I have a problem with my air flow - I have to turn the temp. on the thremostat all the way up or all the way down to to get the house cool or heated. Even with that, I do not feel a strong breeze coming from any of my vents in the ceiling. I have an upstairs unit and a downstairs unit and both give me the same problem. Is it a problem with my blower/motor, do I need dampers, or or some type of an upgrade
