Not hot enough, wired direct from 20 amp fuse.. will defrost windows slowly if you got 15 minutes ..gonna try another brand payday..Its not very good. Take 15 mins for a 4x 5 inch square to thaw enough to scrap. blows luke warm air. Still better than nothing but there must be a better option.Not enough heat. Did not help.Weak blowingBarely you can feel the heatDid doesn't give much heat make sure your lighter is the right voltage or it will blow it out like it did mineHad to come back because even though it works it will burn the fuse outThis is best item I brought for my car since my heat went out and can’t figure out what is wrong with it Man listen this little heater works very well, I am so glad that I brought it had it for 4 days now and it has not failed me. To get it working I had to turn on my defroster and we was in business. I would buy it againI just this car heater for the first time yesterday it doesn’t stay on. There’s a breakdown in the wire somewhere and the wire gets very hot when it does stay on. I bought this in September and I can’t return it cause it’s past the return time frame. Buy with caution. The air it pushes out you can feel it when your hand is almost touching it. Not very strong air flow either. Best of luck and stay warm.Got this to run off my 12v outlet in the back of my truck with camper shell. Themis barely put out any heat and feels like the cheapest plastic. The fan was weak too. Totally returned it.