So the mechanics of all that ducting is important. Every elbow, division or change in size in the ductwork creates resistance to air flow - and any change in any part of the system effects all the other parts of the system simply because they are sharing the flow from one single source fan in the Furnace. That air flow is divided amongst all of the output grills in the house, and how it gets there can make a difference. The fan from a forced air furnace puts out a specific quantity of air. Although such problems may require repositioning ductwork, or adding booster fans - the first thing to check is that the ductwork is balanced and balanced differently for the two different seasons.
Some rooms are colder than others, or a forced air system works well for heating but not air conditioning.
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