# HVAC Visual Learning Studio — HVAC Calculators & Visual Lab

> HVAC Calculators & Visual Lab (iPhone/iPad app by Yuhsiu Lai.)

- Source: https://appshunter.io/ios/app/hvac-visual-learning-studio/id6765779251 (this page in markdown: same URL + `.md`)
- Developer: [Yuhsiu Lai](https://appshunter.io/developer/433114647)
- Category: Education, Reference
- Price: $2.99 (on sale, was $9.99)
- Age rating: 4+
- Requires: iOS 17.0 · 146 MB
- Languages: American English
- Released: 2026-05-04
- Data updated: 2026-09-15
- User reviews in markdown: https://appshunter.io/ios/app/hvac-visual-learning-studio/id6765779251/reviews.md

## What is HVAC Visual Learning Studio?

HVAC Visual Learning Studio is the engineering toolkit, refrigerant database, animated simulation lab, and visual reference library that working HVAC engineers actually use.

This is NOT a generic learning template. Every screen — calculators, refrigerants, simulators, illustrations, projects — is specifically built around the daily work of HVAC design, troubleshooting, and controls.


WHAT MAKES THIS APP DIFFERENT

→ HVAC ENGINEERING CALCULATORS (NEW in v3.0)
Eight production-ready calculators with live sliders:
- Sensible heat load (q = 1.08 × CFM × ΔT)
- Latent heat load (q = 4840 × CFM × ΔW)
- Mixed air temperature
- Duct sizing (equal-friction method)
- Pump friction head loss
- Refrigerant superheat & subcooling diagnostic — with charge interpretation
- Annual cost of operation from EER, tonnage, and electricity rate
- Sensible Heat Ratio classifier

Every input drives the result live. No spreadsheet required.

→ REFRIGERANT DATABASE (NEW in v3.0)
Nine common refrigerants compared side-by-side:
R-22, R-410A, R-134a, R-32, R-454B, R-1234yf, R-290 (propane), R-744 (CO₂), R-717 (ammonia).

For each: ASHRAE 34 safety class, GWP, ODP, critical properties, typical operating pressures, applications, and engineering notes. Filter by family — HFC, HFO, blend, or natural. Tap any card for the full datasheet.

→ HVAC SIMULATION LAB
Four animated simulators built specifically for HVAC:
- AHU Simulator — airflow particles, spinning supply fan, modulating dampers, virtual zone thermostat
- Refrigeration Cycle on a P-h diagram with live COP and EER
- Psychrometric Chart with live state plotting and process lines
- Chiller Plant with staging logic, cooling tower, animated water flow

→ ILLUSTRATED REFERENCE GALLERY
56 high-resolution HVAC diagrams across 11 categories: whole-house residential, multi-unit, commercial, industrial, ventilation, controls, documentation. Full-screen viewer with pinch-zoom.

→ CURRICULUM
Six modules: HVAC Fundamentals, Psychrometrics, Refrigeration, Air Distribution, Hydronics, and Controls/DDC. Lessons include code examples, quizzes, and bookmarks.

→ DESIGN PROJECTS
Six worked examples: residential Manual J, single-zone RTU sequences, VAV with reheat and pressure reset (ASHRAE Guideline 36), chiller plant design, school DOAS+ERV, heat-recovery VRF.

→ SEARCHABLE REFERENCE
Psychrometric equations, refrigerant properties, ASHRAE standards summaries, BACnet object types — searchable by keyword.


BUILT FOR

- HVAC design engineers running daily calculations
- Building automation and DDC professionals
- Energy auditors and commissioning agents
- HVAC technicians studying for NATE, EPA 608, or PE exams
- Mechanical engineering students
- Architects who want to actually understand the systems they spec


WHAT'S NEW IN v3.0

- HVAC Calculators tab — 8 engineering calculators (new tab on the bottom bar)
- Refrigerants tab — 9-refrigerant searchable database (new tab on the bottom bar)
- What's New screen on first launch highlighting the new features
- Updated illustrated gallery to 56 diagrams across 11 categories


This app is an educational reference. Always verify with current ASHRAE standards, manufacturer data, and local codes before designing or installing equipment.


