Best Heat Load Calculator Apps

208+ iOS apps curated and reviewed

4.0 avg rating
18 free apps
Updated July 2026

Whether you're new to heat load calculator or looking for an upgrade, our curated collection of 208+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Top Picks for Heat Load Calculator

HVAC Load Calculator Manual J#1

HVAC Load Calculator Manual J by Mike Watson

BTU Sizing for Contractors
Editor's Choice
🔧 Utilities
4.7(29 ratings)
FreeIn-App Purchases
HVAC Load Calculator Manual J screenshot 1
HVAC Load Calculator Manual J screenshot 2
HVAC Load Calculator Manual J screenshot 3
HVAC Load Calculator Manual J screenshot 4
HVAC Load Calculator Manual J screenshot 5

This app provides professional HVAC load calculations for contractors, offering three levels of accuracy from quick estimates to detailed Manual J calculations. It's designed for field use with an intuitive interface, offline capabilities, and professional report generation.

Bluon HVAC#2

Bluon HVAC by Bluon, Inc.

HVAC Tools
Strong Contender
🔧 Utilities
4.8😐(4.5K ratings)
FreeAds
Bluon HVAC screenshot 1
Bluon HVAC screenshot 2
Bluon HVAC screenshot 3
Bluon HVAC screenshot 4
Bluon HVAC screenshot 5
Bluon HVAC screenshot 6

Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.

What We Love

  • 🤖 Helpful tech support
  • 💯 Comprehensive database of manuals and information
  • 🛠️ Useful tools and calculators
  • 🤝 Great customer service

Room to Improve

  • 💰 Paywall for advanced features
  • 🔒 Limited access without company account
  • 🔍 Missing manuals for some equipment models
BTU Calculator -  Data Centers#3

BTU Calculator - Data Centers by Cristinel Bontas

Cooling Requirements
Worth Considering
🔧 Utilities
4.6(288 ratings)
FreeAdsIn-App Purchases
BTU Calculator -  Data Centers screenshot 1
BTU Calculator -  Data Centers screenshot 2
BTU Calculator -  Data Centers screenshot 3
BTU Calculator -  Data Centers screenshot 4

Estimate the cooling capacity needed for your data center. This tool considers factors like space, occupants, and heat output to help you maintain optimal temperature and humidity. It provides instant results as you update inputs, serving as a guide for system selection.

More Heat Load Calculator apps to explore

4
HVAC Calculator Load Pro
HVAC Calculator Load Pro
HVAC Calculator Load Pro
Built for HVAC Specialists
Free
$12.99 | 100% OFF

This tool provides fast, accurate HVAC load calculations for residential systems. It helps professionals size furnaces, air conditioners, and gas equipment correctly, avoiding guesswork and spreadsheets for confident client recommendations and more closed bids.

Fast HVAC BTU calculationsResidential furnace & AC sizingClimate-aware calculations
📊 Productivity
(1)
free with in-app purchases
5
AC Calculator - HVAC Sizing
AC Calculator - HVAC Sizing
AC Calculator - HVAC Sizing
Air conditioner or Heat Pump
Free

This utility app simplifies HVAC sizing by calculating BTU/h capacity and recommending equipment. It offers unit conversions, price estimates, and energy consumption comparisons. Advanced features can be unlocked via in-app purchases.

Calculate BTU/h capacityRecommend equipment typesConvert BTU, kW, Kcal, Tons
🔧 Utilities
(20)
free with in-app purchases
6
Blue Cold Heat Load Calculator
Blue Cold Heat Load Calculator
Blue Cold Heat Load Calculator
by Blue Cold Refrigeration Private Limited
Free

Accurately calculate the cooling capacity needed for cold rooms, storage, and freezers. Input room details, insulation, temperatures, and product information for precise, data-driven recommendations. Generate shareable PDF reports for your projects.

Calculate cooling capacityInput room dimensions and insulationDetermine optimal pressure requirements
🔧 Utilities
(1)
free
7
SuperCool Slide Rule HVAC
SuperCool Slide Rule HVAC
SuperCool Slide Rule HVAC
by Designstein, llc
Free

This app offers a comprehensive suite of tools for HVAC technicians. It provides interactive guides, step-by-step repair instructions, and calculators for various HVAC calculations including superheat, subcooling, and duct sizing.

Superheat & Subcooling chargingDuct sizing & layout calculatorCompressor windings troubleshooter
🔧 Utilities
(185)
free
8
HVAC Formulas Tech Calculator
HVAC Formulas Tech Calculator
HVAC Formulas Tech Calculator
Reference for technicians
Free

This app provides a comprehensive collection of HVAC formulas for technicians. It simplifies complex calculations for heating, ventilation, and air conditioning systems, saving time and effort compared to manual methods or general calculators. Designed by an industry professional, it offers an easy-to-use interface for quick access to essential formulas.

