does the depend on how many vents and the type of ductwork you have, and accessibility to HVAC system and the number of floors in the home..
or you have not changed the in considerable amount of time, it may be time to clean the ducts.
You should also call specialist to investigate why there is mold growth in the air ducts, as this can be sign of larger problem...
your home has been the victim of flood or fire, or there are air quality issues, you may need to clean your air ducts..
Using the brush and vacuum, clean the length of the ductwork loosening and removing the debris inside..
You may need to remove the ducting from the furnace to gain access vacuum and clean the ductwork leading from the furnace as applicable..
you can walk around with the hired professional to make sure all the areas were cleaned.
While it's near impossible to state which company is Houston, for locals to the area, it's advised that they check with Networx to find reputable company that has been reviewed and vetted.
You can search NADCA database for local companies in Denver area that specialize in air duct cleaning.
You can search NADCA database for local companies in Las Vegas area that specialize in air duct cleaning.
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