Comparison

HVAC Toolkit Ultimate vs AirPro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HVAC Toolkit Ultimate

This comprehensive application offers a suite of tools for HVAC professionals, including load calculations, equipment tracking, refrigerant charts, duct and pipe sizing, and psychrometric analysis. It consolidates multiple functionalities into a single, powerful utility for field and office use.

Highlights
  • Residential load calculations
  • Equipment nameplate data tracking
  • Refrigerant pressure-temperature charts
  • Superheat and subcool calculations
  • Duct and pipe sizing analysis
  • Psychrometric calculations
  • Steam table property calculations
Features
Read full description

This may just be the only HVAC app you will ever need. The HVAC Toolkit Ultimate from Carmel Software is a universal app that works on both the iPhone and iPad. It is the essential app for anyone in the HVAC industry. It is a compilation of most of the individual iPhone and iPad applications offered by Carmel Software plus bonus software. If you bought each of these apps separately, it would cost more than 2 times what the price of this app is. It includes: 1. HVAC Residential Load Calc HD (iPad version) 1. HVAC Residential Load Calcs (iPhone version) 1. HVAC Equipment Locator 2. HVAC PT Chart 3. HVAC Refrigerant Charge 4. HVAC Duct Sizer 2. HVAC Quick Load 6. ASHRAE Ventilation Calcs (iPhone version) 7. Psychrometrics 8. Steam Tables 9. HVAC Pipe Sizer - Liquid 10. HVAC Pipe Sizer - Steam 11. HVAC Pipe Sizer - Gas Low 12. HVAC Pipe Sizer - Gas High The "HVAC Residential Load Calcs" module allows you to perform comprehensive HVAC block and room-by-room load calculations for small commercial and residential buildings. You can easily use this module out in the field by taking advantage of the simplicity and power of the iPhone or iPad, and then email results back to your office. The "HVAC Equipment Locator" module allows you to track, share, and customize your equipment nameplate and maintenance data. The version here includes the ability to customize your input screens (this is usually an in-app purchase on the free stand-alone version of Locator, but it is included here). The "HVAC PT Chart" module allows you to easily view the pressure-temperature properties of 100 refrigerants. Think of this app as a digital version of the paper PT charts that you may have carried around with you in the past. The "HVAC Refrigerant Charge" module allows you to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure-temperature data for over 100 common refrigerants including azeotropic (bubble/dew) versions of refrigerants. The "HVAC Duct Sizer" module allows you to perform quick and simple duct sizing analysis. You can specify the total airflow in CFM (or L/s), the aspect ratio and one of either the velocity of air or the friction loss per 100 feet (30 meters). The results include both the exact and rounded height and width (or diameter) dimensions and the calculated velocity and friction loss. In addition, you can calculate for a range of duct sizes by specifying minimum and maximum friction loss and airflow values. The "HVAC Quick Load" module allows you to quickly calculate total heating and cooling loads for a wide variety of building types. The "Psychrometrics" module allows you to easily perform single-state and mixed-air HVAC psychrometric calculations for up to 23 different combinations of input parameters. The "Steam Tables" module allows you to calculate the properties of saturated or superheated steam by specifying 2 input properties. This module is also part of the "Pipe Sizer - Steam" module discussed below. The "ASHRAE Ventilation Calcs" module allows you to perform comprehensive minimum ventilation calculations for a wide variety of commercial buildings based upon ASHRAE Standard 62.11-2007 and 2010/2013 versions. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run for many different types of liquids (or fluids), pipe material and fitting types. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Gas Low and Gas High" modules allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. All values can be displayed in English (IP) and Metric (SI) units. We also offer all of the above modules as individual apps, too.

About

AirPro

This tool helps you calculate the right size for air conditioners, heat pumps, and furnaces. It provides detailed analysis of heating and cooling costs, energy consumption, and temperature data. You can also evaluate domestic hot water needs and financial aspects like payback periods.

