# ManualJ Lite — HVAC Load Calculator

> HVAC Load Calculator (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/manualj-lite/id6761507693 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities, Productivity
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-04-02
- Data updated: 2026-08-19
- User reviews in markdown: https://appshunter.io/ios/app/manualj-lite/id6761507693/reviews.md

## What is ManualJ Lite?

ManualJ Lite is a fast, offline HVAC load calculator based on the Manual J simplified method. Enter your building details and instantly get cooling and heating load estimates for proper equipment sizing.

WHAT IT CALCULATES:

Cooling Load:
- Sensible and latent cooling loads (BTU/h)
- Total cooling capacity required
- AC tonnage recommendation
- Load breakdown by component

Heating Load:
- Total heating BTU/h
- Heat loss through walls, windows, roof
- Infiltration losses
- Recommended furnace capacity

BUILDING INPUTS:

- 7 IECC climate zones (Zone 1 through Zone 7)
- Floor area in square feet
- Insulation quality (Poor, Average, Good, Excellent)
- Window type (Single, Double, Low-E Double, Triple)
- Number of stories and orientation

KEY FEATURES:

- Simplified Manual J calculation method
- Cooling and heating mode toggle
- Component-level load breakdown percentages
- Instant results as you adjust inputs
- Clean, easy-to-read results layout
- Works completely offline
- No account or login required

BUILT FOR HVAC TECHS:

Whether you are an HVAC technician, contractor, or homeowner planning a system upgrade, ManualJ Lite gives you quick load estimates for equipment sizing. Select your climate zone, enter building specs, and get BTU and tonnage results in seconds.

Covers all 7 IECC climate zones with appropriate design temperatures for accurate residential load calculations.

## Chart rankings

- #193 in Top Paid · Utilities (US App Store)


## Version history (last 3 releases)

### 1.2 — 2026-06-28

Added a More Pro Tools section to discover related field calculators.

### 1.1 — 2026-05-21

Added California Title 24 climate zones (CZ 1-16). Switch between IECC and California Title 24 zone systems from the Climate Zone picker.

### 1.0 — 2026-04-02

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*