The ideal temperature to set your air conditioner at will vary depending on your personal preferences and the weather conditions outside. However, it is generally recommended to set your AC between 72-78°F (22-26°C) for optimal comfort and energy efficiency.

Air conditioners themselves do not cause health problems, but they can contribute to poor indoor air quality if they are not properly maintained or if the air filters are not cleaned regularly. This can lead to respiratory issues and allergies. It's important to keep your air conditioner clean and well-maintained to ensure that the air in your home is healthy and safe to breathe.

You can make your air conditioner more energy-efficient by keeping the air filter clean, sealing any air leaks in your home, using a programmable thermostat to adjust the temperature when you're not home, and keeping the AC unit shaded from direct sunlight. You can also consider upgrading to a newer, more energy-efficient model.

An air conditioner works by taking in warm air from a room, passing it over a cooling coil containing refrigerant, and then blowing the cool air back into the room. The heat that is removed from the air is transferred to the outside of the building through a separate set of coils.