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  1. Energy efficient house for north central Texas

    It is possible to heat and cool a 4,000 sq. ft. house in North Central Texas with a 2 ton heat pump.

    I have lived in this house for about six years, and I know it works. I keep the house at 68 in...
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    This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  3. Thread: An observation

    by paul42
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    According to the latest statistics I can find,...

    According to the latest statistics I can find, less than 1% of all CO deaths in the US are attributed to gas cooking appliances. And that includes ovens wich are typically much worse than cooktops...
  4. Thread: An observation

    by paul42
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    1,126

    In my house, a dedicated make up air duct would...

    In my house, a dedicated make up air duct would not be cost effective. We typically run the exhaust hood less than an hour per week.

    The cost of the motorized damper alone would overwhelm any...
  5. Thread: An observation

    by paul42
    Replies
    12
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    1,126

    I am not convinced that a dedicated make up air...

    I am not convinced that a dedicated make up air duct is the right answer for residences. The make up air is bringing in additional heat and humidity no matter where it is located and it is foolish...
  6. Thread: An observation

    by paul42
    Replies
    12
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    1,126

    An observation

    and fair warning to those that might want to install a large capacity range hood.

    Late yesterday evening, I happened to notice that the thermostat claimed the temperature in the house was 76, even...
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    I don't see how anything could be any more...

    I don't see how anything could be any more comfortable than my 14 SEER Trane. I can not hear it running. It keeps the temperature within about a degree of the set point and maintains good humidity...
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    Personally, I would not look at any HVAC...

    Personally, I would not look at any HVAC equipment that takes more than about 2 years to payback. It will not be much longer than that and we will have LENR HVAC equipment at $.25 a megawatt / hour.
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    when to oversize

    http://apps1.eere.energy.gov/buildings/publications/pdfs/building_america/energy_savings_heat_pumps.pdf
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    I designed the duct work for the house before I...

    I designed the duct work for the house before I ran HVAC calc. The result of this backwards design is that the duct work is sized for a 5 ton unit and we ended up only needing 2. I have 4 twelve...
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    I normally run the fan speed on auto. I tried...

    I normally run the fan speed on auto. I tried running it on low and it did not change the humidity control issue.

    If the Fujitsu has an option to set the indoor coil temperature it is not...
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    I'm trying to understand how an additional supply...

    I'm trying to understand how an additional supply to the bedroom with a slave damper would work. We keep the house around 74 degrees in the daytime, and we keep the bedroom around 68 to 70 at...
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    Then I still do not know why the outdoor fan is...

    Then I still do not know why the outdoor fan is running when the inside unit is off.
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    I suppose that lightning is a possible culprit. ...

    I suppose that lightning is a possible culprit. However, with devices like this, the normal result of a lightening strike is that it stops working all together. I also have whole house surge...
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    On this mini-split, there is nothing as simple as...

    On this mini-split, there is nothing as simple as a relay, which makes it difficult to troubleshoot. The condenser fan motor is electronically controlled variable speed inverter driven. It does...
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    Still unhappy with my mini-split

    I have a Fujitsu 18RLQ with the wired control panel. Due to several issues, we only run it at night when we are at home, especially curing the cooling season.

    I had a technician out to look at it...
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    Because the ducts are inside the conditioned...

    Because the ducts are inside the conditioned space, there are no duct losses.
    Hvac-Calc has limited options for infiltration values and wall insulation. I chose the closest match I could come up...
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    I used HVAC calc to figure out the size of the...

    I used HVAC calc to figure out the size of the heat pump that I needed.
    Total heat gain
    6,076 Infiltration
    4,929 Walls
    2,650 People
    2,124 Windows
    1,464 ...
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    My wife is a very private person and has told me...

    My wife is a very private person and has told me to never post pictures of our house on the internet. She is very proud to show it to friends and family, but not to the world.

    The insulation...
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    six inch duct from outside to the return of the...

    six inch duct from outside to the return of the air handler.
    I've thought about adding an in-line fan and a CO2 controlled switch, but haven't got there yet.

    Before my CO2 monitor died, it said I...
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    Different climates call for different answers,...

    Different climates call for different answers, and every lot / home design changes what is cost effective.

    For this part of the country, the secrets are
    put the air handler & duct work in...
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    There is one supply and one return in the...

    There is one supply and one return in the basement. The majority of the cooling comes from the uninsulated metal duct work that is located in the lower level. The heat pump water heater in the...
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    It is an unusual house. The house is on a slope....

    It is an unusual house.
    The house is on a slope. The top floor is the living quarters and is 2,300 sq. ft.. The bottom floor is storage and mechanical with no windows and only one exterior door. ...
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    Put the air handler & duct work in conditioned...

    Put the air handler & duct work in conditioned space.
    Shade all the windows in the summer.
    Make the house air tight.

    West end of Fort Worth.
    Upstairs, it is 73.9, downstairs is 68.
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    I know my home is tight. 4,000 sq. ft. 2 ton...

    I know my home is tight.
    4,000 sq. ft. 2 ton heat pump, 108 outside, 73.8 inside.
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    The above reply points out how difficult the...

