The so-called personal air purifiers promise to protect users of viruses and harmful bacteria, but experts say that the devices do not work in real conditions, says Laura Johannes in the Wall Street Journal. Personal air purifiers such as Wein Products' Minimate AirSupply are supposed to be worn around the neck.

When the conditions are good, cooling your house with an entire house fan consumes less energy than most air conditioning systems. Its efficiency and. In most homes, it's better that you don't have an entire house fan at all and just run the air conditioning instead.

A high quality humidity meter used in the correct material can be accurate to less than 0.1 of the moisture content of the materials by weight. However, a low level humidity meter can be very imprecise.

Wi-Fi extenders work differently than Wi-Fi repeaters. Wi-Fi Powerline extenders can even use the electrical cables of the walls to retransmit your wireless signal. Cable connection means that a Wi-Fi extender always has a strong and dedicated connection to your network that is not susceptible to interference.

According to a report from the Wall Street Journal, hotel thermostats are often not under customer control, even if hotels like you think differently.