DEFINITION & TERMINOLOGY. drug use. related: chemical substance use. substance use. not to be confused with: drug misuse. drug abuse. drug use is the proper administration of any chemical substance such that it produces an effect with a desirable outcome.
Most likely itâs the smell of mold and/or mildew. Thatâs bad news because your AC is most likely distributing mold and/or mildew spores throughout your home. Both harmful to your health, especially if you have allergy issues. Letâs go over the sources of the mold/mildew and what you can do to get rid of it.
Negative pressure can cause mold, too much condensation or humidity, stale or musty air, a rush of air when an exterior door is open, or backdrafting of combustion appliances. Closing off supply vents or closing a door can put your HVAC system off balance.