Most home owners are likely to brush aside the fact that they notice a decline with their air conditioning system's performance. This isn't a good idea because waiting for it to ultimately stop working because if it comes to that point, the expenses in terms of repair and other technical services will incur quite a hefty amount. In addition to this, regular maintenance and check-up will extend the life of your air conditioning system.
On the other hand, deterioration in performance is not something that goes unnoticed. For people who have been accustomed to a certain range of number in their thermostat, an increase in temperature would be apparent. If the decline in performance is consistent and the unit doesn't revert to its regular function after a few days, it's a good idea to call for the services of a certified technician. You need to know that the problem may be as simple as the air filter being blanketed with dust, or as complicated as refrigerants leaking out of the system. Whichever the case may be, it's important to leave the repair or maintenance to the experts, especially if the air conditioning system is a newer model. Newer ones tend to require more specific care to check, dismantle and repair.