Usually no. If your air conditioner is running constantly and the room is not cooling to the set temperature you should check several things. First check the temperature of the air entering the air conditioner. Then check the temperature of the air blowing out of the air conditioner. The difference in temperature should be no less than 15 degrees. If the unit cannot cool the air traveling through it by 15 degrees or more it may have a problem that can be corrected. If the unit has a difference of more than 15 degrees it is probably working properly. If the unit is cooling properly the room might be too big for the unit's capacity (see the section named "What size unit do I need for my room").