Comparison

HVAC Psychrometric LT vs EngineerCalc

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

Head to head
About

HVAC Psychrometric LT

Perform quick and simple single-air stream psychrometric calculations on your iPhone or iPad. Easily select and update input parameters, view results instantly, and export data via email or spreadsheet.

Highlights
  • Single-state HVAC psychrometric calculations
  • Universal app for iPhone and iPad
  • All inputs and results on one screen
  • 23 input parameter combinations
  • Real-time results with slider control
  • Export results via HTML email and spreadsheet
Features
Read full description

The "HVAC Psychrometric LT" app is the #1 selling psychrometric application for the Apple iPhone and iPad. Tens of thousands of happy users have downloaded this useful application for performing quick and simple psychrometric analysis. Just a few reasons why you should buy this application: 1. The Psych LT is a universal app that it is optimized for both the iPhone and iPad. 2. This app was developed by Carmel Software, a company that has been developing software for 20+ years. We are experts in software design and HVAC analysis. 3. It allows you to quickly and easily perform single-state HVAC psychrometric calculations. 4. Select and update all input parameters and view the calculated results all in the same screen without switching from one screen to another. 5. Select from 23 different combinations of any 2 input parameters such as "Humidity Ratio / Dewpoint Temperature" and much more. 6. Immediately view updated results as you change the input values using the on-screen slider control. You can specify how much to increase or decrease values as you slide the indicator along the slider mechanism. 7. Send an HTML email and a spreadsheet attachment of all of the single-state and mixed-air inputs and results 8. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 The following input and output value-types are displayed: 1. Dry-bulb temperature 2. Humidity ratio 3. Relative Humidity 4. Wet-bulb temperature 5. Partial pressure 6. Enthalpy 7. Specific volume 8. Dewpoint temperature 9. Total airflow or mass flow (for mixed-air calcs, only) You can specify additional parameters such as the altitude of the air being analyzed, the atmospheric pressure, different types of units such as degrees F or R, and English or Metric units. The "HVAC Psychrometric LT" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our analysis software and incorporated it into their leading Autodesk Revit software product. In addition, ASHRAE has hired Carmel Software to develop custom mobile apps to accompany their various standards. We also offer the following apps for the iPhone/iPad: 1. HVAC Residential Load Calcs 2. HVAC Load Plus 3. HVAC Duct Sizer 4. HVAC Pipe Sizer – Gas Low Pressure 5. HVAC Pipe Sizer - Gas High Pressure 6. HVAC Pipe Sizer – Liquid 7. HVAC Pipe Sizer – Steam 8. Steam Tables 9. HVAC Toolkit 10. Psychrometric LT 11. HVAC Pipe Sizer Plus 12. HVAC Pipe Sizer Gas Plus 13. HVAC Quick Load 14. HVAC ResLoad-J 15. HVAC Equipment Locator 16. HVAC Psych HD

About

EngineerCalc

Features
Read full description

EngineerCalc is an app for electrical engineers and hobbyists. At the moment, it includes 4 calculators: • CapacitorCalc - Calculate the ripple voltage refusing capacitor capacitance and min. voltage for your AC-DC circuit • InductorCalc - Calculate the inductance, needed wire-length (and resistance of the wire) and Q-value for your diy coil/inductor • LC-TankCircuit - Calculate the 3rd value of your tank-circuit (capacitance, inductance or frequency) • Ohm'sLawCalc - Calculate the 3rd and/or 4th value of an Ohm's law circuit (voltage, current, resistance or power ) The app supports multiple units which you can change by tapping the unit-label: For CapacitorCalc: • Voltage (Volt) - V • Current (Amper) - A • Frequency (Herz) - Hz For InductorCalc: • Distance (Meter) - µm, mm, cm, m, Km • Resistance (Ohm) - pΩ, nΩ, µΩ, mΩ, Ω, KΩ, MΩ, GΩ • Frequency (Herz) - Hz, KHz, MHz, GHz • Inductance (Henry) - pH, nH, µH, mH, H, KH, MH, GH For LC-TankCircuit: • Capacitance (Farad) - pF, nF, µF, mF, F, KF, MF, GF • Inductance (Henry) - pH, nH, µH, mH, H, KH, MH, GH • Frequency (Herz) - Hz, KHz, MHz, GHz For Ohm'sLawCalc: • Voltage unit (Volt) - pV, nV, µV, mV, V, KV, MV, GV • Current unit (Amper) - pA, nA, µA, mA, A, KA, MA, GA • Resistance unit (Ohm) - pΩ, nΩ, µΩ, mΩ, Ω, KΩ, MΩ, GΩ • Power unit (Watt) - pW, nW, µW, mW, W, KW, MW, GW If you have an development suggestion, want to request an unit support or want to report a bug, you can get in touch with me trough my website https://ssl-saario.xyz/AppFiles/html/eCalcHelp.html

Screenshots

HVAC Psychrometric LT4 screens
EngineerCalc4 screens

Verdict

The call

The clearest difference is in-app purchases: EngineerCalc at none against HVAC Psychrometric LT's 1. EngineerCalc also leads on iOS requirement (12.0 vs 15.6). HVAC Psychrometric LT's advantage is update cadence (every 11 months vs every 60 months) and price ($0.99 vs $1.99). On ads 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

HVAC Psychrometric LT costs $0.99 and EngineerCalc $1.99 up front. HVAC Psychrometric LT sells 1 one-off in-app purchase. EngineerCalc asks for nothing beyond the download.

UpkeepUpdate frequency

HVAC Psychrometric LT ships an update every 11 months, EngineerCalc every 60 months. The most recent releases landed on September 21, 2026 and September 15, 2026 respectively.

Scorecard4 real differences · 4 level
HVAC Psychrometric LT versus EngineerCalc: the parameters behind the verdict, then further details
ParameterHVAC Psychrometric LTEngineerCalc
Price$0.99 — better$1.99
Positive reviews75.0% of reviews—
Update frequencyEvery 11 months — betterEvery 60 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size18 MB10 MB
Age rating4+4+
DeveloperCarmel Software Corporationoskari saarinen

In-app purchases

1 purchases

HVAC Psychrometric LT

One-time1
  • HVAC Equipment Locator$9.99
None

EngineerCalc

No in-app purchases

Questions

Is HVAC Psychrometric LT free?
HVAC Psychrometric LT costs $0.99, and also offers in-app purchases.
Is EngineerCalc free?
EngineerCalc costs $1.99, with no in-app purchases.
Do HVAC Psychrometric LT or EngineerCalc have ads?
Neither HVAC Psychrometric LT nor EngineerCalc shows ads.
Which is updated more often, HVAC Psychrometric LT or EngineerCalc?
HVAC Psychrometric LT ships an update every 11 months, and EngineerCalc every 60 months. Most recently, HVAC Psychrometric LT was updated on September 21, 2026 and EngineerCalc on September 15, 2026.

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