Luis Hernandez
  • Rhinebeck, NY
  • United States
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Air Source Heat pump or mini-split efficiency

Greetings everyone!    I have a technical questions I hope I could get some feedback! I understood that air source heat pumps are very efficient because of their ductless configuration. I have been…Continue

Tags: efficiency, duct, ductless, minisplits, pump

Started 6 hours ago

Open cell foam and cellulose... Can they work together?
11 Replies

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing…Continue

Tags: foam, cell, open

Started this discussion. Last reply by Richard Beyer Mar 29.

Calculating BTU lost per cfm leaks
23 Replies

Hi everyone,    A couple of my colleagues were discussing the benefits of air sealing, when I was asked if I could quantify the actual value of air sealing based on how many BTU's per CFM(50) of air…Continue

Tags: saving, energy, sealing, air, CFM

Started this discussion. Last reply by Dmitri A Martin Feb 1.

Calculating heat loss
3 Replies

Could anyone help me calculate a breakdown that shows  heat loss in BTU/hour that adds up to 100% and shows % or subtotals for the sub-categories that add up to 100% based on  u values and Area for…Continue

Started this discussion. Last reply by Bud Poll Jan 21.

 

Luis Hernandez's Page

Latest Activity

Luis Hernandez posted a discussion

Air Source Heat pump or mini-split efficiency

Greetings everyone!    I have a technical questions I hope I could get some feedback! I understood that air source heat pumps are very efficient because of their ductless configuration. I have been told by a very smart person that adding a duct to a airsource heat pump (Daikin has now a unit that comes with duct) does not diminish with any great significance the efficiency of the unit.     I of course have my reasons to believe that using ducts is increasing the liability to the system, but I…See More
6 hours ago
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sean thanks for pointing that out. You may have missed my point. If a home has high humidity and you add SPF, it needs to be dehumidified to within published standards. A well balanced HVAC system helps maintain a balanced home. In some homes the…"
Mar 29
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sorry Richard, but that has nothing to do with the HVAC, that had to do with to thin of a layer of foam not meeting the dew point depth required. To top that off I would also state that they probably were not maintaining moisture levels in their…"
Mar 29
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"This link show's a risk you face when using closed cell without a balanced HVAC system. Your risk using open cell I described previously. This only shows insulation alone will not eliminate your problems if you do not plan…"
Mar 29
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Ahh but we are talking the attic floor & not the roof sheathing, no? As for hot roofs aka encapsulated attics, the issue is dew point considerations & as Richard points out, Lynene spread so much dis-information it made it nearly impossible…"
Mar 29
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Guy's this leak stuff is a made up story by a major spfi chemical manufacturer. At that time when the story was flying all over town, this same manufacturer did not have closed cell in it's inventory. People believed it and obviously still…"
Mar 28
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sean I am still wondering why we need airsealing in the center of a piece of plywood that is already airtight.  The money would be better spent on a layer of rigid foam on the outside so cut down on thermal bridging and to add R-value."
Mar 28
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"I am right there with you Ed but with that many use the open cell to do the air sealing for them & then top it off with cellulose - the system does work great (though it should be 3-4" based on specs / test results & not 2"…"
Mar 28
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Why not just seal the actual leaks in the attic floor, then blow with cellulose and save a bunch of money?  This is similar to flash-and-batt in exterior walls and I have yet to understand why this is done.  My theory is that the closed…"
Mar 27
Bpb Farmer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"NEVER use closed cell in an attic space! Closed cell is just that, water will not pass threw. So you get a leak in your roof, the water will go some where. It may build up, evaporating back into the attic space, it may find it's way to an…"
Mar 27
Richard Beyer replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Should be 2 inches of closed cell and then cellulose. The closed cell will act as the vapor barrier. Cellulose will act as the flame retardant. Both can work as a system. Most importantly the installer's credentials and insurance must be…"
Mar 26
Luis Hernandez's discussion was featured

Open cell foam and cellulose... Can they work together?

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing just that.... I myself cannot imagine what that could be (of course preparing to give the foam enough time to cure)Any comments?Thanks,    LuisSee More
Mar 21
Sean Lintow Sr replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Vapor issue is the only one I can think of though if you use a vapor retarder paint you should be fine & is accepted by many codes (do not use plastic & if it is there remove it) I can't think of any other issues with using it &…"
Mar 21
Luis Hernandez posted a discussion

Open cell foam and cellulose... Can they work together?

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing just that.... I myself cannot imagine what that could be (of course preparing to give the foam enough time to cure)Any comments?Thanks,    LuisSee More
Mar 20
John Watson Ley replied to Luis Hernandez's discussion Modeling the apartment upstairs in the group TREAT Software
"Paul, Good Evening, John here, did you ever get an answer from anyone to this question?  I am fairly new to TREAT but I am willing to discuss this if it still matters to you? John@jwlasso.co.uk"
Feb 24
Dmitri A Martin replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"Don't put any faith in standard formulas that convert cfm50 reductions into air sealing savings.  A house doesn't naturally experience air exchange at a 50 pascal pressure difference.  A blower door will cause air to enter the…"
Feb 1

Profile Information

Company
Gaia Sharbel Energy Contracting
Professional Certification
BPI AP, BPI EP, cSBA, IEEE
Professional Interests
Solar passive, sustainable, renewable energy solutions, Energy Star, Energy Audits
Website URL
http://www.loweryourenergynow.com
LinkedIn Profile
www.linkedin.com/pub/luis-hernandez/6/859/9b0/

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At 3:21pm on August 15, 2013, Diane Chojnowski said…

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Air Source Heat pump or mini-split efficiency

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