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  1. #66
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295
    COOLING DEGREE DAYS .. CDD
    REFERENCE:

    Vero Beach _____3,278 CDD
    West Palm Beach 3,891 CDD

    http://www.climate-zone.com/climate/...da/vero-beach/

    http://www.climate-zone.com/climate/...st-palm-beach/
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  2. #67
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,729
    Thanks Dan, very cool of you to do that.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  3. #68
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,295
    Quote Originally Posted by tedkidd View Post
    Thanks Dan, very cool of you to do that.
    I'll accept the Writings of FLORIDA JOY as a teaching moment for her.

    It's great to have a REAL Situation to refine Energy Saving$ and Payback calc methodologies.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  4. #69
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,729
    Good point,

    Thanks Joy for all the risks you took, and all you've shared with us. It has been incredibly informative and helpful!

    The lady gives back in spades.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  5. #70
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by tedkidd View Post
    Thanks Joy for all the risks you took, and all you've shared with us. It has been incredibly informative and helpful!
    Thanks to all of you in this forum who provided input during the decision-making process! I had hoped for closer to $600 in annual savings, but I didn't foresee having my Grandson living with me, which has increased my electrical usage quite a bit since he came here in June. I'm hoping he goes into the Army by the end of the year so usage gets back to "normal" with only one occupant!

  6. #71
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,729
    I lived with my grandmother for 3-4 years. Was one of the greatest experiences of my life. We became very close. it was a great gift.

    Hope you don't regret it being over too quickly.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  7. #72
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    Someone on this thread should post the average temps for the past three years.
    Always here

  8. #73
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,729
    Correlation-causation fallacy?


    What base temperature do you use for hdd & cdd? Been my anecdotal (less than scientifically significant) experience every house has a different base. Be careful here.


    I guess you are right, should normalize to weather. But I'd keep non normalized results on the same page. I'm not comfortable that normalization doesn't sometimes take result and skew them if you aren't careful.


    I like big timeframes, they flatten out anomalies. The longer you go, the less you have to worry about variations in behavior or weather.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  9. #74
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    What percentage of first stage cooling accounts for total usage?
    Always here

  10. #75
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by energy star View Post
    What percentage of first stage cooling accounts for total usage?
    "First stage" is not applicable. Greenspeed inverter driven compressor varies from 40% to 100% of capacity based on load. No way to tell for sure, but my guess is it runs at 40% most of the time in the spring/fall and about half the time in the summer. In the summer it ramps to a higher % reaching 100% for several hours in the afternoon. Winter (if you want to call it that) it rarely runs at all.

  11. #76
    Join Date
    Jul 2007
    Location
    Delaware
    Posts
    3,824
    So in the spring and fall, it runs at a reduced capacity 40% of the time. Then summer rolls in, and we run at a reduced rate 50% of of the time? So overall, it's not at full capacity 60% of the time.
    Always here

  12. #77
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503
    Quote Originally Posted by energy star View Post
    So in the spring and fall, it runs at a reduced capacity 40% of the time. Then summer rolls in, and we run at a reduced rate 50% of of the time? So overall, it's not at full capacity 60% of the time.
    Not exactly. I'd say spring & fall it runs at reduced capacity (i.e., 40%-60%) almost 100% of the time. In the summer it runs at reduced capacity (i.e., less than 100%) about 75% of the time... all but about 6 hours during the hottest part of each day. So it runs at full capacity less than 10% of the time from March through November.

  13. #78
    Join Date
    Aug 2012
    Location
    Florida Space Coast
    Posts
    503

    Update for September 2013

    Here's an update through my last FPL billing as of September 12, 2013. My grandson moved back with his parents 2 weeks ago and the hot, humid Central Florida summer season should be winding down shortly. Still loving my Greenspeed!

    Bill Date Days kWH $Bill
    11/10/2012 30 794 81.05 *3-Ton Greenspeed installed 11/08/2012
    11/10/2011 29 811 84.22

    10/11/2012 29 1531 161.92 *3.5-Ton Rheem condemned 10/18/2012
    10/12/2011 29 1489 159.87

    09/12/2013 31 1346 140.50 **3-Ton Greenspeed 24/7 auto cooling (See NOTE #2)
    09/12/2012 30 1680 179.09
    09/13/2011 34 2081 229.53

    08/12/2013 32 1371 144.11 **3-Ton Greenspeed 24/7 auto cooling (See NOTE #2)
    08/13/2012 32 2360 257.78 *3.5-Ton Rheem leak repaired 07/31/2012
    08/10/2011 28 2064 227.74

    07/11/2013 29 1204 124.82 **3-Ton Greenspeed 24/7 auto cooling (See NOTE #2)
    07/12/2012 30 1868 200.87
    07/13/2011 33 2203 244.11

    06/12/2013 30 890 90.99 **3-Ton Greenspeed 24/7 auto cooling (See NOTE #2)
    06/12/2012 33 1741 186.81
    06/10/2011 30 1749 190.64

    05/13/2013 33 928 94.54 **3-Ton Greenspeed 24/7 auto cooling
    05/10/2012 29 1138 116.80
    05/11/2011 29 1438 153.71

    04/10/2013 29 910 92.68 **3-Ton Greenspeed 24/7 auto heating/cooling (See NOTE #1)
    04/11/2012 30 1119 114.06
    04/12/2011 33 870 89.77

    03/12/2013 28 594 63.14 **3-Ton Greenspeed 24/7 auto heating/cooling
    03/12/2012 31 637 66.21
    03/10/2011 28 420 46.64 *Windows open for Spring, 3.5-Ton Rheem turned off!

    02/12/2013 32 604 63.30 **3-Ton Greenspeed 24/7 auto heating/cooling
    02/10/2012 29 551 58.15
    02/10/2011 29 723 74.59

    01/11/2013 31 598 62.79 **3-Ton Greenspeed 24/7 auto heating/cooling
    01/12/2012 33 795 81.04
    01/12/2011 33 1137 116.60

    12/11/2012 31 566 59.64 **3-Ton Greenspeed 24/7 auto heating/cooling
    12/10/2011 30 579 61.95
    12/10/2010 31 580 61.04

    NOTE #1: 03/30/13 - 04/10/13: Had six family members visiting for Easter and four stayed on to help with garage sale and landscaping the following week. Extra daily baths, showers, dishwasher runs and hair dryer usage, cooking three meals a day, washer/dryer ran almost non-stop. They had all my doors and windows opened with A/C “off” for 12 hours a day while working between outdoors, the garage, the laundry, the kitchen, and cleaning out “junk” in closets. Outdoor temperature and humidity rose into the 80’s, Greenspeed “recovered” about 8 to 10 degrees each evening for sleep time.

    NOTE #2: 06/10/13: My grandson moved in with me... double the hot showers, triple the dishwasher runs, quadruple the cooking and washer/dryer usage. Not sure how much, if any, the FSEC retrogrades offset the increased power consumption related to a second resident. 08/25/13: My grandson moved out, but the puppy stayed!

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