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  1. Replies
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    Hacking Carrier Greenspeed Wifi Thermostat?

    I've got the 5-ton Carrier Greenspeed HeatPump (and love it) and just recently got the WiFi version of the thermostat installed.

    One thing I've been longing to do (since I'm an engineer :D) is to...
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    I don't think THAT'S true. But, due to the...

    I don't think THAT'S true.

    But, due to the nature of the show, I wouldn't expect to see many episodes where everything was done right so he WOULD be praising the contractors.

    I will say,...
  3. Other than new construction, what's the point of...

    Other than new construction, what's the point of installing everything else first?

    I guess as long as you don't already have a working system, there's not much harm.
  4. Nice analysis. Where'd you get that info? ...

    Nice analysis.

    Where'd you get that info?

    I'd like to compare Houston (where I moved from) to Dallas (where I moved to) to Oklahoma City (where I'm from).
  5. I agree with him. And ask how many people...

    I agree with him.

    And ask how many people would like to get rid of their AC altogether. That'd sure reduce the utility bill. :D
  6. All I can say is I can't wait to try out this...

    All I can say is I can't wait to try out this system once my new house is done!
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    No, he's referring to insulating (spray foam) the...

    No, he's referring to insulating (spray foam) the roof deck, rather than insulating the ceiling.

    This results in the attic being in the (semi)conditioned zone.
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    I'd love to have that "problem". If your...

    I'd love to have that "problem".

    If your system is set to "Comfort" or "Dehumid", you might try setting it to "Efficiency" or "Maxmum" to see if that helps.

    That should turn off the abiilty of...
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    In a perfect world, I'd keep it at 40%. My...

    In a perfect world, I'd keep it at 40%. My guitars and piano are happiest there, as I am.
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    Any geothermal system work like this?

    Most contractors tell me that they have to drill one 200-300' vertical well for every ton of AC/heat (plus an additional well, according to at least half).

    They all seem to sell a dual-stage...
  11. We keep the blinds closed almost all the time. ...

    We keep the blinds closed almost all the time. (Sorry, no drapes).

    I'm getting them to run that sensitivity for me.
  12. Not very likely to happen at this point. The...

    Not very likely to happen at this point. The main thing would be to go after windows. I've got about 450 sq ft of windows. But I'd be crazy to reduce it (unless we go back to the 60's in terms of...
  13. That would be great, as long as they don't mind...

    That would be great, as long as they don't mind talking to an end-user.
  14. Designing each zone to handle the minimum 700 CFM...

    Designing each zone to handle the minimum 700 CFM doesn't really bother me (extra cost, that is . . . if it's required to make it work better), but I do have a concern (perhaps unfounded?) that...
  15. Care to clarify a bit? The 700 CFM is correct...

    Care to clarify a bit?

    The 700 CFM is correct (check the specs). At its lowest setting, the 5-ton unit will put out only 2-tons of AC and requires 700 CFM. (Sames goes for the 4-ton).
  16. Well, I know that's not true, simply because my...

    Well, I know that's not true, simply because my brother has a system like this (Infinity) and doesn't have every zone big enough to handle the minimum load. The Infinity will look for zones that are...
  17. The builder uses vinyl dual-pane windows with...

    The builder uses vinyl dual-pane windows with 270-LowE and Argon. According to the manufacturer's website, the U-value is 0.29 and the SGHC is 0.26, visible transmissibility is 50%.

    I could...
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    Poll: Here's why I think that statement isn't true: ...

    Here's why I think that statement isn't true: the loads are calculated at extreme conditions assuming semi-steady state conditions, when in fact the loads are a dynamic condition.

    That is, your...
  19. The breakdown of the Manual-J loads shows that...

    The breakdown of the Manual-J loads shows that half the load is coming from windows. So, to get down to 3 tons, I'd have to seriously reduce the amount of windows in the house.

    Couldn't do...
  20. 4100 SF on the lower floor, 1000 on the upper...

    4100 SF on the lower floor, 1000 on the upper floor.

    And, yeah . . . very big rooms. I guess I'm a bit claustrophobic. :D

    The last two houses I've had built, I always have one less room (two...
  21. I'd be extremely surprised to see that zoning...

    I'd be extremely surprised to see that zoning could result in more than a 40% reduction in required load. Especially considering the results (so far) of this poll:
    ...
  22. Can latent capacity be used as sensible capacity?

    Let's assume that a cooling system at design temperature has a total cooling capacity of 49 kBTUH and a sensible cooling capacity of 36 kBTUH, leaving a latent cooling capacity of 13 kBTUH.

    I've...
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    Poll: My bad . . shoulda put a 0% option in there.

    My bad . . shoulda put a 0% option in there.
  24. Replies
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    Poll: How much does zoning reduce the loads?

    How much are you (as a contractor) willing to reduce your Manual-J load calculations if the house is going to use zoning? Assume more than just the typical 2 zones (up/down). Let's assume say 3 or...
  25. I understand your comments, but after looking at...

    I understand your comments, but after looking at the data for this new product, it seems to me that your concerns won't be as valid for this unit (going from 5 to 4 tons) as it would be for a typical...
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