You need to have someone come out to determine the source of the CO (you do mean carbon monoxide, right? Not carbon dioxide)
A quick Google search shows that CO buildup in houses are usually from:
Heating system/ Household appliances
gas fires, boilers, central heating systems, water heaters, cookers, and open fires that use gas, oil, coal, and wood — may be possible sources of CO gas. Due to poor maintenance, ventilation, or other technical faults, they may produce the gas.
Unvented Space Heaters
An unvented space heater uses combustible fuel and indoor air for the heating process. It vents the gases it makes into the room, instead of outdoors.
Attached Garages
Exhaust from vehicles running in the garage are not able to vent outside if the garage door is closed prematurely or people run the car to warm it up with the garage door down
If you track the source and fix it, you won't have to bar your windows. What keeps other people out also prevents you from getting out if there is a fire.
ravenrhi t1_j2njo18 wrote
Reply to Something is causing CO2 buildup in part of the house- how do I secure the windows so I can ventilate it? by [deleted]
You need to have someone come out to determine the source of the CO (you do mean carbon monoxide, right? Not carbon dioxide)
A quick Google search shows that CO buildup in houses are usually from:
Heating system/ Household appliances gas fires, boilers, central heating systems, water heaters, cookers, and open fires that use gas, oil, coal, and wood — may be possible sources of CO gas. Due to poor maintenance, ventilation, or other technical faults, they may produce the gas.
Unvented Space Heaters An unvented space heater uses combustible fuel and indoor air for the heating process. It vents the gases it makes into the room, instead of outdoors.
Attached Garages Exhaust from vehicles running in the garage are not able to vent outside if the garage door is closed prematurely or people run the car to warm it up with the garage door down
If you track the source and fix it, you won't have to bar your windows. What keeps other people out also prevents you from getting out if there is a fire.
Here is an article that might help https://www.cdc.gov/co/faqs.htm
Good luck!