1800sf townhouse, 2 levels, a/c American std condensor 2 ton, 2016, Furnace American Std.
Thermostats target 75F, stuck at 77F for 3 hours now. What can be the primary issue?
BTW, his household energy usage is 209% higher than average. It does not make sense to me. What can be an ease solution. He purchased the TH two year ago and have the issues since then. This is the first time I observe the issue in person. Many thanks!
1800sf townhouse, 2 levels, a/c American std condensor 2 ton, 2016, Furnace American Std.
Thermostats target 75F, stuck at 77F for 3 hours now. What can be the primary issue?
BTW, his household energy usage is 209% higher than average. It does not make sense to me. What can be an ease solution. He purchased the TH two year ago and have the issues since then. This is the first time I observe the issue in person. Many thanks!
s设置室温75F， 停止于77F已有3个小时以上，a/c持续工作。孩子2020年入住，一直由此问题。他的用电量是临近平均值3倍以上。请问主要问题是什么？从哪里着手解决？孩子已经请过3波师傅，没有人真正解决问题。十分感谢！
还有，房子有多旧？比较旧的房子会insulation不够好？冷冻液缺失？
我今天HVAC师傅来看了，我地下室1400尺，我们决定装2.5吨的，因为有一个房间排管子困难，加一个12K瓦的mini split解决问题。
我以前马里兰的房子，insulate非常差，3500尺的房子，冬天最冷的时候我电费是1000多。我现在的房子我用2X6 替代2X4 做墙，车库什么都全部insulate，4500尺的房子，夏天最热也就300多刀，保温性不是一般的好。
如果左右有其他单位，那就是ceiling上面的绝缘。旧的roof设计有问题。出气口太少。我的房子上个owner2003年加建，只有一个Gable vent。两年前一个出租房换屋顶，我看工头给我的照片，屋顶有十二个透气的地方。
如果从来就没有制冷到设定温度，考虑制冷能力不够，原因有这些：
1.机器一开始就选得太小。
2.屋内有大功率的热源。
3.检查隔热层，特别是有阁楼的还要注意通风。
把有温控器的房间门关上（如果可以的话），看看是否能达到设定温度。
https://www.thespruce.com/size-insulation-for-2x4-and-2x6-walls-1821598
一是楼上日晒太多或者insulation不够，二是房子的floorplan不利于空气上下对流。
还有一个可能的原因是地下的管道被老鼠咬了洞，所以制冷不力。 我家房子遇到这情况，换了地下管道后一下子冷了。 然后朋友听说，叫她的朋友也换了管道， 同样效果。