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  1. Thanks for your information.

    But now 2 systems are not possible because the home is almost done.
    Does the 2 stage will save eletricity a lot? like 20~30%?
  2. pstu, thank you so much for your answer!

    Your answers are always so helpful.
    Do you mean the 2 stage can save eletricity a lot? and also more comfortable?
    Is there any design that only offer 2 stage A/C, but not 2 stage furnance?
    or just...
  3. What's the advantage of a 2 speed (2 stage) HVAC?

    We planed to buy a 3300 sqft 2 story new home. Right now it only has a 5 ton unit AC with 2 zones, and we are worrying about the efficiency because we saw most of the new homes around that size have...
  4. Thank you for the answer. I hope they will do the...

    Thank you for the answer. I hope they will do the right job.
    My wife is considering to return this house because of the one unit.
    It looks we are over-react to it.
  5. Thanks a lot for all these professional answers!...

    Thanks a lot for all these professional answers! I really appreciate that.
    I live in Houston. I only know the the system will have two zones (downstair and upstair), and the brand is Lennox. I don't...
  6. Only one 5 ton AC unit with 2 zones in a 2-story 3300 sqft new house, please help!

    First of all, I want to say this is a great forum. The information here is really helpful to me.

    We just bought a new 3300 sqft 2-story house from David Weekley.
    And recently we found out they...
  7. Thanks a lot for your answer! It is 2-zone...

    Thanks a lot for your answer!
    It is 2-zone system. Is that very popular to use 2-zone AC for such a size house? (~3300 sqft)? It's my first time to buy a house. I just feel not confident with the 1...
  8. Only one 5 ton AC unit in a 2-story 3300 sqft new house, please help!

    We just bought a new 3300 sqft 2-story house from David Weekley.
    And recently we found out they are using only one AC unit (5 tons) for the house. We feel really suprise becasuse we saw most of new...
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