As a matter of fact, the egyptian HVAC units were even more advanced than our current HVAC units
I am an ex cooling expert who gave up my career as an HVAC technician to study archeology. I was recently excavating an egyptian site when I found HVAC units way before their time. I found some intricate air duct systems that lead to what looked like a central air conditioner. It didn’t make sense that there were central air conditioning units in ancient egypt. We finally figured out that there were aliens that had come and given the instructions for the central air conditioner to the pharaoh. They also gave them some portable space heaters as well as a few mini air conditioners. The more that we dug, the more HVAC units we found. It was amazing to find window air conditioners, air purifiers, and furnaces all over this small ancient egyptian city. We didn’t know that whole story, but from what we could find, there were aliens who came and dropped off several heating and cooling devices, as well as delivering some instructions on how to build certain units like air conditioners, furnaces, and air purifiers. These HVAC units, however, were not built the same way we build our air conditioners and furnaces today. As a matter of fact, the egyptian HVAC units were even more advanced than our current HVAC units. We did some more research and soon were on a trail to find out about alien heating and cooling units. While we have no way of contacting these aliens, we know so much more about window air conditioners, furnaces and many other HVAC units that the aliens made.