Candle not running out while using candle warmer

So I recently just got a candle warmer, love it so far! However I have many many candles and I am trying to use them up to make space in my house..I recently noticed that when using the warmer the wax doesn’t evaporate therefore my candles are not running out😭😭 does anyone have any tips?! Is there a science to using a candle warmer??