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My opinion will be a bit jaded...I have been a Trane dealer...and also have installed the Daiken.
Service, ease of parts and knowledge to repair all goes to Trane.
Daiken is not bad but is not as service friendly as the Trane. Lose a compressor on a Trane and it is available likely same day. Daikin is more of a challange.
Daiken allows for better dealer profit.....it cost less to the dealer than a Trane and you can mark it up more for a better profit margin.
Now the biggest factor....You can have good equipment but a poor install....the contractor and installation is critical. Since you plan on leaving in 3-4 years the 10 year labor is not a big sell point...
The contractor that appears to be more skilled...and the contractor that runs a manual J calculation for size is the best way to go.....I would side with Trane if the dealers are equally competent
In northern states no.....in your area YES. Look at it as having 2 different ac units...one when it is hot,,,and another to kick on when it is really hot. The savings is big on this in your area.....you only run a portion of ac when needed saving on engaging the entire system.
I am believer in the 2 speed in southern states...yes it is worth the extra