Wall Information
Select the Wall Construction type that best describes your situation using the drop down list box. Carefully measure the length of each outside wall and, multiply by the ceiling height. Subtract window area. Record the total sq. ft. of exposed wall in the “Sq. Ft.” field. Enter the Temperature Difference using the drop down list box.
Ceiling Information
Select the Ceiling Construction type that best describes your situation using the drop down list box. Record the total sq. ft. of ceiling in the “Sq. Ft.” field. Enter the Temperature Difference using the drop down list box.
Floor Information
Select the Floor Construction type that best describes your situation using the drop down list box. Carefully measure the length and width of each room and multiply to calculate total floor space. You may also use outside wall dimension if practical. Record the total sq. ft. of exposed wall in the ”Sq. Ft.” field. Enter the Temperature Difference using the drop
down list box.
Infiltration
Enter the total cubic feet area of the building (square footage of floor times average height of the wall. Example: 2000 x 8 = 16,000) and the number of Fireplaces in the structure. Using the drop down list box, select the Infiltration Quality of the building. This is a subjective call on your parts. Consider the age of the building, overall quality of the windows and doors, weather stripping, etc., and use your best judgment.
Duct Gain or Loss
Select the Duct Location and Insulation that best describes your situation. Using the drop down list box, select the Supply Air Temperature that best describes your situation.
People
Enter the total number of people who generally occupy the building. Note: We use a 300 BTU per hour heat load per person.
Appliances
We assume a standard 1200 BTU per hour heat load for appliances. You may override this value if you feel it is warranted.
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May 21st, 2011 at 12:26 pm
I made a mistake on a calculation and could not go back to correct and had to do the entire processes over. In the past a correction could be made.
May 22nd, 2011 at 12:39 am
Hi Marvin, I will look into that. I plan some improvements on this soon too. Thanks for the comment.
August 8th, 2011 at 8:41 pm
Love the changes you made. I’ve been using your site for over a year. Thanks for saving me some much needed time!
August 19th, 2011 at 2:46 pm
where the heck am i supposed to put the house volume?
August 19th, 2011 at 3:26 pm
The volume is calculated automatically based on other information that was entered.
September 9th, 2011 at 12:19 pm
This appears to be potentially a good program to get an idea of Heat Gain Heat Loss using this calculator, however, when clicking on “Step 7:Show Report” an error message states “Please enter house volume”, but there is no place to enter it. James L. (#4) response states that it calculates it automatically base on the other information that was entered. It doesn’t calculate it at all. It will not allow one to click on “show report” without getting the error message. Is there a trick to this? I tried it on two different computers, one with Google Chrome and the other with Internet Explorer, with Windows Vista and Windows XP, but still no luck. Any suggestions? It appears to be an interesting calculator. Thanks.
September 12th, 2011 at 4:43 pm
There is no place to put house volume. What about question #4. Volume is 2112 cu ft.
September 19th, 2011 at 10:17 pm
HOW TONS REFRIGERANT FOR 1320 SQ.M.? AND HOW MANY TONS REFRIGERANT FOR 165 SQ.M. MODERATE TO HIGH HEAT
October 6th, 2011 at 4:23 pm
[...] need for heating or cooling is referred to as heating load. Take your climates worse day, when the temperature difference between outdoors and indoors is the [...]
October 13th, 2011 at 7:45 pm
[...] Click here to link to the Free Heat Gain Heat Loss Load Calculator by Mr. HVAC. This calculator is used to size heating and air conditioning equipment. Search for: [...]
November 30th, 2011 at 9:25 am
Regarding the “Please enter house volume” Message:
This error ocures when Volume Cubic Feet and Number of Fire Places are not filled in. See Step 3 Infiltration.
Enter the total cubic feet area of the building (square footage of floor times average height of the wall. Example: 2000 x 8 = 16,000) and the number of Fireplaces in the structure. Using the drop down list box, select the Infiltration Quality of the building. This is a subjective call on your parts. Consider the age of the building, overall quality of the windows and doors, weather stripping, etc., and use your best judgment.
I have noticed that on some computers these fields don’t display the way we designed them to. They can be hard to see because the formatting is not correct. I will have programming improve this error message and see what we can do about the formatting.
Thank you.
December 6th, 2011 at 9:14 pm
There are places to enter those values in Step 3. I wonder if there is an issue with a certain browser (not showing the the entry boxes). What browser are you using please?