| Sounds you have air flow problem. As you mentioned, you can not even feel the air from the unstair vents. This is definitely a problem. you will have to check the duct that carry the air to those rooms to see if they are blocked, or they are simply too small. Second, check the air temperature that come out the downstair vent (check the one with strongest air flow), to see if the air temperature is at least 15 degree lower than your room temperature at that time. If you have at least 15 degree difference there, then your A/C unit is probably OK.
Also, don't close too many vents, that will restrict the total air flow which will damage your fan and cause A/C freeze. Good luck. |