I recently switched from radiator heat to a forced air system. I am not getting a strong enough air flow to heat or cool the second floor. As a result I must keep my window air conditioners and now I must go buy electrical heat for the upstair bedrooms. Does anyone know how to fix this situation?

They have these new heaters that are small and heat rooms better than a furnace.

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Everybody I know that has them say they cost VERY little to run and 65 gets one room really warm and the unit doesn't heat up so kids/pets won't get burned.