Customer states that there is uneven air flow throughout the home. Found that animals have got under the house and shredded most of the ducting and insulation under the home. Customer also states that the breaker is on the electric furnace keeps tripping. Technician found very loose connections at the breaker panel and at the furnace. Tightened all connections. System is 12 years old and had some heavy corrosion on the coil however a leak in as not detected. Heat strips are pulling proper amperage. Comfort advisor is scheduled to meet with the customer tomorrow morning.