What we should have here are very impractical anticipation by reviewers. They are ignorant as to what they are buying. Here is what to anticipate - look at the power level. This unit and similar (cigarrete lighter ones) are about one hundred and eighty watts. I use one of these in my car initially when i first switch it on to warm-up my hands or encounter. This unit is ONLY one hundred and eighty watts...it won't heat up something other than a few in . in front of it. I use it when I get in my car on frozen Mn winter days to consider the "sting" off the long walk to the frozen car. Once the car warms up I shut them back. People here reviewing are faily unaware so here's what you are very likely..take a hair dryer...1200 watts. You should expect about 1/seven from the heat from a hair dryer. Watts is watts people!!! There isn't any magic transformation- look at the power level of something you know - a family group plug-in heater is generally 1200 watts - because its drawing 10amps at 120volts Air conditioning. Your car is only 12-14v electricity. So even at say 15amps, enought to blow a 15amp blend, a 15amp signal much like your cigarette lighter can only supply 180watts at 12 volts. If you need more heat look at the 300W design which is a direct cable out of your car battery - but don't anticipate miracles. These heating units is only going to increase and not replace your car's heater. Eventually I had been setting up a stereo system or something like that in my car on the winter day having a home heater (1200 watts) operating inside the car - and that nevertheless didnt supply sufficient heat to warm-up the car. If its 70 degrees within your car when utilizing these heating units they are able to get very hot. If its Absolutely no degrees they'll supply a little bit of heated air-just enough to warm your face or hands. Thats it. 180Watts. Like two 90watt light bulbs within your house. Bulbs get truly Warm when its 70 degrees within your house, but go ahead and take gentle outdoors to Absolutely no or 32 degrees and you'll begin to see the gentle does not get that hot. Thats what we have. From an architectural standpoint it may raise the background atmosphere By quantity of degrees regardless of the temperature. So if it's sixty degrees in the car, maybe it has a 70 degree rise and tosses out one hundred thirty degree atmosphere. But when its zero, it continues to have a 70 degree rise so it spits out 70 degree atmosphere.