Is it normal to have to add freon every year?
No, this indicates that you have a freon leak. The leak affects the efficiency of your air conditioning system as well as adversely effects the environment. Also, a leak will cause your air conditioner to prematurely wear out. This condition can also cause your system to “ice up”, which can cause water damage to property and compressor damage. You should have a service technician check this problem and find the leak with electronic leak detection equipment.