I have an issue with that

I was in the hospital recently, to visit a friend.  She had been put in the hospital because she had pneumonia.  I was absolutely anxious about her because I had recently been to visit her.  When I arrived, she was cocooned in blankets from chin to toe. She told myself and others she was so cold so was shivering.  I thought the room was quite comfortable & I was anxious that she was still running a temperature. Fifteen minutes later, she threw the blankets off while complaining that it was now too warm.  I had recently taken my coat off, & I didn’t notice a sizable difference, although I did notice that I was now deliciously warm. I moved over by the window, where her bed was, & I could know the heat of the sun coming through the window.  I could know the heat coming off the heater. It was so hot & dry that it made my eyes water. Now I could understand why it was so warm for her. Two minutes later, the heating system turned off & there was a cool air that was coming from the heater.  You could know the Wintertide cold coming off the windows. I immediately lowered the blinds & closed the curtains. My friend wanted to see the outside, however the cold coming from the heating system & off the windows, was outrageous. Two minutes later, the heating system turned back on, only to make the room too hot again.  She told myself and others that there had been a problem with the heating system since she came. Even though she had said something to the nurses, so far, nothing had been done to rectify the heating system problem.

HVAC ductwork