Arrived at the home due to the system is not heating correctly. Arrived at the home and started looking at the system. The customer stated the system and home had been sitting unoccupied for 2 years. Started looking at the system and noticed mice had chewed up multiple wires so new thermostat wire would have to be ran. Also noticed blower wheel was completely caked with debris and also acorns. The transformer was also blown and will need to be replaced before any further repairs can happen. I spoke with the customer about getting a senior technician out to go over options before we start putting money towards repair due to the condition and overall shape of the system.