Watsky's basic premise is that it's cheaper to heat a single room with a space heater than to heat an entire house with a whole-home central heating system. On one hand, this is essentially a truism.

But does heating reduce humidity in your home? While central heating can make a room feel snug, it also plays a key role in changing the moisture levels in your home, just like the best dehumidifiers.

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Staying warm shouldn’t be a luxury. But for many UK households, heating is one of the biggest monthly expenses—especially for older properties that have never had a central heating system. The good ...