# HVAC Psychrometric LT vs EngineerCalc

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.

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.

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.

## The numbers

| Metric | HVAC Psychrometric LT | EngineerCalc |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 60 months |
| Monetization | Paid | — |
| Size | 18 MB | 10 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [oskari saarinen](https://appshunter.io/developer/1234576917) |

## What reviewers say

### HVAC Psychrometric LT

[App page](https://appshunter.io/ios/app/hvac-psychrometric-lt/id348669920)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### EngineerCalc

[App page](https://appshunter.io/ios/app/engineercalc/id1454820389)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*