The knob on the old style duvets is a thermostat you can hear clicking all night. Old controllers switch on / off at maximum heat - in addition, they measure the temperature in the room. I understand that many people want to feel that sudden warmth, but in my case I wanted a duvet that would stay warm all night. This low voltage blanket works differently. The controller does not cycle on/off; These controls provide continuous power to the wires, so the amount of heat generated by the blanket is always fixed (user selectable). Once you turn on the controller, the items in the ceiling will remain powered throughout the night for a maximum of 10 hours before the controller automatically turns them off. The controller ranks the amount of heat you choose from low to high (the blanket will be hot). The duvet will maintain the chosen constant temperature throughout the night without any sudden outbursts. This is constant gentle heat with no on/off switching. Once you get used to how it works, you'll probably end up using the lowest settings. The blanket works on low voltage (18 volts), the cables are thinner and the blanket is lighter. I feel safer than a wrap. in an old style ceiling where the voltage running through the wires is 120 VAC. I bought a Serta duvet very similar to this one last year. Serta has increased the prices astronomically since then, so I decided to buy these and try them out. Compared to the Serta I have; This blanket has the same controller, it works and feels the same. It wasn't packaged in a fancy box but was sealed and sealed in a clear plastic bag with instructions. cold and wrap yourself in a hot blanket, you will be disappointed. Since it doesn't, these low voltage blankets are designed to work. Will this blanket come in handy for setting your house thermostat to 45 F and wrapping yourself in a hot blanket? No, he won't do it effectively. It works very well at room temperature above 20 degrees Fahrenheit. However, it all depends on your cold tolerance and how used you are to the cold. Florida residents have a different idea of what cold is. cold weather and how cold it is in the room by those who live in Alaska. I hope you enjoyed the review.
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