# HVAC Psych HD vs MSG View

The clearest difference is price: MSG View at $1.99 against HVAC Psych HD's $29.99. MSG View also leads on update cadence (every 4 months vs every 9 months). HVAC Psych HD's advantage is iOS requirement (13.0 vs 17.0). On review sentiment, ads, in-app purchases and monetization model there is nothing between them.

HVAC Psych HD costs $29.99 and MSG View $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HVAC Psych HD ships an update every 9 months, MSG View every 4 months. The most recent releases landed on June 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | HVAC Psych HD | MSG View |
| --- | --- | --- |
| Price | $29.99 | **$1.99** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 2 MB | 7 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Matrix Logic Corporation](https://appshunter.io/developer/303074412) |

## What reviewers say

### HVAC Psych HD

[App page](https://appshunter.io/ios/app/hvac-psych-hd/id582857321)

An interactive psychrometric chart application for iPad, allowing users to plot and customize HVAC processes. Save, email, and manage unlimited projects with both IP and SI units.

**Highlights:** Interactive psychrometric chart, IP and SI unit support, Customizable chart appearance, Finger-based plotting and editing, Save and email charts/data, Unlimited project creation, Zoom and pinch functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### MSG View

[App page](https://appshunter.io/ios/app/msg-view/id6741166769)

Easily view Microsoft Outlook .msg files and their attachments directly on your iOS device. This app allows you to open saved emails from other applications, share attachments, or print them. You can also compose new emails using the content of your MSG files.

**Highlights:** Open .msg email files, View email attachments, Share attachments with other apps, Print attachments, Compose new emails from MSG content, Open sample MSG files

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Psych HD free?

HVAC Psych HD costs $29.99, with no in-app purchases.

### Is MSG View free?

MSG View costs $1.99, with no in-app purchases.

### Do HVAC Psych HD or MSG View have ads?

Neither HVAC Psych HD nor MSG View shows ads.

### Which is updated more often, HVAC Psych HD or MSG View?

HVAC Psych HD ships an update every 9 months, and MSG View every 4 months. Most recently, HVAC Psych HD was updated on June 19, 2026 and MSG View on September 17, 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.*