It depends on the country you're in. Here's a general guideline:
- In **North America** (including the US, Canada, and Mexico), home AC systems usually run on **220V** (or sometimes 240V).
- In many **other countries** (like those in Europe, Asia, Africa), the standard voltage is **220V** to **240V** for home appliances.
In some places, particularly in **North America**, certain appliances (like smaller ones) may run on **110V** or **120V**, but when it comes to air conditioners, they typically need the higher 220V/240V voltage to function properly.
So, in short: **Home air conditioners typically use 220V** in most countries, including the U.S., Canada, and Europe.