Tech was out due to noise coming from hvac system. Tech checked system and found that reason from noise is due to when they had the ac on , the pvc drain line is connected to the drain in laundry room. So when ac was on customer could hear water dripping and gurgling. Let customer know that this is normal when there is no water in p-trap. Also while checking system tech notice the following. Filter is needing to be changed , wet switch needs to be added in drain pan. Uv light needs to be added into air handler to kill growth and viruses. Blower is needing to be cleaned, if customer decides to go with Uv light and blower cleaning , tech would clean evaporator coil at no charge. Condenser is needing to be chemically cleaned. The bare minimum basic repairs to get the system running today.