HVAC

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Only when it’s very hot and humid out I smell a faint gassy smell from my central air conditioning when it’s running . I only smell it when it’s hot and the ac is running, not when it’s cold and the heat is on . Any ideas of what this smell could be or where it could be coming from?

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Only when it’s very hot and humid out I smell a faint gassy smell from my central air conditioning when it’s running . I only smell it when it’s hot and the ac is running, not when it’s cold and the heat is on . Any ideas of what this smell could be or where it could be coming from?	1