Heat Gain and Loss Calculator
STEP 1 of 6: Enter Your Job Information
Name
Phone
Address
City
State
Zip
Job
STEP 2 of 6: Design Temperatures
  Inside Outside
Winter
Deg F Deg F
Summer
STEP 3 of 6: Construction Details
Gross Wall

SqFt
Ceiling

SqFt
Floor
SqFt
Infiltration
Vol Cu Ft  Fireplaces 
Duct Gain/Loss
People
(Assume two persons per bedroom)
Appliances
STEP 4 of 6: Additional Items
SlNo BTUH Loss Heating Factor Description Cooling Factor BTUH Gain
1.
2.
STEP 5 of 6: 
HEATING: DOORS & WINDOWS
Note: For sliding glass doors, use the factors for the same type of window.
Window & Door Types Frames Area BTUH
Loss
1) Single Pane Clear
2) Single Pane With Storm
3) Double Pane Clear
4) Double Pane With Storm
5) Triple Pane Clear
6) Jalousie Single
7) Jalousie Single w/storm
8) Skylights Single
9) Skylights Double
10) Door Wood Only
11) Door Wood w/Storm
12) Door Urethane Core (R-5)
13) Door Urethane Core
     (R-5)w/Storm
TOTALS
STEP 6 of 6: 
COOLING: DOORS & WINDOWS
Note: Calculator assumes windows have inside shading by draperies or
Venetian blinds and that sliding glass doors are treated as windows.
Direction Panes Area BTUH
Gain
1) N
2) NE & NW
3) E & W
4) SE & SW
5) S
6) Skylights
7) Wood Door
8) Metal Door
TOTALS

This calculator uses established principles of thermodynamics. It was not designed to comply with the Manual J® principle. Manual J is a trademark of Air Conditioning Contractors of America (ACCA)®. Mr. HVAC is not affiliated with ACCA.

Print Friendly

3 Responses to “Heat Gain and Loss Calculator”

  1. wayne Says:

    great

  2. ron green Says:

    HI I have tried several times using different browsers to view my load calculation report but it keeps sending me to a message site not available. what else do I need to download to be able to use your service.

    Regards
    Ron

  3. JamesLeichter Says:

    We are sorry you are having problems with the calculator. I had several of my co-workers try the calculator out this morning. We used different computers and different browsers. It worked properly. We will try other tests. If you have other information, screen shots, etc., please pass it on. Thank you.

Leave a Reply


+ 3 = twelve