HVAC Load Calculator Manual J

HVAC Load Calculator Manual J

AC, Heat Pump & Furnace Sizing

44 ratings
2 reviews
Free
In-App Purchases

Lowest price: Free 9 months ago (-100%)


Price history


Details

Released
February 2, 2026
Updated
November 5, 2026

Features

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About

This app provides professional HVAC load calculations for field technicians. It offers multiple accuracy levels, from quick estimates to detailed analysis, and supports room measurement via LiDAR. Generate professional PDF reports and document site details.

✓Manual J 8th Edition calculations
✓Three accuracy levels: Simple, Moderate, Pro
✓LiDAR room measurement (iOS 16+)
✓Offline-ready operation
✓Professional PDF reports
✓Site photo documentation
✓iCloud sync across devices
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+1

What's New in HVAC Load Calculator Manual J

1.38.0

November 5, 2026

EQUIPMENT PER SYSTEM Type the unit you plan to install on each system, straight from the nameplate or the AHRI certificate: rated total and sensible capacity, airflow, blower static, heat pump capacity at 47, 17 and 5°F, furnace output. The app places it against that system's Manual S window: single-stage units use the 115% limit, furnaces 140%, and heat pumps get the balance point and the backup heat needed next to your auxiliary kW. Rated figures are checked at rated conditions; add an expanded-performance row at your design temperature for the unqualified check, with sensible capacity. Copy a unit to another system in one tap. Install details (MCA, MOCP, voltage, line set, SEER2, HSPF2, AHRI reference) are kept with the record. Links to the AHRI Directory and the NEEP cold-climate list open in Safari; nothing is copied for you. Under Room & System Loads, on every system card. Plus reliability fixes.

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Subscriptions & In-App Purchases

Pro License

Full Manual J load calcs with branded PDF reports.

$14.991 Year
7 Days trial
How to cancel HVAC Load Calculator Manual J subscription ⁉️

Events

Read more about Two Systems, One House

Two Systems, One House

See what each system needs to heat and cool

Nov 8, 2026 — Dec 8, 2026

Read more about Size a Cold-Climate Heat Pump

Size a Cold-Climate Heat Pump

See heat pump output on your coldest day

Oct 31, 2026 — Nov 30, 2026

User reviews

It’s fast, it’s easy and from doing it manually, it’s actuate!

The title says it all.

Response from developer

Thank you for the great feedback! We plan to continue adding features to make it more useful to you and the rest of our users. Feel free to submit any ideas for new features to mike@hvacloadcalculator.online

ONLY WORKS IN SIMPLE MODE

If you try to add moderate inputs, like actual sq ft of windows per direction, it kicks out an error and asks you to reload app. This happened to me three times. I’m done. 😡 DO NOT DOWNLOAD! You DO NOT need the headache.

Response from developer

Hello! We are sorry you ran into this issue! We connected over email yesterday and were able to push an update the same night to get everything working correctly for all users. We really appreciate you reaching out. To catch issues like this faster in the future, we're adding an opt-in feature that lets you anonymously share bug reports. You were actually the first to pass along an issue, so your feedback made the app better for everyone. Thanks for taking the time.

Developer apps

FAQ

What is HVAC Load Calculator Manual J?

HVAC Load Calculator Manual J is a mobile application designed for HVAC professionals to perform accurate load calculations for AC, heat pumps, and furnaces. It follows the ACCA Manual J 8th Edition methodology for detailed analysis.

Does HVAC Load Calculator Manual J have ads?

No, HVAC Load Calculator Manual J does not contain advertisements. The app is free to download and use, with optional in-app purchases for advanced features or subscriptions.

What are the different calculation modes in HVAC Load Calculator Manual J?

HVAC Load Calculator Manual J offers three levels of accuracy: Simple Mode for quick estimates using ZIP code data, Moderate Mode for standard replacement jobs with component-level factors, and Pro Mode for detailed whole-house block load calculations with full MJ8 detail.

Can HVAC Load Calculator Manual J measure rooms automatically?

Yes, on LiDAR-equipped iPhone and iPad Pro models running iOS 16 or later, HVAC Load Calculator Manual J can measure rooms automatically. Simply walk through each room, and the app captures floor area, ceiling heights, windows, and exterior walls.

What kind of reports can I generate with HVAC Load Calculator Manual J?

You can generate professional PDF reports that include detailed load calculations, recommended equipment sizing, and site documentation. These reports can be customized with client information and include a photo appendix.

Is HVAC Load Calculator Manual J available offline?

Yes, HVAC Load Calculator Manual J is designed with an offline-first approach. All calculations run locally on your device, meaning you can use it even without an internet signal, which is ideal for field work.

What subscription plans are available for HVAC Load Calculator Manual J?

HVAC Load Calculator Manual J offers several subscription plans, including Annual Pro with Trial options starting at $4.99/year and Pro Quarterly at $9.99/3 months. All plans include a 7-day free trial.

How often is HVAC Load Calculator Manual J updated?

The latest version of HVAC Load Calculator Manual J is 1.37.0, which was last updated on November 2, 2026. Updates typically include new features, bug fixes, and improvements to calculation accuracy and user experience.