Are you sure this is the right spot for the air vent?

I had a modern Heating, Ventilation, plus A/C idea being installed in the house, however i wanted modern air duct along with the furnace plus air conditioning, but until recently, I didn’t have central air conditioning, plus I was finally going to get rid of the old window air conditioning units.

I would finally have a heating idea that I didn’t need to go downstairs to turn on plus turn off. I had a modern temperature control that would allow me to check the status of the Heating, Ventilation, plus A/C system, even if I wasn’t in the house, then when I got cabin a single day, I noticed the air vents were near the ceiling. I wasn’t sure this looked right, so I called the Heating, Ventilation, plus A/C contractor. I asked if they were sure the air vents were in the right locale, they told me it was best to put the air vents up high, however since cold air falls, the air conditioning would fall to the floor plus not stay on the floor. This would provide me cool air throughout the house, plus not just in come locales. They said there was a fan inside each air vent that would push the air out across the room. This sounded good for the summer, but what about the winter? Heat rises. I was sad the heat would stay at ceiling level. I wanted to believe why there weren’t several air vents? There should be a single in the floor for the heat, plus a single in the upper section of the wall for the air conditioning; He asked if I understood how much this would cost. I knew what I had already put into the Heating, Ventilation, plus A/C system, plus I would not quibble over a few extra hundred dollars.
heating provider