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Welcome, my name is XXXXX XXXXX I will do my best to help you with your issueOne possibility is glycol anti-freeze. It smells sweet and is used in hot water heating and solar hot water systems. Some could have leaked out of the system or could have spilled from an earlier leak that was not cleaned up properly. If you can't localize the smell and the odor is noxious or a real nuisance your best bet would be to contact and environmental air quality specialist. There are many smaller companies in most locales that do environmental testing for Real Estate sales and other small scale situations. They can do more specific testing usually for a moderate fee and they should be able to get to the bottom of this for you.
There's nothing in a typical drywall job that would generate any kind of odor beyond the odor of drying paint which should dissipate in a day or so at most