Looking for cold spots is pretty technical but here's exactly how to nail it - grab a thermometer right away and make sure that breaker is on first thing especially in harder difficulties. You want rooms warming up naturally so the ghost room stands out. When scanning rooms, point the thermometer down and give it a good 2-5 seconds to get accurate readings, anything below 10°c is suspicious but below 9°c in clear weather or 6°c in bad weather is definitely worth investigating.

The really key timing window is those first 2-3 minutes after hitting the breaker, that's when temperature differences are most obvious between normal and haunted rooms. You might notice your breath getting visible around 5°c or lower but don't trust that alone since weather can mess with it. What you're specifically watching for is consistent cold spots in one room versus brief cold spikes in hallways which usually just means the ghost is wandering.

Good to know - pair this method with emf level 5 readings or listen for interaction sounds like doors or thrown objects for confirmation. In bigger areas, sound sensors or parabolic mics can help narrow things down faster but temperature is still your most reliable tell especially if you keep that breaker running and factor in any weather effects that might throw off your baseline readings.