# HVAC Pipe Sizer vs ASHRAE Psychrometric Chart

The clearest difference is price: HVAC Pipe Sizer at $4.99 against ASHRAE Psychrometric Chart's $19.99. HVAC Pipe Sizer also leads on review sentiment (71% vs 27%). ASHRAE Psychrometric Chart's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 17.0). On update cadence, ads, monetization model and device support there is nothing between them.

HVAC Pipe Sizer costs $4.99 and ASHRAE Psychrometric Chart $19.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase. ASHRAE Psychrometric Chart asks for nothing beyond the download.

HVAC Pipe Sizer ships an update every 8 months, ASHRAE Psychrometric Chart every 11 months. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | ASHRAE Psychrometric Chart |
| --- | --- | --- |
| Price | **$4.99** | $19.99 |
| Positive reviews | **71.4% of reviews** | 27.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 11 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 2 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [ASHRAE, Inc.](https://appshunter.io/developer/375374912) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-liquid/id325069065)

Calculate pipe sizes for liquid systems, including hot and chilled water. Input flow rate, head loss, diameter, or velocity to determine other properties. Supports various liquids, pipe materials, and fittings, with English or metric units.

**Highlights:** Liquid pipe sizing, Hydronic system calculations, Input flow, head loss, diameter, or velocity, Calculate fluid flow and head loss, Supports various liquids and pipe materials, English and metric unit options, Email results

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

**In-app purchases (1)**

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


### ASHRAE Psychrometric Chart

[App page](https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008)

This interactive tool allows users to plot and customize psychrometric charts on their iPad. Easily create and save HVAC process graphs, update properties dynamically, and share charts and data via email. Supports both IP and SI units.

**Highlights:** Interactive psychrometric chart plotting, Customizable chart appearance, Dynamic property updates, Create and edit points and labels, Email charts and data, Unlimited projects and templates, Zoom and pinch functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $4.99, and also offers in-app purchases.

### Is ASHRAE Psychrometric Chart free?

ASHRAE Psychrometric Chart costs $19.99, with no in-app purchases.

### Do HVAC Pipe Sizer or ASHRAE Psychrometric Chart have ads?

Neither HVAC Pipe Sizer nor ASHRAE Psychrometric Chart shows ads.

### Which is updated more often, HVAC Pipe Sizer or ASHRAE Psychrometric Chart?

HVAC Pipe Sizer ships an update every 8 months, and ASHRAE Psychrometric Chart every 11 months. Most recently, HVAC Pipe Sizer was updated on October 27, 2026 and ASHRAE Psychrometric Chart on October 12, 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.*