# HVACSize — Manual J Load Calculator

> Manual J Load Calculator (iPhone/iPad app by High Intent Labs.)

- Source: https://appshunter.io/ios/app/hvacsize/id6772235078 (this page in markdown: same URL + `.md`)
- Developer: [High Intent Labs](https://appshunter.io/developer/6771761657)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 26.4 · 6 MB
- Languages: American English
- Released: 2026-06-02
- Data updated: 2026-06-27
- User reviews in markdown: https://appshunter.io/ios/app/hvacsize/id6772235078/reviews.md

## What is HVACSize?

Manual J. Without the laptop.

HVACSize runs a residential HVAC load calculation right from your phone — no account, no subscription, works offline. Built for HVAC professionals who need accurate equipment sizing in the field, not rough guesses.

THREE MODES — PICK YOUR PRECISION

Simple — ZIP code + square footage. Ballpark sizing in 60 seconds.
Moderate — Whole-house block load with construction details. ~5 minutes.
Pro — Full ACCA Manual J 8th Edition methodology, the standard the industry runs on. ~15 minutes.

Switch modes anytime. Your data carries over.

RESULTS YOU CAN TRUST

Separate cooling and heating loads with full component breakdown
AC tonnage and furnace BTU output sized to your actual load
Manual S guidance for equipment selection
Climate design conditions from ACCA/ASHRAE data
Imperial or SI units — BTU/kW, ft²/m², °F/°C

BUILT FOR THE JOB SITE

Fully offline — no signal needed on site
Save and manage unlimited projects
Attach site photos to each calculation
Export a branded PDF report with your company name, logo, technician, and legal disclaimer
International support — use a ZIP code or pick any country and city

YOUR DATA STAYS YOURS

No account required, ever
Nothing leaves your device
Export all project data as JSON at any time

Stop oversizing. Stop undersizing.
Right-size equipment — and back it up with a calculation.


## Version history (last 2 releases)

### 1.1 — 2026-06-03

-  We've added analytics to help us improve the application. We don't collect any personal data.

### 1.0 — 2026-06-02

No release notes.

## More apps by High Intent Labs

- [DuctPro](https://appshunter.io/ios/app/ductpro/id6771761655)

All apps by High Intent Labs: https://appshunter.io/developer/6771761657

---

*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 2026-06-27.*