HERE’S A HOT TIP: Faux fireplaces have somehow turned into a cool home accessory. Thanks to high-tech enhancements like artificial embers (they glow like the real thing), digital soundtracks (yes, you’ll hear a recording of a blaze) and even flame-free “holographic� fires, these fake hearths are finally getting some respect. Of the 1.3 million fireplaces sold last year, almost 60% were fueled by gas, and sales were up 15% in the first half of this year. And while electric fireplaces and heating stoves still only account for a ...