If you burn a lot of candles, you probably find yourself buying new ones pretty often, not to mention cleaning melted wax out of the holder. Here’s a trick that’ll make them last nearly twice as long.
Freeze them! Candles will last longer (almost 2 times), if they are placed in the freezer for a day before using them. Chilling the wax gives it a bit longer before burning through and leaving you with an empty jar. For some candles this will also cause them to drip less and burn straight down without burning through the side of the candle.
In addition, you can even throw them in the freezer after you’ve used them to make cleaning up that residual wax easier!
Source – Apartment Therapy Chicago