Off-the-Charts© " CONTRACTOR MODELING SPREADSHEET"
FOR RESIDENTIAL EQUIPMENT SELECTION
Note: This is a new updated version
for Windows 8.1 and Windows 10!
ICC CODE REQUIRES USE OF AN ACCA
"OR OTHER APPROVED HEATING AND COOLING CALCULATION METHODOLOGIES"
FOR THIS TASK.
THIS "APPROVAL" IS
FROM THE BUILDING CODE OFFICIAL, NOT ACCA.
NOTE TO CODE OFFICIALS:
THIS PRODUCT IS INTERPOLATING FOR:
OUTDOOR TEMPERATURE, INDOOR
TEMPERATURE, INDOOR R/H, INDOOR CFM, COIL BYPASS FACTOR, ALTITUDE, and LOAD
CALCULATION SENSIBLE / LATENT RESULTS; in the same way manufacturers create
their expanded data charts from AHRI data.
please feel free to email firstname.lastname@example.org
with any technical questions.
But with OTC, you only enter your design
conditions, and the AHRI RATING
of what you want to use,
and you will see whether
the right choice.
You can then adjust your airflow,
to possibly match it closer to the latent / sensible needs from your heat load,
If you have manufacturer data,
you can also fine tune the OTC output to it if desired,
or verify whether IT is corrupt.
You can then proceed with
duct sizing, permit filing, etc.,
without having to wait on your suppliers'
You could also find and change your Brand selection and
model numbers easily,
at any later time with this same program.
THE CURRENT VERSION (v16.40.##) OF THIS PRODUCT ALLOWS ENTRY
HVAC SYSTEMS FOR ONE ADDRESS!
HERE'S WHAT THE RESULTS TABS
Install Instructions and
Videos Click here
The science of "Equipment
Selection" Click here
Compliance of OTC with Codes
and Other Standards Click here
Frequently Asked Questions
about OTC Click here
Why Expanded Data Charts are a Joke!
Download a Free 30 day trial version of
Most computers will use the 32-bit Self-Installer, try
it first, click the check-mark, and select "Run" when prompted:
32 bit Self-Installer (puts shortcut on desktop):
Some PC's may require manual installation,
see the install instructions page to help on using zip files:
32 bit Excel zipfile:
64 bit Excel zipfile:
There are no annual fees, per use fees, you OWN this
software. You will be sent a license key after purchase. There is no charge for
minor revisions sent out the first year.
AFTER YOU HAVE REVIEWED THE TRIAL, please fill out these
information boxes and then click the buy-now button below:
5 HVAC System price is $125.00 FOR ONE COMPUTER
THE POP-UP BOX OF THE TRIAL INDICATES
HOW TO SEND AN E-MAIL WITH YOUR INFO TO ACTIVATE YOUR PROGRAM COPY AFTER PAYMENT.
(see videos link above)
NOTE: PLEASE ALLOW 1-4 DAYS TO
YOU MUST SEND YOUR COMPUTER I.D. EMAIL!
not approved by ACCA Manual S