People seem to have missed the point. If you have an exhaust fan that vents out, turn it on when you use your gas appliance.  In temperate times, open your window too.  The combination increases the efficiency with which the gas exhaust is removed.The dilemma is in the cold winter months.  What warm air goes out eventually draws in the equivalent amount of cold air.  This both raises your heating cost and makes your air drier.  It's not a bad idea to a quality electric burner for something you will simmer for hours to avoid running the fan.Another dilemma is the oven.  It's not actually actively burning gas all the time during operation, only in heat up and when necessary to bring the temperature back up to the setting.  I would certainly turn on the exhaust fan as the oven is getting up to operating temperature.  I will turn off the fan when I can see the burners are off.I also try to combine my tasks when the oven is on. So If I know I need to boil water and heat up the oven, I do both at the same time with the exhaust fan on.

People seem to have missed the point. If you have an exhaust fan that vents out, turn it on when you use your gas appliance.  In temperate times, open your window too.  The combination increases the efficiency with which the gas exhaust is removed.The dilemma is in the cold winter months.  What warm air goes out eventually draws in the equivalent amount of cold air.  This both raises your heating cost and makes your air drier.  It's not a bad idea to a quality electric burner for something you will simmer for hours to avoid running the fan.Another dilemma is the oven.  It's not actually actively burning gas all the time during operation, only in heat up and when necessary to bring the temperature back up to the setting.  I would certainly turn on the exhaust fan as the oven is getting up to operating temperature.  I will turn off the fan when I can see the burners are off.I also try to combine my tasks when the oven is on. So If I know I need to boil water and heat up the oven, I do both at the same time with the exhaust fan on.

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