The signal of an infrared remote control typically reaches a range of about 30 feet (9 meters) in a direct line of sight. However, this range can vary depending on the strength of the remote control and any obstructions between the remote and the device being controlled. Infrared signals do not pass through walls or other solid objects, so the range may be limited in certain situations. **

The most powerful portable air conditioner currently available is the Whynter ARC-14S. It has a cooling capacity of 14,000 BTU, making it suitable for large rooms or spaces up to 500 square feet. The unit also features a dual hose system for more efficient cooling and comes with a programmable timer and remote control for convenience. Overall, the Whynter ARC-14S is a top choice for those looking for a powerful portable air conditioner. **

Infrared heaters are not less efficient with sound-absorbing walls. The efficiency of an infrared heater is not affected by the type of walls in the room. Infrared heaters work by emitting infrared radiation that heats objects and people in the room directly, rather than heating the air. Therefore, the presence of sound-absorbing walls should not impact the efficiency of an infrared heater. **

To make your portable air conditioner more efficient, you can start by ensuring that the unit is properly sized for the room you are trying to cool. Additionally, make sure that all windows and doors are closed to prevent cool air from escaping and warm air from entering. Regularly clean or replace the air filter to maintain optimal airflow. You can also use curtains or blinds to block out sunlight and reduce the heat load on the unit. Finally, consider using a fan to help circulate the cool air more effectively throughout the room. **

Infrared heaters are designed to heat a room or space by emitting infrared radiation that warms objects and people directly, similar to the sun's rays. They are typically used for whole-room heating and are more energy-efficient than traditional heaters. Infrared heat lamps, on the other hand, are focused on providing localized heat to specific areas or objects, such as in outdoor spaces, bathrooms, or for therapeutic purposes. They emit infrared radiation in a more concentrated manner and are often used for spot heating rather than whole-room heating. **

The cheapest infrared heater/electric heater can vary depending on the brand, model, and features. However, some of the most affordable options include compact infrared space heaters or basic electric fan heaters. These types of heaters are often designed for small spaces and can be found at budget-friendly prices. It's important to consider the heating capacity, energy efficiency, and safety features when choosing a budget-friendly infrared or electric heater. **

Infrared heaters are generally considered more efficient than night storage heaters. This is because infrared heaters heat objects directly, rather than heating the air like night storage heaters, which can lead to heat loss. Infrared heaters also provide instant heat, whereas night storage heaters require time to charge up and release heat. Overall, infrared heaters are a more energy-efficient and cost-effective option for heating spaces. **

Infrared radiation is generally not harmful to humans in small doses. It is a form of electromagnetic radiation that is commonly used in various applications such as heating, cooking, and communication. However, prolonged exposure to high levels of infrared radiation can potentially cause skin burns or eye damage. It is important to use protective measures, such as wearing appropriate clothing or using shielding, when working with sources of intense infrared radiation. **