Could we create a national HVAC unit?

Do you think that it would be possible to create a national HVAC unit? I think that it would be super cool to create a national HVAC unit. Imagine how cool it would be to never need an HVAC unit in your house again. Imagine if the HVAC unit that controlled the nation could be installed in cities to keep a bubble of perfectly conditioned temperatures all the time. Sure, there would be other areas in the countries where the seasons resumed in order to make plant life and farm life survive, but there would be perfect areas where people could live. I can only imagine how much money that I would save with my HVAC units. I know that everyone has problems with their HVAC units, and that is why we have to pay HVAC technicians a bunch of money in order to fix their HVAC units. If we had a national HVAC unit, then the HVAC technicians could simply work on that one without ever having to come to our house and ruin our schedule and our day. However, now that I think about it, I am not sure that I would save too much money by having a national HVAC unit. I can only imagine how much it would cost to operate an HVAC unit of that size. The HVAC technician would probably have to work like dogs to keep that HVAC unit running, and it would take forever to upgrade and switch out HVAC units if it was possible. I know that the government wouldn’t be paying for that, so it is very likely that the taxpayers would be paying for the HVAC unit. It might even be more expensive.
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