I am trying to determine what the weighted average R-value of a Superior Wall XI and XI plus wall is. Does anyone know? I can post cross sectional diagrams if…
How do I calculate the interior temperature of a window at a given outside temperature with a fixed interior temperature?
I am trying to predict at what outside temperature will I get condensation on my windows. If it is 70 degrees inside with 40% relative humidity and my window has…
I would like to calculate how much energy/money I am losing from duct leakage outside my building envelope. Is there a way to quantify how many BTUs I am losing…
Equipment costs Alex, does the equipment cost include the cost of the truck? $70,000 seams like a lot of money for a blower and a vacuum system even with the added cost of the adhesive injection. Thanks
Posted: 11:43 am on July 25th 2013
Cost of HRV What is it that makes HRV's in general and the Zhender in particular so expensive?
Posted: 04:15 pm on February 20th 2014
So here is what prompted the question. I have a customer that heard about this product called aeroseal. I have heard of the product before and have heard good things about it. The only bad thing that I have heard about it is the price. I have seen quotes between $1500 and $3000 dollars. So the ever present question is "is it worth the cost. Without modeling the cfm drop and measuring the total leakage and leakage to outside, before and after, there is not a good way to answer this question. What do you think?
Posted: 05:44 pm on March 10th 2014
Really? Green? I think this would help builders meet the minimum code and provide another set of trained eyes to catch issues before they become call backs. Especially in places where code means they cash your check and fax you the certificate of occupancy. Green? Not a chance.
Posted: 03:04 pm on November 14th 2014
It is very nice that this It is very nice that this home will be more efficient than the typical home of this size in this area. I applaud your work to raise the bar. But Green?? It must mean something different than it used to.
Posted: 09:39 am on December 9th 2014
Multi head or multiple head So say you have a single room load of 24000 BTU's. Would it be more efficient to use a single head unit with that capacity or to use two smaller individual units (each with there own outdoor unit)? It seems that you could use only one unit in part load seasons and run the second unit only when the seasonal loads require more BTU's.
Posted: 04:58 pm on June 21st 2013
big load The room is a laundry with a couple of commercial dryers. The load is only when the dryers are running. It is about 1000 square feet of floor space. The walls are From the outside in: double layer of plank,one vertical and one horizontal, about 3" thick, Plaster, 2.5" gap then 2x4 framing all filled with dense pack cellulose, 1/2" drywall. The floor is uninsulated over an insulated basement. The ceiling is a ten inch joist with dense pack cellulose with an apartment above. The only windows are on the North side. This is in zone 5. So you can see that the biggest load is the cooling load with the dryers running. I usually deal with residential so having larger equipment loads is new to me. Thanks for your input.
Posted: 09:40 am on June 23rd 2013
Rita's builder Hey Rita, was your builders first name Ryan?
Posted: 02:22 pm on July 28th 2013
Posted: 11:57 am on May 23rd 2016
Thanks for the therms. I am looking for the most accurate inputs for modeling in REM. Of course now I will have to model all my assemblies in therm to make it a fair comparison.
Posted: 01:38 pm on May 23rd 2016