Can anyone suggest a good and easy to use program for load calculation please .
Has anyone used EMS HVAC load calculator? Thank you.

Views: 501

Reply to This

Replies to This Discussion

What is goal?   just to size the the house?  Cost the system?  Pay back on HVAC upgrade?  Pay back sealing building? How much do you do a year?  If just one a yr just MJ 5 or do it by hand.   If like me 3-4 a day then need it quick I will use design star / write soft and this will give pay back and pre sell the job.

Thank you Eric
I am just doing new homes and need to determine the size of equipments .i will be doing over 100 homes per year
Thank you for your help

I like Wright soft with drawing boxes,  I can run a load in 10 min whole house. room to room in 60 min.  I find the number a little high 20% if not using blower door  and right R- in  walls and attic. if building is rated very loose and end up tight then very over  in BTU's.   I like to run the heating system at design temp and see if it runs 100% at night, that's my goal.   Most systems are 300% to large around here  I see a 120,000 BTU and needs only 33,000 BTU at very cold design temp  or a 3 ton AC  after attic sealed and windows redone  just 2 ton is needed.  Look at the tablet whole house app.

Thank you so much Eric

I got to agree with Eric on WrightSoft - with that let me also add; get training on it. It is to easy to get the numbers wrong & it will help you make sure you aren't oversizing to much. With that they will also show you that Manual J is not the end all be all - you still have to work through Manuals S, T, & D and how to get it right using their software.

Elite software is what I use. The company also has tech support.

Wrightsoft. With the accurate inputs, full version, I have hit the actual design load--clocked meter- within 3% and one, which deliberately under-sized, anticipating unfinished improvements proved within 5%. 

The learning curve can be steep but we design radiant floors, walls, driveways and Unico high velocity as well as low velocity all with one brand. 

how did you prove the load is right?  This winter I am putting a hour meters on heating systems on a very tight buildings. I find 80% of systems are very over sized 3-4 times is very common   

Clock the meter under design conditions. 

do you find the gas gas meter to be off as much as 30% - more when old? Just  Change out the meter then gas cost go up?  I find the inside cups fill full  of "tar" like a carburetor, and bearing get coated.    


Latest Activity

Jonathan Beers posted a discussion

MGE hiring for my job

I'm retiring next spring, and MGE is hiring:…See More
8 hours ago
Summer Reyes's blog post was featured

Equipment We Use: Detecting Water With Infrared Cameras

You know water is somewhere on the property, you can smell the mildew, but can't determine the…See More
9 hours ago
Profile IconGlenn Hourahan and Joseph Frasier joined Home Energy Pros Forum
9 hours ago
Alfredo Baccari added a discussion to the group Job Board

HERS or/and BPI Energy Inspector in SF Bay Area (SAN JOSE, CA).

ELEM3NTS is a leading energy efficient consulting company specializing in residential homes. We…See More
10 hours ago
Alfredo Baccari joined Diane Chojnowski's group

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
11 hours ago
David Byrnes's blog post was featured

Strategies for Hiring and Interviewing for Home Performance Professionals

Hire slow and fire fast.  It’s a phrase that experienced managers and human resources professionals…See More
14 hours ago
Dara Bowser replied to Don Fugler's discussion joining ducts in the group HVAC
"Good to hear you have clean dryer ducts Don. The dryer duct issues that we run into are…"
Don Fugler replied to Don Fugler's discussion joining ducts in the group HVAC
"David, If the IMC mandates metal dryer duct and prohibits metal screws, they must be accepting…"


  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service