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The few homes I've seen loaded by an engineer ,were oversized.Ask if they will be doing a Manual J,or some other method.


I think they error on the side of caution,not being in the business and thinking larger is safer.

No offense to engineers,I'm sure many can do it right,just what I've seen.

 

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Having a two speed/stage compressor with a zoning system that, WILL control the stages, on an as needed basis,would seem to make it more practical,most anywhere.JMHO.

 

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In Florida,the distributor guarantees saving of 25% of your heating and cooling costs,for going from a 10 to a 12 SEER ,or a 12 to a 14 SEER Heat pump.They pay the difference for the first year.The claims I've seen are very few,and we have always found thee was a problem,if they didn't save ,as above.

I'd think the saving would there or very close,if everything is done correctly.If I remember the zones are really too large on the calculator,so they may vary ,a bit within the zone.Can't speak for Gas savings ,if that's in your plans.

The one thing it does is factor in utility price increase ,that may or may not(so far not),occur.