What this means is that it is not going to be able to cool your house the same way it could have when it was clean.
Many cooling and heating companies that are in the market today are able to offer customers with preventive and low-priced maintenance service contracts. These contracts may end up costing you around $70 to a total of $100. Once you get this kind of service, then your air conditioning system is going to be serviced and cleaned including your HVAC unit. Your filters are also going to be checked, cleaned and replaced if necessary. There are those companies that tend to offer discounts to their clients if they sign up for an annual plan.