Performed ac diagnostic Folsom. Found 23 yr old system low on refrigerant again. Coil partially frozen. We need to de ice system, so that we can properly charge system. Need to charge system and weigh in refrigerant. R22 is 200$ a lb. so very costly. Also would need to properly clean ac condenser. Recommend repair vs replace options, due age of system, shape of system and the amount of money we have put into system this year alone. Ken to come out this evening and go over options.