理论上,一封闭空间无AIR RETURN,HEAT REGISTER的热空气无法进入,因该房间 BECOME A DEAD END,DISPLACEMENT OF COLD AIR WON'T TAKE PLACE, THE AIR HAS NO WAY TO GO 故也,但每个房间总有空隙,例如门下有缝,冷气自会流向附近之AIR RETURN,问题不太大,如果该房距FURNACE较远,冬天时或会冰冷点。一般来说,BEDROOMS,KITCHEN,FAMILYROOM 等必有AIR RETURN;WALK-IN,BATHROOM多数无。卖房事也不需太担心,验房师并不是你想象般严谨,如果仍不放心,事情总有解决办法,我可就我所知,CASE BY CASE 作建议. Anyway, if your house is new and still under the builder's warranty, try talk to them about it, it can still be done, possibly.