Came out today to perform one system HVAC full inspection. Upon arrival, customer stated that the system was not working and heat mode. Upon inspection of the system, found that the filter was completely clogged, the blower wheel had buildup, the flood protection for the system is not TE standard because it is not a water sensor, Voutdoor condenser coil had build up with leaves and debris, the ductwork is also very dirty, there is no UV protection on the system. Upon replacing the filter and testing the system, found all operations of the system working properly at this time. With the old filter, the system could not breathe, causing the system to go out on high pressure. At this time, customer is reviewing estimates and will reach back out after Christmas.