When extracting the water is the main goal, it's called a dehumidifier. If the goal is to make hot air cold, it's called an AC and the water is considered an u

When extracting the water is the main goal, it's called a dehumidifier. If the goal is to make hot air cold, it's called an AC and the water is considered an unwanted byproduct. If the goal is to extract money from people, it's called "making drinking water from thin air" or "self filling water bottle", usually seen on crowd funding platforms. No actual product or byproduct is made.