# Heat Load Calc HVAC — Cooling & Heating BTU/h

> HVAC heat load calculator for cooling and heating BTU/h based on ACCA Manual J. (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/heat-load-calc-hvac/id6764647208 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 17+
- Requires: iOS 13.0 · 30 MB
- Languages: American English
- Released: 2026-05-04
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/heat-load-calc-hvac/id6764647208/reviews.md

## What is Heat Load Calc HVAC?

HVAC Heat Load BTU Calculator helps HVAC technicians, engineers, and contractors calculate accurate cooling and heating loads. Calculate accurate cooling and heating loads using a simplified ACCA Manual J methodology based on room dimensions, insulation levels, window types, and ASHRAE climate zones - the industry standard for professional air conditioning system sizing.

LOAD CALCULATION MODES:
Cooling Mode - Calculate BTU/h cooling requirement for air conditioning
Heating Mode - Calculate BTU/h heating requirement for furnace and heat pump sizing
Automatic Tonnage Conversion - Get AC tonnage (0.5 to 5+ tons) from load results
CFM Requirement - See required airflow for proper system balance

ROOM PARAMETERS:
Room Dimensions - Enter length, width, and ceiling height
Insulation Levels - Poor, Average, Good, or Excellent with correction factors
Window Types - Single Pane, Double Pane, Triple Pane, Low-E glass options
Climate Zones - 5 zones from Hot to Cold with design temperatures
Occupant Load - Account for sensible heat from building occupants

COMPONENT BREAKDOWN:
See loads from walls (exterior and interior)
Window gain/loss calculations
Ceiling and roof heat gain
Floor infiltration and air leakage
Occupant sensible heat contribution
Component-by-component analysis for system design

OPTIONAL PRO UPGRADE — $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience

WHY HVAC PROS USE THIS CALCULATOR:
Faster Manual J estimates than spreadsheets or online calculators
Accurate BTU sizing prevents oversized/undersized systems
Reduces callbacks from incorrect system selection
Quick cooling load checks on service calls
ASHRAE-compliant Manual J methodology for commercial work
Improves customer confidence with detailed technical reports

PERFECT FOR:
HVAC design engineers sizing air conditioning systems
HVAC field technicians quick-checking load requirements
AC contractors preparing accurate equipment bids
HVAC apprentices learning Manual J methodology
Building maintenance engineers planning replacements
Residential and commercial HVAC system sizing
Energy auditors estimating cooling needs

Based on simplified ACCA Manual J design methodology.

Part of HVACTools Suite - the professional HVAC technician app for field calculations, refrigeration diagnostics, and air conditioning system design.

## Key features

- Cooling and heating load calculations
- Simplified ACCA Manual J methodology
- Room dimension and component analysis
- Automatic tonnage conversion
- CFM requirement calculation
- Optional Pro upgrade for advanced features

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Chart rankings

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


## Frequently asked questions about Heat Load Calc HVAC

### What is the primary function of Heat Load Calc HVAC?

Heat Load Calc HVAC is designed to help HVAC professionals calculate accurate cooling and heating loads in BTU/h. It utilizes a simplified ACCA Manual J methodology, which is an industry standard for professional air conditioning system sizing.

### What information is needed to perform a calculation in Heat Load Calc HVAC?

To perform a calculation, you will need to input room dimensions (length, width, height), insulation levels, window types, and the relevant ASHRAE climate zone. The app also accounts for occupant load.

### Does Heat Load Calc HVAC offer different calculation modes?

Yes, Heat Load Calc HVAC offers distinct modes for calculating cooling requirements (BTU/h for air conditioning) and heating requirements (BTU/h for furnace and heat pump sizing). It also provides automatic tonnage conversion and CFM requirements.

### What features are included in the optional Pro upgrade for Heat Load Calc HVAC?

The optional Pro upgrade, available as a $2.99 one-time in-app purchase, provides unlimited saved calculation history, PDF export of results, a dark theme, and an ad-free experience.

### How does Heat Load Calc HVAC compare to other HVAC calculation methods?

HVAC professionals use this calculator for faster Manual J estimates compared to spreadsheets or online calculators. Its accuracy helps prevent oversized or undersized systems, reducing callbacks and improving customer confidence.

### Is Heat Load Calc HVAC suitable for both residential and commercial applications?

Yes, the app is perfect for residential and commercial HVAC system sizing. It is used by design engineers, field technicians, contractors, and building maintenance engineers for various applications.

### Does Heat Load Calc HVAC have ads?

Yes, the free version of Heat Load Calc HVAC contains advertisements. Users can opt for an ad-free experience by purchasing the optional Pro upgrade.

### On which devices can I use Heat Load Calc HVAC?

Heat Load Calc HVAC is available for iPhone, iPad, and iPod. It is designed for use on Apple mobile devices.

## Version history (last 2 releases)

### 1.0.4 — 2026-05-18

What's new:
- Updated metadata for clarity per App Store guidelines
- Optional Pro upgrade is a separate one-time in-app purchase (not required for calculator features)

### 1.0.3 — 2026-05-04

No release notes.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

---

*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 2026-08-24.*