Highlights
  • BTU estimation for HVAC systems
  • Monthly heating and cooling cost calculation
  • Energy consumption and temperature analysis
  • Domestic hot water needs evaluation
  • Financial analysis including payback periods
  • Data export to CSV and PDF reports
Features
Read full description

Welcome to AirPro, a user-friendly tool for everyone that wants to install an air conditioner, heat pump or any type of furnace. AirPro will assist you in finding the right size of the unit, showing you monthly costs for heating and cooling and domestic hot water, monthly energy consumption, monthly and daily temperatures. Beside the BTU estimation, it allows you to experiment with various base temperatures, heating and cooling temperatures, and smart schedules for system off, providing a custom-tailored approach that suits every individual's needs. You will have all the data for the daily, monthly and annual electricity consumption, energy production, electricity cost, heating degree days, cooling degree days and much more. If you are using a Gas Furnace, you will obtain the analysis for gas burned through the year, gas cost per Therms, kWh, m3, Mcf or Gallons. If you are using an Oil Furnace, you will obtain the analysis for daily (monthly/ annual) usage of oil in Liters (Litre) or Gallons. Also we covered the Wood Furnace, and you will have the results in m3 or Cords. But that's just the tip of the iceberg. AirPro's expansive features present an array of system evaluations, encompassing Heat Pumps, Air Conditioners, Electric Heaters, and Gas, Oil, and Wood furnaces. With this extensive range of options, AirPro ensures you have all the information you need to find the system that aligns best with your circumstances and preferences. Data visualization is made easy and professional with AirPro. It offers high-quality charts for intuitive understanding of your system's performance. Need to share or store this information? No problem. AirPro lets you export your data in a convenient CSV format or create comprehensive PDF reports for any variant. But AirPro isn't just about heating and cooling. It extends its analytical prowess to help you evaluate the domestic hot water needs of various types of premises, whether it's a cozy house, multi-story flats, hospital, hotel, office, or a school. On top of all these features, AirPro brings a powerful financial aspect to the table. It provides detailed financial analysis, giving you a clear picture of daily and monthly thermal energy consumption, financial comparisons, payback periods, and net present value (NPV) calculations. This financial insight empowers you to make informed decisions, not just for the comfort of your space, but also for the health of your wallet. AirPro is more than an app—it's your comprehensive, all-in-one tool for thermal energy analysis. It's designed to be a handy assistant, always ready to provide data-driven insights, ensuring you make well-informed decisions about your heating and cooling systems. Experience the power of smart thermal energy management today with AirPro. If you have any questions or suggestions or you need a technical support, please let us know at support@pvsolcast.com. Terms and Conditions link: https://sites.google.com/view/pvfterms/home Privacy Policy link: https://sites.google.com/view/airpropolicy/home

Screenshots

HVAC Toolkit Ultimate4 screens
AirPro4 screens

Verdict

The call

The clearest difference is price: AirPro at Free against HVAC Toolkit Ultimate's $59.99. AirPro also leads on rating (5.0 vs 3.0) and update cadence (every 4 days vs every 6 months). HVAC Toolkit Ultimate's advantage is in-app purchases (none vs 2) and ads (none vs shown). On ratings volume and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

AirPro is free to download; HVAC Toolkit Ultimate costs $59.99 up front. AirPro sells 2 in-app purchases, starting at $7.99 per month. HVAC Toolkit Ultimate asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

AirPro holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 5 respectively.

UpkeepUpdate frequency

HVAC Toolkit Ultimate ships an update every 6 months, AirPro every 4 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
HVAC Toolkit Ultimate versus AirPro: the parameters behind the verdict, then further details
ParameterHVAC Toolkit UltimateAirPro
Price$59.99Free — better
Rating3.0 (4 ratings)5.0 (5 ratings) — better
Positive reviews40.0% of reviews—
Number of ratings45 — better
Update frequencyEvery 6 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size59 MB18 MB
Age rating4+4+
DeveloperCarmel Software CorporationIgor Ilijovski

Customer experience

HVAC Toolkit Ultimate

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews15 reviews
Positive40.0%
Neutral6.7%
Negative53.3%

AirPro

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

HVAC Toolkit Ultimate

No in-app purchases

2 purchases

AirPro

Subscriptions2
  • AirPro Premium - Monthly$7.991 Month
  • AirPro Premium - Annual$29.991 Year

Questions

Is HVAC Toolkit Ultimate free?
HVAC Toolkit Ultimate costs $59.99, with no in-app purchases.
Is AirPro free?
AirPro is free to download, with in-app purchases available.
Which has better reviews, HVAC Toolkit Ultimate or AirPro?
AirPro is rated higher. HVAC Toolkit Ultimate averages 3.0 out of 5 from 4 ratings, while AirPro averages 5.0 from 5 ratings.
Do HVAC Toolkit Ultimate or AirPro have ads?
AirPro shows ads; HVAC Toolkit Ultimate does not.
Which is updated more often, HVAC Toolkit Ultimate or AirPro?
HVAC Toolkit Ultimate ships an update every 6 months, and AirPro every 4 days. Most recently, HVAC Toolkit Ultimate was updated on November 1, 2026 and AirPro on November 3, 2026.

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