# HVAC Ladder: Wiring Diagrams — Electrical control schematics

> Electrical control schematics (iPhone/iPad app by Kenny Robinson.)

- Source: https://appshunter.io/ios/app/hvac-ladder-wiring-diagrams/id6787488926 (this page in markdown: same URL + `.md`)
- Developer: [Kenny Robinson](https://appshunter.io/developer/6787488928)
- Category: Productivity, Education
- Price: $9.99
- Age rating: 4+
- Requires: iOS 14.0 · 66 MB
- Languages: American English
- Released: 2026-07-09
- Data updated: 2026-08-22
- User reviews in markdown: https://appshunter.io/ios/app/hvac-ladder-wiring-diagrams/id6787488926/reviews.md

## What is HVAC Ladder?

HVAC Ladder lets you draw clean wiring and electrical control ladder diagrams right on your phone or iPad — standing at the unit, in the truck, in class, wherever you are. Tap a symbol from the library, drop it on a rung, label it, done. Export a PDF or PNG and send it to the apprentice, another tech, the teacher, or the shop.

DRAW IN SECONDS
• Hold and drag symbols straight onto numbered rungs
• Real ladder layout: L1/L2 rails, an L3 leg for three-phase loads, parallel branches
• Undo, autosave, and crash recovery protect every change
• The diagram scales to fit your screen — iPhone or iPad, portrait or landscape

THE SYMBOLS YOU ACTUALLY USE
• Contacts, push buttons, relays, and coils
• Pressure switches, thermostats, flow, float, and limit switches
• Motors, compressors, transformers, capacitors, start relays, heat elements
• Multi-terminal thermostat block (R, G, Y, W, C and more) and a Hand-Off-Auto selector with an optional OFF indicator output

LEARN IT. TEACH IT.
• Tap any symbol to see its full name and plain-English meaning — no abbreviation left unexplained
• Guided tour wires up a real fan control with a step-down transformer, step by step
• Built-in symbol glossary and a full illustrated manual — study offline anywhere
• Example circuits to explore and modify: heat pump with defrost, walk-in cooler, air compressor, start-stop
• Instructors: build a circuit live in class and export it as a handout

EXPORT & SHARE
• Clean black-and-white PNG and vector PDF with a title block: project, equipment, name, date
• Prints like a real schematic — black on paper
• Share the editable diagram file; it opens in HVAC Ladder on iPhone, iPad, Android, and Windows

PRIVATE BY DESIGN
• 100% offline — no account, no sign-in, no ads
• We collect nothing; your diagrams stay on your device

Made by a working HVAC tech for the techs in the trade — and for the apprentices, students, and instructors learning it. Real feedback from the field shapes every update.

## Chart rankings

- #196 in Top Paid · Productivity (US App Store)


## Version history (last 5 releases)

### 1.4 — 2026-08-01

• Tap any symbol in the library to see its full name and plain-English meaning — great for apprentices(THANKS STEPHEN!)
• Hand-Off-Auto block: optional OFF output for a "system off" indicator light
• Glossary now spells out every abbreviation
• Smoother rotation and startup on iPad — no more layout jump
• Diagrams scale beautifully to any screen, portrait or landscape
• Sticky notes land exactly where you placed them in PDF and PNG exports
• Dozens of fixes from tester feedback — keep it coming!(THANKS ALEX!)

### 1.3 — 2026-07-31

• Diagram now scales to fit your screen — much better on tablets and landscape
• Redesigned symbol library: one continuous scrolling strip, faster to browse
• Delete multiple saved diagrams at once
• Notes land exactly where you placed them in PDF and PNG exports
• Guided tour now works great on every screen size
• Sharper canvas, smoother startup, and lots of small fixes

### 1.2 — 2026-07-19

• All-new guided tour
• Symbol Glossary
• New PTC symbol
• Launch animations
• Dark mode & accessibility polish

### 1.1 — 2026-07-16

-Animated tutorial of the basics.
-Fixed L3 button glitches when loading a file.
-Included a PDF manual.

### 1.0 — 2026-07-09

No release notes.

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## Related topics

[schematic electric](https://appshunter.io/ios/topics/schematic-electric) · [electrical wiring diagram](https://appshunter.io/ios/topics/electrical-wiring-diagram)

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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 2026-08-22.*