Stop Wiping Your Bathroom Mirror
We’ve all been there. You step out of a hot shower, reach for the mirror to shave or do your makeup, and you’re staring at a wall of white fog. You end up wiping a streak through the glass with a towel, which just leaves a smear. It’s annoying. The fix is usually an infrared (IR) heater or a quartz element tucked behind the glass. But flipping a switch every time you shower is a chore. The real magic happens when you let your house handle it for you. Making it automatic The goal here is to stop thinking about the heater entirely. By hooking the heater up to a smart relay or a Zigbee controller, you can make it react to your life. I usually set mine to trigger based on humidity. Once the sensor hits about 60%—basically the moment the steam starts filling the room—the heat kicks in. No more waiting around for the glass to clear. It’s just… clear. The science (the simple version) We use short-wave infrared because it doesn’t waste time heating up the air in the room. It goes straight for the glass. That’s why it feels almost instant. But you have to be careful with the power. If you crank it too high, you risk cracking the mirror. Too low, and the fog wins. It’s all about finding that sweet spot where the glass stays just warm enough to keep the dew away. A few things to watch out for Putting a high-wattage heater on a digital switch adds some complexity. You can’t just use any cheap relay; you need one that can handle the load, or you’ll end up with “welded” contacts that won’t turn off. And a pro tip: hide your controller. Don’t shove it inside the vanity cabinet. Even with the door closed, moisture creeps in and ruins the circuit board. Keep it in a dry zone, and you’re golden.