I live in a 3 story townhouse, the lower level is a family room/entrance, main level is the kitchen/dining/family room, and upper level is 3 bedrooms. Each level has its own air return.
The thermostat is set for 71 degrees on the main level. However the lower level is 66, the main level is 71, and the upper level is a toasty 76 degrees, unbearable to sleep in. I have adjusted the dampers to direct 75% of the air flow onto the first 2 levels and we have closed the air vents on half of the upstairs. However, its still a 10 degree difference from top floor to bottom floor.
I had our local heating company do a regular preventative maintenance inspection on our heater and commented on the problem and he suggested covering the air return on the upper floor, which would force the furnace to suck the colder air from the lower level and main floor. He then said to switch it in the summertime and block the air return on the lower floor which would suck in the warmer air from the top and middle floors.
I have the fan for the heating system set on "on" to constantly circulate air throughout the house but we still have a 10 degree difference.
Since there are 3 air returns, would covering the upstairs air return in the winter and then covering the lower floors air return in the summer be a smart thing to do?