But a portable air ... tank of water — perfect for those who want to use it while they sleep at night. The efficient device can lower the temperature to just 65 degrees Fahrenheit in a room ...

Consumer Reports tested heat pump water heaters to determine which ones were the most energy-efficient and fastest at heating ...

According to him, air coolers are generally considered a healthier option, as they introduce fresh air into the room, whereas air conditioners ... of cooling pads, water tanks, and fans is essential.