(THIS IS A DESKTOP
PC PRODUCT, NOT FOR SMART PHONES).
The current version is: v.25.40.10
(WARNING,
DO NOT USE Off-the-Charts V.15.85 OR OLDER, EVER!)
YOU CAN GO
STRAIGHT
to install trial, send a request for purchase,or SELF-update a licensed OTC2SEERS free
by clicking this gold star
(or as is said; "let the buyer beware", and read on to see what this
even is:)
SO WHY BUY THIS, WHAT'S IT EVEN FOR?
IT'S COMPLIANT TO ACCA MANUAL S, A MANDATORY REQUIREMENT OF ICC CODE IN
MOST STATES NOW, FOR LEGAL RESIDENTIAL HVAC INSTALLATIONS.
THAT"S
WHY!
THIS
NEW PRODUCT (Off-the-Charts2SEERS) HAS THE
SAME SEER1 USAGE, BUT NOW CAN WORK THE SAME FOR SEER2
M1 RATINGS WITH ONE CLICK, SELECTABLE FOR EACH
SYSTEM, IN CASE SEER1 RETURNS.
OUR
NEW
DUAL-SEER RELEASE IS NOW STANDARD, BUT YOU WILL NEED TO REQUEST A NEW UNIVERSAL LICENSE
KEY .
(OTC
WAS INITIALLY CREATED FOR THE AHRI 210-240/2017
SEER1 M RATING METHOD, USED FOR THE LAST 70YRS.)
OTC is the PREMIUM "Other approved software" referred to
in ICC codes,
and is also the most compliant to ACCA Manual S guidelines. Has been PROPERLY and
quickly accepted wherever ICC code mandates are enforced. The ICC only requires
that ACCA Manual S "or other approved method" be accepted by the building official.
IT IS THE FIRST, AND ONLY SOFTWARE MADE WITH
CARE TO BE FAITHFUL TO THE INTENTS AND GENIUS OF ACCA'S MANUAL S AUTHOR, HANK
RUTKOWSKI. EVEN HE APPROVED OTC!
UNLIKE SOME OTHERS, WHO NOW MAKE A MOCKERY OF HIS HARD WORK!
SHAMEFUL!
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 still on SEER1, and shrinking 2.9% on SEER2,
(and much less opportunity for human error),
it has never been rejected, and is trusted, even by "strict" building officials.
----------------------------------- DISCLAIMER
WARNING ---------------------------
YOU CAN
STILL USE PRIOR VERSIONS OF OTC (v14.41 to 24.35) FOR SEER1. BUT NOT SEER2.
BUT, The NEW
mandated 2023 SEER2 AHRI RATINGS are already getting close to being scuttled in
Congress as of MAY 8, 2025!
BECAUSE JANUARY 2023 DOE CHANGED TO A RADICALLY NEW 210-240 2023 METHOD WERE
JUST MANDATED, ONLY THE 210-240 2017 AHRI RATING STANDARD WORKED WITH OLDER
OFF-THE-CHARTS PRODUCT.
With new 2SEERS OTC, YOU MUST VERIFY YOUR AHRI NUMBERS ARE SEER1 OR 2.
THE ARHI WEBSITE SHOWS SEER1 RATINGS UNDER THE STANDARD 210-240 2007 M COLUMN
(GREEN CIRCLE)
AS SHOWN BELOW, AND THE SEER2 2023 M1 (RED CIRCLE),
WITH BOTH TESTING METHODS ON SOME.
BE SURE YOU USE
THE CORRECT SEER DATA, EITHER "M" , OR "M1" COLUMNS, (see AHRI directory screenshot
below) WITH ANY Off-the-Charts PRODUCT PRIOR
TO 24.41 YOU CAN ONLY USE SEER1 RATINGS! RESULTS WILL NOT BE COMPLIANT TO ACCA/AHRI/DOE GUIDELINES, AND THE
INSTALLING CONTRACTOR ALWAYS BEARS THE LIABILITY ON ANY MISTAKES.
KR SERVICES, dba KR-SERVICES-COM LLC, and it's vested owners or users would be
held-harmless in such situations.
THE GOOD NEWS IS,
REGARDLESS WHETHER OR NOT THIS NEW RATING STAYS WITH US,
NOW YOU HAVE THE ABILITY TO USE
OTC FOR IT!
Use this link to AHRI directory
for verifications.
------------------------------------------------------
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'S MODELING TOOL.
This industry seems insistent on just doing their own thing with
Manual S, even with $$
load-calc software.
THIER NEW "ONLINE" EQUIPMENT
CALCULATORS OFTEN DON'T MATCH THEIR OWN PRINTED DATA!
We hear you ask:
1. Why would I ever need "Manual S"?
Well first, ICC code dictates it. The majority of
States enforce it.
2. What's it for?
It's used AFTER the load calculation, to
select equipment, and optimize it to your project.
3. Why not just use the model # ?
Model numbers barely give a clue on real
BTU capacity.
5. Usn't AHRI giving the capacity?
NO, the 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, getting the settings right to match your humidity load, and size
the ducts right.
5. I think I have Manual S in my software already, why
pay for this?
BECAUSE NOBODY DOES THIS BETTER!
WE DID THIS FIRST, YOU CAN
FACT-CHECK THAT!
NO ONE ELSE HAD A CHART-LESS "MANUAL- S" IN THEIR PRODUCT IN 2012, UNTIL THEY
SAW OFF-THE-CHARTS, AND
THEN JUST GAMED THEIR PRODUCT TO KEEP UP.
We find current popular software is
time consuming, over complex to use, missing pieces of ACCA's guidelines, and NOT
compliant to their intent. Some crudely added the feature recently by R&D (rip-off
& duplicate), just to compete with OTC.
**************************************
More frequently Asked Questions about
OTC (Click the star) 
**************************************
The 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:
**************************************
Version detail, install trial, purchase or
update:
Click the star
**************************************
Why Use OTC instead of ACCA method?
Click the star
**************************************
Videos for program usage
Click the star
**************************************
The science of "Equipment Selection"
Click the star
**************************************
Compliance of OTC with Codes
and Other Standards
Click the star
**************************************
Using OTC with Elite's Rhvac program
Click the star
**************************************
approved by ACCA Manual S
3/21/25 | 
KR-Services-com LLC 
