Our house has two rooms that are perpetually opposite in temperature for each season. The one room is too hot in the summer and too cold in the winter. The other one is too cold in the summer and too hot in the winter. Something needed balanced out, and I could not figure out what it was. I tried adjusting the vents as the seasons changed, but I could not get it right. I called a place that provides HVAC services in NYC to come out and fix the problem. Our heating and air conditioning system was over 30 years old, and we had been saving for an upgrade for a couple of years now.
The company we hired that provides HVAC service in NYC came out and installed a new furnace and central AC system. They made it a zoned system that would automatically adjust airflow in the summer and winter to the two problem rooms as well as other areas of the house. All we had to do is adjust the extra thermostats in the two big rooms once and forget it, and the HVAC system would take care of the rest. Now the rooms are comfortable year round. Neither one of them get too hot or too cold no matter what time of year it is now.
The zone HVAC system uses dampers that are opened and closed to control airflow throughout the house. It prevents heating or cooling comfortable areas when only only one room may need a temperature adjustment. The entire house is now much more comfortable with the new zone HVAC system we had installed. We are no longer opening some doors and closing others and trying to use fans to move air into or out of the uncomfortable rooms. And I have not had to adjust a vent at all since the new system was installed.