Performed furnace diagnostic 14 yr mobile home unit. Furnace has been moved and then someone covered the return air vent. Into the walk in closet. Most of the floor registers are missing in the home. Which is effecting air flow. Main supply duct to side of house in bad shape, sitting on the ground. Furnace appears to have been moved at some point. It’s now in a closet behind the house. Water heater doesn’t have a flue pipe attached, it’s off to the side. Floor under swamp cooler falling apart. See pictures and ceiling in middle of home appears to be leaking. System does work for now, tested and cycled system multiple times ok. But due to age shape and neglect. Might want to replace system. Found unit 29 in bad shape, unit works needs big maintenance. Floor falling apart under swamp cooler.