ASHRAE 365 vs IHWAP Diagnostics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ASHRAE 365
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.
- Conference and event updates
- Social media integration
- Resource discovery
- Society support information
- Year-round access
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ASHRAE 365 is your year-round app for ASHRAE information. Stay up-to-date on upcoming worldwide conferences and events, connect with others through social media, find resources, and learn how to support the Society.
IHWAP Diagnostics
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.
- Zone Pressure Diagnostics (ZPD)
- Total External Static Pressure (TESP) calculation
- ASHRAE ventilation requirements
- Leakage reduction potential estimation
- ENERGY STAR compliance checks
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Illinois Home Weatherization Assistance Program (IHWAP) Diagnostics application for the University of Illinois. This app is the product of a collaboration between the Indoor Climate Research & Training Center’s Senior Weatherization Trainer, Nate Price, and me. The Zone Pressure Diagnostics (ZPD) function will quantify the connection between the house and a zone and between that zone and the outdoors. It will also estimate the total leakage reduction potential in the zone, which should assist with prioritizing air sealing measures. The Total External Static Pressure (TESP) function will calculate total pressure and the pressure caused by the various components of a duct system and compare them to Illinois Home Weatherization Assistance Program (IHWAP) standards for recommended replacement options. The American Society of Heating and Air-Conditioning Engineers (ASHRAE) function will calculate home ventilation requirements ensuring proper pollutant control and ENERGY STAR compliance.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ASHRAE 365 | IHWAP Diagnostics |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (10 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 5 |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 53 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | ASHRAE, Inc. | Travis Jenkins |
Customer experience
ASHRAE 365
IHWAP Diagnostics
In-app purchases
ASHRAE 365
No in-app purchases
IHWAP Diagnostics
No in-app purchases
Questions
Is ASHRAE 365 free?
Is IHWAP Diagnostics free?
Which has better reviews, ASHRAE 365 or IHWAP Diagnostics?
Do ASHRAE 365 or IHWAP Diagnostics have ads?
Which is updated more often, ASHRAE 365 or IHWAP Diagnostics?
Other comparisons
