# HVAC Load Plus vs RPN

The clearest difference is price: RPN at $1.99 against HVAC Load Plus's $24.99. RPN also leads on rating (5.0 vs 2.8) and review sentiment (100% vs 60%). On ratings volume, ads, monetization model and device support there is nothing between them.

HVAC Load Plus costs $24.99 and RPN $1.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. RPN asks for nothing beyond the download.

RPN holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 5 and 14 respectively. Written reviews point the same way: 60% of HVAC Load Plus's written reviews are positive against 100% of RPN's.

HVAC Load Plus ships an update every 9 months, RPN every 3 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | HVAC Load Plus | RPN |
| --- | --- | --- |
| Price | $24.99 | **$1.99** |
| Rating | [2.8 (5 ratings)](https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews) | **[5.0 (14 ratings)](https://appshunter.io/ios/app/rpn-34-ce/id1448593029/reviews)** |
| Number of ratings | 5 | **14** |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 18 MB | 16 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [CuVee Software](https://appshunter.io/developer/424873503) |

## What reviewers say

### HVAC Load Plus

[App page](https://appshunter.io/ios/app/hvac-load-plus/id381608273)

Perform detailed heating and cooling load calculations for buildings in the field using your iPhone. Access a vast weather database and construction data to generate comprehensive reports that can be emailed or exported to spreadsheets.

**Highlights:** Detailed heating and cooling load calculations, 1000+ city weather database, Extensive construction type data, Unlimited project creation and storage, Comprehensive load breakdown reports, Emailable HTML reports with spreadsheet attachments, Company information display on reports

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

**In-app purchases (1)**

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


### RPN

[App page](https://appshunter.io/ios/app/rpn-34-ce/id1448593029)

This app simulates a legendary scientific calculator, offering photo-realistic visuals and advanced functions like integration and root finding. It includes built-in programs and extensions for enhanced usability, making it a powerful tool for complex calculations.

**Highlights:** Photo-realistic look-and-feel, Programmable with 999 steps, Integration and root solving, Built-in application programs, Live register view, Program library and backup, Sharing via email, AirDrop, Dropbox

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Load Plus free?

HVAC Load Plus costs $24.99, and also offers in-app purchases.

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Which has better reviews, HVAC Load Plus or RPN?

RPN is rated higher. HVAC Load Plus averages 2.8 out of 5 from 5 ratings, while RPN averages 5.0 from 14 ratings.

### Do HVAC Load Plus or RPN have ads?

Neither HVAC Load Plus nor RPN shows ads.

### Which is updated more often, HVAC Load Plus or RPN?

HVAC Load Plus ships an update every 9 months, and RPN every 3 months. Most recently, HVAC Load Plus was updated on October 27, 2026 and RPN on October 24, 2026.

---

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