Hello again, ball bearings last longer than sleeve bearings which wear out on average in 7 to 10 years. Ball bearing motors can last about twice as long.
Regarding modulating and communicating systems, if you are wealthy and want your house at exactly the temperature set at all times, and with very precise control of humidity, and do not like any blower noise, then you need the Trane high end system or an equal.
If most residential AC systems that you have experienced are not too noisy for you, and you can suffer 1 or 2 degree F temperature excursions, then you can spend about half as much money on a much more basic system, such as Goodmans low cost range of systems, and about 400% less on repairs for the life of the system. You will spend between 15 and 30% more in electricity to run the lower priced system however.... the money you save can easily be spend keeping the very complex high end trane systems running... its a bit of a push in that regard.
Summary: None of these systems are an 'investment' they wear out, at 10 years they are quite old, you will need a new system in the 15 year range or less... for that reason I prefer lower first cost.
If I were a multi millionaire I would buy the Trane system for its sound and humidity control benefits... I might buy two of those systems, so that if one breaks I would not have to sweat a lot until Trane can send out a rocket scientist to fix it.
I like steam humidifiers best, ***** ***** makes decent humidifiers that are less expensive and work well.
You need Tranes proprietary thermostats for best performance... those are two or three times more expensive than the generic models by others on the market however.
Automatic humidifier is the way to go wired to be controlled by Tranes high end thermostat so that the furnace and AC unit can work in tandem year round to provide humidity control.
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