11 years ago, replace the heatpump with a super super efficient model.
Twas... computer controlled, fully variable fan motors inside and out, muti-displacement scroll compressor.
first problem, everytime there was lightning or power variable, making the power surge, the outside unit threw a code to call a technician. I finally learned to simply go to the outside box and throw the breaker which caused the outside unit to reboot... Always in the middle of the night and when the a/c cut off, I got a nudge in the ribs to get up and fix it. grrrrrrr..
Then 6 months after the 10 year warrantee... the inside variable fan motor quit.... $1000 bucks later... got a/c back.... two months later the outside variable fan motor upchucks... Another grand.... Then during the super super 100 year cold spell at 7 degrees, the aux heat strips croak... $650 bucks and thats fixed. still have a compressor that will go next assuming the new better but very very thin high efficient copper coils dont pin hole due to electrolysis. Would seem that building thin wall copper to make the heat transfer faster, limits the life of the coils to a point that some a/c installers are installing sacrificial zinc donuts around the coils.
Short story, the super high efficiency units many not save you as much after all. They cost a lot more up front, but pay you back every a bit every year.
And the engineers were told to make everything last for 10 years... and boy where these guys good.
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