## Version history (last 3 releases)

### 3.0 — 2026-05-18

Version 3.0 — HVAC Calculators + Refrigerants Database

This release adds two major HVAC-specific features that make this app a genuinely useful daily tool for working engineers and technicians:

NEW — HVAC CALCULATORS TAB
Eight engineering calculators every HVAC designer runs constantly:
- Sensible heat load (q = 1.08 × CFM × ΔT)
- Latent heat load (q = 4840 × CFM × ΔW)
- Mixed air temperature blender
- Duct sizing (equal-friction method)
- Pump friction head loss
- Refrigerant superheat / subcooling diagnostic with charge interpretation
- Annual cost of operation
- Sensible Heat Ratio classifier
Every input is a slider — results update live.

NEW — REFRIGERANTS TAB
Side-by-side database of 9 common refrigerants (R-22, R-410A, R-134a, R-32, R-454B, R-1234yf, R-290, R-744, R-717) with ASHRAE 34 safety class, GWP, ODP, critical properties, operating pressure ranges, applications, and engineering notes. Filter by family.

NEW — WHAT'S NEW SCREEN
Auto-presented on first launch with a guided tour of the v3.0 features.

NEW — HOME SCREEN
The home tab now prominently features the new Calculators and Refrigerants sections so they're visible the moment you open the app.

EVERYTHING ELSE
All v2.0 features carry forward: the four animated simulators in the Lab, the curriculum, the design projects, the searchable reference, and all 56 illustrations. Your saved progress migrates automatically.

Thanks for using HVAC Visual Learning Studio. Tap the feedback link in the Guide tab to send suggestions.

### 2.0 — 2026-05-05

Version 2.0 — Major Visual Refresh

This release nearly doubles the illustrated reference gallery and reorganizes it into a clearer narrative flow.

WHAT'S NEW

- 56 illustrated diagrams (up from 35) — every category expanded with photo-realistic and engineering-grade visuals
- 11 organized galleries (up from 7) — including new Whole-House Residential, Indoor Mechanical Room, Single-Family Block Diagrams, and AHU/VAV & Zoning categories
- Full-screen viewer with pinch-to-zoom, double-tap reset, and swipe-between-images
- Refined narrative ordering — fundamentals → whole-house → multi-unit → commercial → industrial → ventilation → controls → documentation
- "HVAC Simulation Lab" — refined title and navigation in the Lab tab

THE LAB STAYS LIVE

All four animated simulators are unchanged and ready to use:
- AHU Simulator — airflow particles, spinning fan, modulating dampers, virtual zone thermostat
- Refrigeration Cycle on a P-h diagram with live COP and EER
- Psychrometric Chart with live state plotting and process lines
- Chiller Plant with staging logic, cooling tower, and animated water flow

CURRICULUM, PROJECTS, REFERENCE

All curriculum modules, design projects, and reference content from v1.0 carry forward unchanged. Your progress, bookmarks, and last-viewed lesson all migrate automatically.

Thanks for using HVAC Visual Learning Studio. If you find this update useful, please leave a review — and tap the in-app feedback link to send us your suggestions. We read every one.

### 1.0 — 2026-05-04

No release notes.

## More apps by Yuhsiu Lai

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- [Engineer's Toolset](https://appshunter.io/ios/app/engineers-toolset/id478486737)
- [Battery Current Simulator](https://appshunter.io/ios/app/battery-current-simulator/id488430945)

All apps by Yuhsiu Lai: https://appshunter.io/developer/433114647

## Related topics

[hvac visual learning studio](https://appshunter.io/ios/topics/hvac-visual-learning-studio) · [hvac study](https://appshunter.io/ios/topics/hvac-study) · [Learning Studio](https://appshunter.io/ios/topics/learning-studio) · [hvac school and training resources](https://appshunter.io/ios/topics/hvac-school-and-training-resources)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-15.*