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 - Airflow from the supply-air temperature difference, around 400 CFM per ton ROOM PARAMETERS: Room Dimensions - Enter length, width, and ceiling height Exterior Walls - Count how many of the room's walls face outdoors Insulation Levels - Poor, Average, Good, or Excellent, mapped to assembly U-factors Window Types - Single Pane, Double Pane, Triple Pane, Low-E, with U-factor and SHGC Window Orientation - North, East, South, West or mixed exposure for solar gain Floor Type - Over conditioned space, over crawlspace/garage, or slab on grade Climate Zones - 5 zones with ASHRAE design temperatures, overridable by hand Duct Location - Add duct gain/loss when the ducts run through unconditioned space Occupant Load - Sensible and latent heat from building occupants COMPONENT BREAKDOWN: Wall conduction load Window conduction and SHGC-based solar gain, shown separately Ceiling and roof heat gain Floor and slab-perimeter load Infiltration load from envelope tightness Occupant sensible and latent heat Duct gain/loss in unconditioned space Sensible and latent totals, tonnage, airflow and BTU/h per sq ft 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 ACCA Manual J design methodology: assembly U-factors, SHGC-based solar gain, ASHRAE design conditions, and no arbitrary safety padding. Part of HVACTools Suite - the professional HVAC technician app for field calculations, refrigeration diagnostics, and air conditioning system design.

Ratings & Reviews

  • 5.0
    out of 5
    2 Ratings

What's new — the load calculation was rebuilt for accuracy: - Assembly U-factors for walls, ceiling and floor replace the single generic coefficient - Solar gain now comes from the window SHGC and its orientation, not from the U-factor - ASHRAE design temperatures per climate zone, with a manual override for your own design conditions - Sensible and latent loads reported separately, plus floor and duct loads - Airflow now follows the supply-air temperature difference (about 400 CFM per ton) - Added inputs: exterior wall count, window orientation, floor type, ducts in unconditioned space - Heating results no longer report tonnage, which is a cooling-only unit Faster cold start: analytics and the ads SDK no longer block the first screen.

Version 1.0.5

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

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
Rizvan Adzhoian
Size
35.5 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.
Languages
English
Age Rating
18+
In-App Purchases
Yes
Copyright
© 2026 Rizvan Adzhoian
  • Developer Website
  • Privacy Policy

    • More by Rizvan Adzhoian

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