Maybe. Maybe not. There are a number of possible conditions that can keep an air conditioner from working efficiently. Low refrigerant is just one possibility. Others include a faulty cooling fan, a misadjusted blend door, or a clogged condenser to name just a few.
Some of these conditions are very easy to correct and won’t take a lot of time or money to fix. The best way to be sure is to bring your car to your local Cottman center. Their technicians will be able to check your car’s A/C system and make any adjustments or repairs to get it working like new again.