The difference between modern and aged air conditioning systems and heating systems is immense and is worth talking about. When I was a kid, I enjoyed learning about the early stages of technology, recognizably in the world of Heating plus A/C. I l gained about the first window air conditioning system that was made from only a few weird parts. Then I l gained about the wood furnace that was immense in its morning. After that I l gained about central air conditioning systems and gas, oil, and electric furnaces. A little later media air cleaners became a big deal and every heating and cooling company wanted to get them on their shelves. I enjoyed learning about all of these things, but now that I am older, I enjoy laboring on air conditioning system units and heating systems and building them myself. I also work as an Heating plus A/C serviceman on the side for extra currency. All this to say, I suppose a lot about both modern and aged Heating plus A/C units, and I wanted to take a minute to compare them, and many people guess that technology has advanced so much over the years that an aged air conditioning system or furnace would be ununique to the modern eye. This simply is not true. The truth is, aged window air conditioning systems were structured much love modern window air conditioning systems, just with straight-forwardr internal parts. Old window air conditioning systems did not, however, have any air filters which does make a big difference in how well they work. Back in the morning, central air conditioning systems were not particularly heard of except for in some of the more wealthy homes. Back then, commercial air conditioning systems were more of what various normal households have as their central air conditioning systems.