Winter in Vancouver means relying on your furnace to keep your home warm and cozy. But if you notice feeling nauseous, dizzy, or experiencing headaches when your furnace is on, it’s not just uncomfortable—it could be a sign of a serious issue.
1. Check for Carbon Monoxide (CO) Exposure
One of the most dangerous causes of nausea when a furnace is running is carbon monoxide. CO is a colorless, odorless gas produced by incomplete combustion in gas furnaces. Symptoms of CO exposure include:
Nausea or vomiting
Dizziness or lightheadedness
Headaches
Fatigue
Immediate action: If you suspect carbon monoxide, leave your home immediately and call emergency services. Ensure your home has working CO detectors on every level, especially near bedrooms.
2. Poor Air Quality and Dust
If your furnace hasn’t been cleaned or maintained regularly, dust, mold spores, and other allergens can circulate in your home when it’s running. This can lead to:
Nausea or queasiness
Sneezing or coughing
Eye irritation
Replacing your furnace filters regularly (every 1–3 months) and having ducts cleaned can significantly improve indoor air quality.
3. Gas Leaks
Natural gas furnaces can occasionally develop leaks, which may also cause nausea, headaches, or dizziness. A faint “rotten egg” smell is a common warning sign. If you ever smell gas, leave your home immediately and contact your gas provider or a certified HVAC technician.
4. Poor Ventilation
Homes that are tightly sealed for energy efficiency can sometimes trap indoor pollutants, leading to nausea or headaches when the furnace runs. Ensuring proper ventilation or using an air exchanger can improve airflow and reduce discomfort.
5. Take Action Before Symptoms Worsen
Regular furnace maintenance is key to preventing health risks and keeping your home comfortable. A certified HVAC technician can:
Inspect and service your furnace for safety and efficiency
Test for carbon monoxide and gas leaks
Replace or clean filters and vents
Ensure proper ventilation throughout your home