249+ iOS apps curated and reviewed
If you already know HVAC Load Calculator Manual J, this is the deeper bench. 249+ hvac load calculator apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.8★ (41) | No | Yes | Oct 2026 | |
| 2 |  | Free | — | No | Yes | Oct 2026 | |
| 3 |  | $0.99 | 5.0★ (1) | Yes | Yes | Oct 2026 | |
| 4 |  | Free | 4.0★ (1) | No | Yes | Jun 2026 | |
| 5 |  | Free | — | No | Yes | Oct 2026 | |
| 6 |  | Free | 5.0★ (1) | No | Yes | Sep 2026 | |
| 7 |  | Free | — | — | No | Sep 2026 | |
| 8 |  | Free | 5.0★ (1) | No | Yes | Sep 2026 |
This app provides professional HVAC load calculations for contractors, offering three levels of accuracy from quick estimates to detailed Manual J calculations. It's designed for field use with an intuitive interface, offline capabilities, and professional report generation.
Calculate accurate cooling and heating loads for HVAC systems using a simplified ACCA Manual J methodology. Input room dimensions, insulation, window types, and climate zones to determine BTU/h requirements for precise system sizing. Features include load calculation modes, component breakdown, and optional pro upgrades for advanced functionality.
