Cleanliness is next to Godliness. Everyone knows this. This is especially true of your home and its surroundings, especially when you have young children and pets. If you have a HVAC system installed in your house, the comfort it offers comes with certain responsibilities. You have to have the system cleaned and the filter replaced regularly. An annual inspection is also better so that any problems are nipped in the bud. You also have to get the air ducts cleaned to ensure that any harmful substances like germs or mold spores do not enter your home and harm your family.
Your HVAC system is forced air with many components like intake openings, outflow vents, filters, grills, air-ducts that facilitate movement of air throughout your home, diffusers, heating coils and cooling elements, condensate drains or drip pans, fan motor and its housing. You have to get the entire system periodically maintained and fix whatever needs fixing, particularly before it gets cold. During winters, in extremely cold climates, even if you find mold or dampness, getting the service person or the cleaner to come and clean your ducts might be difficult as it is the peak season. So, it is better to have it serviced and cleaned before the onset of winter.