Heat Load Calc HVAC
Cooling & Heating BTU/h
$0.99 · In‑App Purchases · Designed for iPad. Not verified for macOS.
Heat Load Calc HVAC - professional NEC calculator for electricians. Offline, permit-ready.
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.
Ratings & Reviews
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)
The developer, Rizvan Adzhoian, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Rizvan Adzhoian
- Size
- 31 MB
- Category
- Utilities
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- In-App Purchases
Yes
- Pro Unlock $2.99
- Copyright
- © 2026 Rizvan Adzhoian