Thanks for your stories...it helps a lot to know from you all whose opinions I really value. It does not blow hard out of any register or make any sound at all. We had them set the temp on 76, because dh freezes to death when I am cool. And so far, its cool inside; enough to sleep well at night. We put in two fifty gallon water heaters...so guests can take long showers....like DD.
The trane they installed when building the new house was a cheap model, only backed by warranty for five years and it was costing us big $$$$ to keep it running eight/nine years later. Not installed right, it was leaking air/heat into the attic.
May you all have a good day. Thanks again to all who shared their experiences.