Comprehensive HVAC formula collectionFormulas for air, fan laws, and heatSimplified calculations for technicians
🔧 Utilities
(13)
free
9
HVACR Check & Charge
HVACR Check & Charge
HVACR Check & Charge
PT Charts Superheat Subcooling
Free

This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.

Instant refrigerant charge calculatorSuperheat calculator (non-TXV)Subcooling calculator (TXV)
🔍 Reference
(17K)
free
10
Concrete Calculator Plus
Concrete Calculator Plus
Concrete Calculator Plus
by Inch Calculator
Free

This app provides 15 calculators for estimating concrete, blocks, mortar, rebar, and gravel. It supports various shapes and units, offering material cost estimations for construction projects.

15 concrete estimation calculatorsEstimates cubic yards or bagsCalculates material costs
🔧 Utilities
(21K)
ad-supported
11
Powrmatic Heating Load Calculator
Powrmatic Heating Load Calculator
Powrmatic Heating Load Calculator
by Powrmatic Limited
Free

Calculate the heating load for simple rectangular buildings with natural air infiltration. Save calculations for future reference or email them directly from the app.

Calculate heating loadSimple rectangular building supportBrick/block or sheet construction
🔧 Utilities
(1)
free
12
SwiftSize
SwiftSize
SwiftSize
Quick Heat Load Calculator
$9.99

This HVAC tool quickly calculates residential heating and cooling loads on-site. It streamlines the process for professionals, allowing for faster equipment sizing and more customer consultation time. Generate shareable PDF reports of your calculations.

Quick heat load calculationsOn-site measurementsAccurate equipment sizing
💼 Business
(3)
paid
13
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
Calculates everything. Try it.
Free

This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.

Over 40 calculators and unit convertersStandard and scientific calculator functionsFinancial calculators (interest, loan, currency)
📊 Productivity
(4.8K)
free with in-app purchases
14
Heat Safety
Heat Safety
Heat Safety
Heat Conditions and Forecasts
Free

This tool helps prevent heat-related illnesses for outdoor workers by providing heat index and wet bulb temperature data. It offers current conditions and forecasts for US locations, using standardized risk level categorizations to help plan work activities and ensure safety.

Heat index and wet bulb temperatureCurrent conditions and forecastsOSHA-NIOSH and US Army risk levels
☀️ Weather
(1.8K)
free with in-app purchases
15
Aircool® HeatCalc
Aircool® HeatCalc
Aircool® HeatCalc
Heating load calculation
Free

Calculate heating loads for various scenarios, including construction, product, and infiltration. Generate and download detailed PDF reports of your calculations for free. Save important results online to your account.

Heating load calculationChamber parameter inputProduct parameter input
🔧 Utilities
(1)
free
16
Voltage Drop Calculator.
Voltage Drop Calculator.
Voltage Drop Calculator.
Wire Size, NEC & IEC Tools
Free

Calculate voltage drop and wire size using both NEC and IEC standards. Supports various load types, conductor materials, and system configurations. Generates detailed reports for electricians, engineers, and contractors.

NEC and IEC dual standardsVoltage drop and wire sizing calculationsSupport for continuous load and corrections
🔧 Utilities
(411)
free with in-app purchases
17
HVAC Residential Load Calcs
HVAC Residential Load Calcs
HVAC Residential Load Calcs
Calculate cool/heat loads...
$34.99

Perform detailed residential heating and cooling load calculations in the field. This app offers extensive data on building materials, weather, and project management for HVAC engineers and technicians.

Block and room-by-room load calculations1000+ city weather databaseExtensive construction material data
💼 Business
(3)
paid
18
Electric heating calculator
Electric heating calculator
Electric heating calculator
Heat Energy Calculator
Free
📊 Productivity
(0)
19
OSHA-NIOSH Heat Safety Tool
OSHA-NIOSH Heat Safety Tool
OSHA-NIOSH Heat Safety Tool
by Centers for Disease Control and Prevention
Free

This tool helps outdoor workers stay safe by providing real-time heat index information and hourly forecasts specific to their location. It offers occupational safety recommendations and details on heat-related illnesses and their first aid.

Real-time heat index and risk levelsHourly heat index forecastOccupational safety recommendations
☀️ Weather
(292)
free
20
BTU Calculator - Air Conditioner
BTU Calculator - Air Conditioner
BTU Calculator - Air Conditioner
by Queen Mob
Free

This utility helps you determine the appropriate cooling capacity for an air conditioner based on room size and other factors. It simplifies the process of selecting the right unit to ensure optimal comfort and energy efficiency.

BTU calculationAir conditioner sizingRoom dimension input
🔧 Utilities
(5)
free

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