Heat Load Calc HVAC
Cooling & Heating BTU/h
About
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.
What's New in Heat Load Calc HVAC
1.0.4
May 18, 2026
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)
MoreIn-App Purchases
$2.99
Pro Unlock
No ads, unlimited history, PDF export, dark theme.
Developer apps
FAQ
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.