If your cooling system is working but cold air is not blown out through the vent then the problem might be with the air filters. For fixing the problem you will have to check the air filters and clean or replace it if it is clogged. An air filter traps the dust particles circulating within the room and filters the air hence it is obvious that with time it will be filled with a lot of impurities which makes it clear that it needs to be cleaned on a regular basis. An air conditioner working with a clogged air filter will make the unit function under a lot of stress which will eventually tamper the unit and affects its durability. Ignoring such simple aspects is going to cost you a lot of money. Keeping the air circulating in your home clean is also very important. With a dirty air filter the cool air circulating within your home is not going to be clean in fact the air is going to get more polluted.
Cleaning the filters are necessary to keep the air safe and clean inside your house. Problems like allergy, skin disorder etc. can be prevented by keeping the air filters clean. People are only concerned about the pollution that is happening outside. Have you ever wondered how much safe it is to breathe inside your house? Most of the allergy attacks are acquired from your own home so to keep these allergies and other impurities at bay you need to clean or replace the air filters on a regular basis.