Supported Features
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
HVAC Ladder: Wiring Diagrams
Electrical control schematics
$9.99 · Designed for iPad. Not verified for macOS.
New in 1.4: tap any symbol to learn its full name and meaning, Hand-Off-Auto with an OFF indicator output, and a smoother iPad experience. Built by a tech, for techs.
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.
• 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!)
The developer, Kenny Robinson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Kenny Robinson
- Size
- 68.9 MB
- Category
- Productivity
- Compatibility
Requires iOS 14.0 or later and a device with the A12 Bionic chip or later.
- iPhone
Requires iOS 14.0 or later and a device with the A12 Bionic chip or later.
• iPhone XS
• iPhone XS Max
• iPhone XR
• iPhone 11
• iPhone 11 Pro
• iPhone 11 Pro Max
• iPhone SE (2nd generation)
• iPhone 12 mini
• iPhone 12
• iPhone 12 Pro
• iPhone 12 Pro Max
• iPhone 13 Pro
• iPhone 13 Pro Max
• iPhone 13 mini
• iPhone 13
• iPhone SE (3rd generation)
• iPhone 14
• iPhone 14 Plus
• iPhone 14 Pro
• iPhone 14 Pro Max
• iPhone 15
• iPhone 15 Plus
• iPhone 15 Pro
• iPhone 15 Pro Max
• iPhone 16
• iPhone 16 Plus
• iPhone 16 Pro
• iPhone 16 Pro Max
• iPhone 16e
• iPhone 17 Pro
• iPhone 17 Pro Max
• iPhone 17
• iPhone Air
• iPhone 17e - iPad
Requires iPadOS 14.0 or later and a device with the A12 Bionic chip or later.
• iPad Pro (11‑inch)
• iPad Pro (11‑inch) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (3rd generation)
• iPad Pro (12.9‑inch) (3rd generation) Wi‑Fi + Cellular
• iPad mini (5th generation)
• iPad mini (5th generation) Wi‑Fi + Cellular
• iPad Air (3rd generation)
• iPad Air (3rd generation) Wi‑Fi + Cellular
• iPad Pro (11‑inch) (2nd generation)
• iPad Pro (11‑inch) (2nd generation) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (4th generation)
• iPad Pro (12.9‑inch) (4th generation) Wi‑Fi + Cellular
• iPad Air (4th generation)
• iPad Air (4th generation) Wi‑Fi + Cellular
• iPad (8th generation)
• iPad (8th generation) Wi‑Fi + Cellular
• iPad Pro (11-inch) (3rd generation)
• iPad Pro (11-inch) (3rd generation) Wi‑Fi + Cellular
• iPad Pro (12.9-inch) (5th generation)
• iPad Pro (12.9-inch) (5th generation) Wi-Fi + Cellular
• iPad mini (6th generation)
• iPad mini (6th generation) Wi-Fi + Cellular
• iPad (9th generation)
• iPad (9th generation) Wi-Fi + Cellular
• iPad Air (5th generation)
• iPad Air (5th generation) Wi‑Fi + Cellular
• iPad (10th generation)
• iPad (10th generation) Wi‑Fi + Cellular
• iPad Pro (11‑inch) (4th generation)
• iPad Pro (11‑inch) (4th generation) Wi‑Fi + Cellular
• iPad Pro (12.9‑inch) (6th generation)
• iPad Pro (12.9‑inch) (6th generation) Wi‑Fi + Cellular
• iPad Air 11-inch (M2)
• iPad Air 11-inch (M2) Wi-Fi + Cellular
• iPad Air 13-inch (M2)
• iPad Air 13-inch (M2) Wi-Fi + Cellular
• iPad Pro 11-inch (M4)
• iPad Pro 11-inch (M4) Wi-Fi + Cellular
• iPad Pro 13-inch (M4)
• iPad Pro 13-inch (M4) Wi-Fi + Cellular
• iPad mini (A17 Pro)
• iPad mini (A17 Pro) Wi-Fi + Cellular
• iPad (A16)
• iPad (A16) Wi-Fi + Cellular
• iPad Air 11-inch (M3)
• iPad Air 11-inch (M3) Wi-Fi + Cellular
• iPad Air 13-inch (M3)
• iPad Air 13-inch (M3) Wi-Fi + Cellular
• iPad Pro 11-inch (M5)
• iPad Pro 11-inch (M5) Wi-Fi + Cellular
• iPad Pro 13-inch (M5)
• iPad Pro 13-inch (M5) Wi-Fi + Cellular
• iPad Air 11-inch (M4)
• iPad Air 11-inch (M4) Wi-Fi + Cellular
• iPad Air 13-inch (M4)
• iPad Air 13-inch (M4) Wi-Fi + Cellular - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later and a device with the A12 Bionic chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 HVAC Mobile
