# ASHRAE 365 vs IHWAP Diagnostics

The clearest difference is review sentiment: IHWAP Diagnostics at 100% against ASHRAE 365's 0%. IHWAP Diagnostics also leads on rating (5.0 vs 4.2) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

IHWAP Diagnostics holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 10 and 5 respectively. Written reviews point the same way: 0% of ASHRAE 365's written reviews are positive against 100% of IHWAP Diagnostics's.

ASHRAE 365 ships an update every 4 months, IHWAP Diagnostics every 5 months. The most recent releases landed on October 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ASHRAE 365 | IHWAP Diagnostics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (10 ratings)](https://appshunter.io/ios/app/ashrae-365/id1337759799/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ihwap-diagnostics/id1618558493/reviews)** |
| Number of ratings | **10** | 5 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Ad-supported | **Free** |
| Size | 53 MB | 75 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ASHRAE, Inc.](https://appshunter.io/developer/375374912) | [Travis Jenkins](https://appshunter.io/developer/1618558495) |

## What reviewers say

### ASHRAE 365

[App page](https://appshunter.io/ios/app/ashrae-365/id1337759799)

Access ASHRAE information year-round. Stay updated on global conferences and events, connect with the community via social media, and discover resources to support the Society.

**Highlights:** Conference and event updates, Social media integration, Resource discovery, Society support information, Year-round access

**Features:** Vision Pro support

**In-app purchases:** none


### IHWAP Diagnostics

[App page](https://appshunter.io/ios/app/ihwap-diagnostics/id1618558493)

This application assists with home weatherization by quantifying air leakage, calculating ventilation needs, and assessing duct system pressure against program standards. It helps prioritize air sealing and ensures compliance with energy efficiency guidelines.

**Highlights:** Zone Pressure Diagnostics (ZPD), Total External Static Pressure (TESP) calculation, ASHRAE ventilation requirements, Leakage reduction potential estimation, ENERGY STAR compliance checks

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ASHRAE 365 free?

ASHRAE 365 is free to download, with no in-app purchases.

### Is IHWAP Diagnostics free?

IHWAP Diagnostics is free to download, with no in-app purchases.

### Which has better reviews, ASHRAE 365 or IHWAP Diagnostics?

IHWAP Diagnostics is rated higher. ASHRAE 365 averages 4.2 out of 5 from 10 ratings, while IHWAP Diagnostics averages 5.0 from 5 ratings.

### Do ASHRAE 365 or IHWAP Diagnostics have ads?

Neither ASHRAE 365 nor IHWAP Diagnostics shows ads.

### Which is updated more often, ASHRAE 365 or IHWAP Diagnostics?

ASHRAE 365 ships an update every 4 months, and IHWAP Diagnostics every 5 months. Most recently, ASHRAE 365 was updated on October 27, 2026 and IHWAP Diagnostics 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.*