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Chemical odor coming from ventilation system

\015 Chemical odor comes and goes. This same thing happened last spring. I had my duct system cleaned and have had numerous furnace repairmen check unit but to no avail. I have checked under my crawl space and have not found anything dead or any water or sewage leaks.WEbought this house three years ago and this is the secound year that we have had this problem. Could this possibly be a problem caused by a termite or insecticide problem'\015

Answers :

I do belive I would some research to see if I could find out if there was dirt haul in from a chemical plant or close to one where run off surface water.If you can't find anything out you may try find what type order it is.Do you think it smells like freon?

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Chemical odor coming from ventilation system


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