Every month I perform some minor maintenance chores on the Heating plus Air Conditioning program in my home, however performing these Shores actually helps increase the longevity of the machine, but a well cared for Heating plus Air Conditioning program May last twice as long as one that has never been touched. I used to contact a repair maintenance to perform the tune ups, however now I handle most of the work on my own. Each month I clean the drain line with a solution of warm water plus detergent. Each month I change the air filter plus clean all of the evaporator coils. The last time I took the a/c apart to clean the system, I ended up losing one of the screws. I looked all over the garage for the screw, however I could not find it somewhere. It was as if it disappeared into thin air. The other several screws were standing in the same locale where I left them, however the eighth was missing. I recently l gained the location of the 4th a/c screw. I decided to clean out my dog’s water bowl plus food dish. When I cleared away all of the food, I noticed something shiny standing in the corner of the bowl. I did not believe that the shiny object was going to be the screw from the Heating plus Air Conditioning unit. I guess my dog picked up the screw plus carried it to his food bowl. I’m glad he was smart enough to realize that the screw wasn’t food. It could have been dangerous if he would have swallowed the screw. It could have been cottaged in his stomach plus required surgery to detach.