable groups like small children or the elderly may be more sensitive to lower concentrations of CO.

Milder symptoms include:

  • Headaches
  • Nausea
  • Feeling dizzy
  • Chest pains

More severe symptoms include:

  • Throwing up
  • Breathing difficulties
  • Confusion
  • Blurred vision
  • Loss of consciousness

In addition to higher sensitivity, vulnerable groups are at greater risk of death as a result of exposure. Additionally, being asleep and/or intoxicated is a risk factor since these states of consciousness make it harder for a person to detect symptoms.

How Much Is Too Much?

Inhaling any amount of CO is bad for you. However, healthy adults don’t usually display symptoms at concentrations of 1 to 70 ppm (parts per million), according to the U.S. Consumer Product Safety Commission (CPSC). Still, vulnerable people may begin to display symptoms at this stage.

The real danger zone is past 70 ppm. At 150 to 200 ppm, exposed persons are at risk of muscle failure, confusion, fainting, and death.

How Can I Protect My Home?

Stay diligent and keep your living space CO safe for yourself, your family members, and your pets. By keeping up with a few simple things, you can save lives:

Purchase a carbon monoxide detector for each floor, preferably for each bedroom. Replace the batteries when needed and be sure to test run once a week.

Take the time to read over the instruction manuals for your natural gas appliances. This includes furnaces, stoves, water heaters, and natural gas fireplaces. When you need a repair, always let a professional take care of it. Keep up with seasonal maintenance, as well. Maintenance visits allow a professional to check and fix any CO risk factors.

Never run gas-powered appliances in spaces that aren’t well ventilated. This is a surefire way to create massive amounts of CO.

Never leave your gas stovetop running when you’re not using it. Always double-check that the burners are off when you are done cooking. Do not use your oven to heat your home.

Never leave your car in the garage. Even with the garage door open, it still presents a major risk for CO inhalation.

Need Service?

Gene’s Refrigeration Heating & Air Conditioning, Plumbing & Electrical hopes you found these tips helpful. Our goal, as always, is to help keep all of our neighbors in Medina, OH, stay safe and healthy. If you need service on your home air conditioner or furnace, call us at 330-723-4104 or request service online today.

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Frequently Asked Questions


In colder weather, fuel-burning systems run longer and homes stay closed up more often. That combination can increase the chance of venting issues, pressure imbalances, or blocked exhaust paths. In places like Medina, OH, snow and ice can also create extra venting problems if outdoor terminations get covered.


Yes. Ice buildup, heavy snow drifts, leaves, or even small animal nests can restrict exhaust flow from certain heating appliances. If an exhaust outlet or chimney cap is partially blocked, it can interfere with safe venting. A quick outdoor check after storms and keeping vent terminations clear can help reduce risk.


Backdrafting happens when exhaust gases get pulled back into the home instead of going outdoors. This can occur if the home is under negative pressure, such as when large exhaust fans run or when the house is very tightly sealed. Proper venting, adequate airflow, and correctly sized exhaust systems all play a role in preventing backdraft conditions.


It can. Carbon monoxide can drift through open doors, windows, soffit vents, and fresh-air intakes if equipment is too close to the home. For safer use, keep engines and open-flame cooking well away from the house and never operate them in enclosed or partially enclosed areas like garages, porches, or sheds.


Sometimes. Shared walls, connected attics, and neighboring garages can allow air movement between spaces, especially if there are gaps around ductwork, plumbing penetrations, or utility chases. In multi-family settings, it is smart to report venting concerns quickly and have building management address combustion appliance venting and air sealing where needed.


Standard electric appliances do not produce carbon monoxide because there is no fuel burning. Carbon monoxide is tied to combustion from sources like gas, oil, propane, wood, or gasoline engines. If your home is fully electric, carbon monoxide risk is typically related to attached garages, portable engines, or any fuel-burning equipment brought onto the property.


Problems like restricted venting, a damaged flue connection, incorrect burner setup, or airflow issues can all affect combustion. In some cases, a heat exchanger problem may also be involved. If you ever suspect a combustion or venting issue, it is best to shut the system down and have a qualified technician from Gene’s Refrigeration Heating & Air Conditioning, Plumbing & Electrical inspect the equipment and venting path.

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