I'm a working HVAC tech, and I got tired of sketching ladder diagrams on the back of a work order or trying to draw one on a whiteboard app that wasn't built for it. So I made this.\n\nHVAC Ladder lets you draw a clean control diagram right at the unit \u2014 on a Surface, a shop laptop, or the desktop back at the office. Pick a symbol from the library, drop it on a rung, label it, done. When you're finished, export a PDF or PNG straight to your Documents folder and send it to the office, a helper, or the customer.\n\nWhat's in it:\n\u2022 The symbols you actually use \u2014 contacts, coils, switches, thermostats, pressure and float switches, HOA selectors, transformers, overloads, fuses, and more\n\u2022 Single-phase and three-phase \u2014 add or drop the L3 leg, set your supply voltage, add a disconnect with fuse sizes\n\u2022 Thermostat and HOA terminal blocks that wire out to their own rungs\n\u2022 Notes you can drop anywhere on the drawing\n\u2022 Dark mode for working in a dim equipment room (your exports still print clean on white)\n\u2022 Example electrical diagrams built in, so you can open one up and see how it's put together\n\nNo account, no subscription, no internet needed. It's just a tool that does the job.\n\nBuilt by a tech, for the trade. Happy wiring.