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[–] celerycar ago  (edited ago)

Most recent studies (not sure from where LOL) suggest that external wall fireplaces actually "cool" a house rather than heat it.

The cold air entering the house to stoke the fire (and exit out the chimney) produces a cooling effect on the house. Interior fireplaces are the way to go - plus the brick in the fireplace and chimney is a good thermal mass for extending the heating by a few minutes to hours.

As for a candle in a car, I would be very leery of that due to CO poisoning. I don't know how much air exchange happens in an enclosed car, so candles may not be the best option for breathing. I don't doubt they have good potential for warming.

Edit: didn't tie the thoughts together LOL.

To keep from dying of Carbon monoxide poisoning in a car, you would probably have to crack a window for ventilation - thereby negating all of the warmth generated by the candle in the first place.

Keep open fires out of enclosed areas!