七年的空调，5 ton, 外机有块有很多电容的板，换一下需要七千。我没见过世面，大吃一惊，七千都能换个整机了，结果人家说这是Carrier最高端的产品线，variable speed, 声音轻, 省电。
我去查了一下，variable speed底下是2stage, 然后才是single stage. 省电划不划算的我没算过，但是这台机的内机在attic比较靠近孩子的卧室的位置，安静还是有用的。所以variable speed和2 stage/ single stage比真的安静很多吗？如果换整个外机可行吗？
Variable speed is quieter. It is not difficult to change PCB yourself if you could order one from Carrier.
https://www.griffithenergyservices.com/articles/single-stage-dual-stage-variable-speed-acs-whats-the-difference#:~:text=All%20three%20options%20can%20operate,as%20low%20as%2055%20decibels.
insulation from furnace to your room so the difference may not be that high.
七年的空调，5 ton, 外机有块有很多电容的板，换一下需要七千。我没见过世面，大吃一惊，七千都能换个整机了，结果人家说这是Carrier最高端的产品线，variable speed, 声音轻, 省电。
我去查了一下，variable speed底下是2stage, 然后才是single stage. 省电划不划算的我没算过，但是这台机的内机在attic比较靠近孩子的卧室的位置，安静还是有用的。所以variable speed和2 stage/ single stage比真的安静很多吗？如果换整个外机可行吗？
Variable speed is quieter. It is not difficult to change PCB yourself if you could order one from Carrier.
https://www.griffithenergyservices.com/articles/single-stage-dual-stage-variable-speed-acs-whats-the-difference#:~:text=All%20three%20options%20can%20operate,as%20low%20as%2055%20decibels.
insulation from furnace to your room so the difference may not be that high.