    The above reply points out how difficult the problem is and therefore even if it is not an answer that works for you, it is putting boundaries on the possible answer. The reply is trying to show you...
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    http://www.coolerado.com/ looks like the idea...

    http://www.coolerado.com/

    looks like the idea answer to me
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    ICF

    I am assuming that you are going the ICF route to make your house resistant to hurricanes?

    For the increase in R value, it is not really cost effective.

    I heat & cool 4,000 sq. ft. in North...
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    North Central Texas. No, there is not a lot of...

    North Central Texas.

    No, there is not a lot of air movement, but I don't need a lot.
    It makes for a VERY quiet system. I put a streamer on the duct in my office so I can tell when it is on.
    ...
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    I'm glad I did my own manual J - 2 tons for 4,000...

    I'm glad I did my own manual J - 2 tons for 4,000 sq. ft. Works great.
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    Make your design decisions wisely. You may be...

    Make your design decisions wisely. You may be paying the electric bill longer than the mortgage.

    Put the duct work in conditioned space.
    shade all the windows in the summer.
    Make the house...
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    The problem posted by the OP is lack of comfort...

    The problem posted by the OP is lack of comfort when the system is in stage 1.

    The OP believes this is related to the low airflow.

    Comfort in an air conditioned room is based on airflow,...
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    Put the air handler & duct work in conditioned...

    Put the air handler & duct work in conditioned space.
    Shade the windows in the summer.
    Air seal the house.

    I heat and cool 4,000 sq. ft. in North Central Texas with a 2 ton heat pump.

    A...
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    humidity control in the summer may be an issue....

    humidity control in the summer may be an issue.
    I have found that the mini-splits are good for heat but do not offer good humidity control.
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    My 2 ton Trane heat pump will keep my house at 74...

    My 2 ton Trane heat pump will keep my house at 74 degrees on a day when it hit 108 outside.

    There is no doubt concerning the model number.

    Again, shade all the windows in the summer, put the...
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    North Central Texas, 4,000 sq. ft. - 2 ton. I...

    North Central Texas, 4,000 sq. ft. - 2 ton.
    I keep my house at 74 degrees in the summer.

    Shade the windows in the summer.
    Put the duct work and air handler in conditioned space.
    Make the house...
  37. There used to be a hybrid geo / air system sold. ...

    There used to be a hybrid geo / air system sold. It used a typical air cooled condenser to get the liquid temperature down close to ambient, and then an underground coil to cool it even further. ...
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    There used to be a company that made a water...

    There used to be a company that made a water cooled condenser unit. I don't know if they are still in business or not.
    The condensing coil was in the bottom of a pan of water. The fan pulled air...
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    About two years ago, I was having problems with...

    About two years ago, I was having problems with the thermostat on my new Trane heatpump. The one the dealer put in was a piece of junk. I decided that a Honeywell IAQ was the right answer and would...
  40. With higher efficiency A/C systems came lower...

    With higher efficiency A/C systems came lower temperature outputs from the compressor which lowers the efficiency of heat recovery sytems. They could be used for a preheat tank that feeds a water...
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    My understanding is that the gaskets often do not...

    My understanding is that the gaskets often do not work as well as advertised. I would be interested if anybody has any research that wasn't paid for by the gasket manufacturers to show otherwise.
    ...
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    REALLY oversized. I heat & cool 4,000 sq. ft. in...

    REALLY oversized.
    I heat & cool 4,000 sq. ft. in north central Texas with one 2 ton heat pump. It stays 74 degrees inside when it is 110 outside.
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    Interior non-load bearing walls are easiest. ...

    Interior non-load bearing walls are easiest.

    For my own house, I used this method to get the supply vents high up on the walls from a basement air handler.

    In my case, all of the duct work is...
  44. If possible, get a foam gun for canned foam, a...

    If possible, get a foam gun for canned foam, a good work light, and spend a little time sealing all the possible air gaps in the ceiling from the attic side.

    Pay particular attention to any...
  45. Your HVAC system may or may not be the culprit....

    Your HVAC system may or may not be the culprit.
    Get the return duct fixed.
    Make sure you do not have any leaking duct work.
    Add sun screens to your east and west windows.

    Have an energy audit /...
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    Sounds like a fun! I will try to add it to my...

    Sounds like a fun! I will try to add it to my list of projects for my retirement years. If I'm going to bulid it, I might as well use the waste btus to preheat the water going into the water...
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    Now you are starting to talk about a dedicated...

    Now you are starting to talk about a dedicated ventilation / fresh air system, similar to what they are starting to put on new commercial buildings.

    If inverter driven systems get cheap enough, it...
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    Ray Moore takes advantage of the fact that the...

    Ray Moore takes advantage of the fact that the A/C system is more efficient in the early morning hours when the outdoor temperature is at it's lowest point of the day. He has posted figures for his...
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    Ray Moore also tends to size the A/C systems so...

    Ray Moore also tends to size the A/C systems so they only need to run for a few hours each morning when they are the most efficient.

    Due to his method of construction, the internal temperarue...
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    I used this method for the walls of my house, but...

    I used this method for the walls of my house, but not for the roof. I really like the idea, but for my particular house, using it on the roof did not appear to be cost effective. Due to the slope...
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