Any odors are a sign of excess moisture for an extended period of time. Plastic on the earth, dehumidification in all of the interior space including the living space.
Avoid infiltrating outside air during the times of vacancy and dew points above 50^F. Checkout the Santa Fe line of dehumidifiers. <50%RH when the space is unoccupied is critical to control mold and rot.
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"