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HOME OF "OFF-THE-CHARTS"

EQUIPMENT SELECTION AND OPTIMIZATION SOFTWARE

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(To quick install trial, purchase or update: Click the star )

THIS IS AN ACCA MANUAL S
"OTHER APPROVED METHOD"
This is the PREMIUM "Other approved software" referred to in ICC codes, and best satisfies
the need for compliant ACCA Manual S results PROPERLY and quickly,
wherever ICC code mandates are enforced, requiring this; "approved" by the building official.

IT IS THE FIRST, AND ONLY SOFTWARE MADE WITH CARE TO BE FAITHFULL TO THE INTENTS OF ACCA'S MANUAL S AUTHOR, HANK RUTKOWSKI. OTC MAKE'S NO MOCKERY OF HIS WORK!

You get confirmation of the the best matched systems, AND the proper configuration
settings YOU need for them, for maximum comfort anywhere in America.

With only a 2.3% average calculation error
(and much less opportunity for human error),
it has never been rejected, and is trusted, even by "strict" building officials.

----------------------------------- DISCLAIMER WARNING ---------------------------

THIS NEW PRODUCT VERSION (release v.23.90.10) ONLY DIFFERS FROM THE PRE - SEER1 RELEASE, WITH NEW LIABILITY WARNINGS (and some minor appearance items)

DO NOT USE OFF-THE-CHARTS (OTC) WITH THE NEW 2023 AHRI M1 RATINGS!!

OTC WAS CREATED FOR THE AHRI 210-240/2017

M RATING METHOD USED FOR THE LAST 70YRS.

BECAUSE OF 2023 DOE CHANGES, TO A RADICALLY NEW 210-240 2023 METHOD WERE JUST MANDATED THAT JANUARY, ONLY THE 210-240 2017 AHRI RATING STANDARD WERE EVER TESTED WITH THE CURRENT OFF-THE-CHARTS PRODUCT. With OTC YOU MUST VERIFY YOUR EQUIPMENT SELECTION ON THE ARHI WEBSITE STILL SHOWS RATINGS UNDER THE STANDARD 210-240 2007 (M) COLUMN, AS SHOWN BELOW, OR A "YES" UNDER THE "DESIGNATED TESTED COMBINATION" COLUMN.

DO NOT USE ANY DATA FROM THE 210-240 2023 (M1) COLUMNS, (see AHRI directory screenshot below) WITH THE Off-the-Charts PRODUCT!!! RESULTS WILL NOT BE COMPLIANT TO ACCA MANUAL S METHOD, AND THE HVAC CONTRACTOR ALWAYS BEARS THE LIABILITY ON THIS.
(But research will proceed on OTC, to possibly develop the new algorithms needed)

THE GOOD NEWS IS THIS NEW RATING MAY NEVER TAKE ROOT, CONSIDERING A DIRECTORY SEARCH OF A MAJOR BRAND'S ENTIRE LISTINGS, ONLY RESULTED IN THESE 6 "TESTED" NEW STANDARD RATINGS OUT OF 194,794 TOTAL RESULTS!

Use this link to AHRI directory for verification.

-------------------------- END OF DISCLAIMER -----------------------------------

For Off-the-Charts in a nutshell;

Click here to watch one-minute You-Tube promo

We are open to inquiries from capital investor(s). The seeds of OTC were planted nationwide, and common sense could take root very soon.

(For "Off-the-Charts^© for educators",click here:
College Instructors and Professors of HVAC)

THIS IS A UNIVERSAL CONTRACTOR MODELING SPREADSHEET" (OTC),
AN ALTERNATIVE (AND COMPLIANT) METHOD TO ACCA'S MANUAL S, FOR RESIDENTIAL HVAC EQUIPMENT SELECTION.
For pity's sake, why is our industry stuck on stupid? Everyone just does their own thing with this, including fancy $$$ load-calc software.
EVEN THE NEW "ONLINE" EQUIPMENT CALCULATORS DON'T MATCH THEIR OWN PRINTED DATA!

Get results, with no Expanded Data charts needed!

1. Why would I need "Manual S"?

ICC code dictates it.

2. What's it for?

It's used AFTER the load calculation, to select equipment.

3. Why not just use the model # ?

Model numbers only roughly give a clue on BTU capacity.

5. Usn't AHRI giving the capacity?

AHRI rating is nominal, like a MPG sticker on a car.

4. Who's going to know anyway?

The home occupant may not get the correct size unit and comfort. This is really just the 2nd half of load calculation.

5. I think I have Manual S in my software already, why pay for this?

BECAUSE NOBODY DOES THIS BETTER! WE DID IT FIRST, YOU CAN FACT-CHECK THAT!
NO ONE ELSE HAD MANUAL S IN THEIR PRODUCT, UNTIL THEY SAW OFF-THE-CHARTS, AND THEN GAMED THEIR PRODUCT TO KEEP UP.

We have found current popular software is time consuming, over complex to use, missing pieces of ACCA's guidelines, and NOT compliant to their manual. Some just crudely added the feature recently by R&D (rip-off & duplicate), just to compete with OTC.

(They are an insult to ACCA's intent, and are missing the best features of Mr. Rutkowski's Manual S)

This OTC method was presented at the 2019 HVAC Excellence National Educators Conference, with good reviews, and the presentation is available for purchase on thier website. Click star to see the PowerPoint presentation:

5. Why did you make this program to require Microsoft Excel?

ACCA's original hand-filled forms were all in tables, and since Excel was created (like old Lotus 1-2-3) to make powerful tables, it was just common sense to use it. We will eventually create this as a standalone product, used by any device with an internet browser, but we have not found an economical and efficient utility to make that happen yet. (OR ANY CODE WRITERS WHO WOULD LIKE A PIECE OF THIS ACTION!)

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Version detail, install trial, purchase or update:
Click the star

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Why Use OTC instead of ACCA method?
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Videos for program usage
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The science of "Equipment Selection"
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Compliance of OTC with Codes
and Other Standards
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Frequently Asked Questions about OTC
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Using OTC with Elite's Rhvac program
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not approved by ACCA Manual S