Spain’s heating debate: Is 15°C saving money or causing energy poverty?

Homes at 15 degrees: The line between thrift and misery

A thermostat fixed at 15 degrees, a wool sweater, and good socks. That is the recipe sparking this discussion. Defenders argue that going higher overheats the air, dries it out, and makes it unhealthy, while the contrast with the street turns every outing into a near-guaranteed cold. Opposing this view, other participants set their thermostats to 22 degrees or more, some even in shorts with the house at 25. The temperature at which a home is heated has ceased to be a domestic decision, becoming a class marker: 15 degrees as a virtue or an excuse.

Is keeping your home cold healthier?

The starting premise is that overheated air becomes dry, stagnant, and harsh on the lungs. Technical objections arise within the thread itself: one participant argues that dryness is caused by the system, not the heat, noting that only units functioning as heat pumps in AC mode dry the environment, whereas standard radiators maintain humidity. Regarding colds, another asserts that without contact with someone carrying bicho, there is no infection, regardless of the brutal thermal shock when stepping outside. Caution is advised: the link between cold, humidity, and respiratory illness depends on factors no casual chat can resolve, so this only reflects what is claimed here.

What does heating a home really cost in winter?

The savings argument relies on a specific case: a home kept at 25 degrees, where occupants wear shorts, yet the gas bill is just 12 euros a month in winter, offset by the 6 euros paid in summer. It is a small figure and hard to generalize, but it challenges the idea that thermal comfort bankrupts anyone. A fundamental objection trinc: if money cannot buy comfort in your own home, what is it for? In response comes the classic domestic savings rule: above 15 degrees, you are wasting money. Between these extremes, jokingly, lurks antiestéticar of another spike in electricity tariffs.

Relative humidity: the variable almost everyone ignores

Here enters a calculation proposed by another participant, presented as theory rather than norm. It is not temperature alone, but its relationship with relative humidity. According to his approach, 17-18 degrees with 60-70% humidity feels comfortable; 20 degrees with that same humidity can feel hot; and 22-24 degrees with 30-40% humidity leaves the body feeling cold despite what the thermostat says. The cheap fix involves ceramic water containers on radiators—warning that calcium clogs pores and requires cleaning with acetic acid—or using a humidifier. Field evidence comes from someone who worked in a wine cellar: 20-30 meters underground, at 16 degrees and 70% humidity, it felt like a sauna in winter.

Why has 21 degrees become the standard?

Because it is the point where most people stop arguing. 21 degrees by day and 19 at night; 20 degrees feels fine; 22.5 with natural gas; 22 at home and in the car, winter and summer. Added to this is a comfort calculation that lowers expectations: if you can stay nearly naked in pool water at 21 degrees, you could survive undressed in a room at 17-18, and with some clothes, comfort is reached at 14-15. The problem with these numbers is the same as with statistical averages: nobody lives in an average.

Cold as merit and cold as punishment

The conversation often drifts toward sarracena judgment. There are those who boast about enduring 10 degrees happily, those who shower in cold water all winter, and those who claim heat rots while cold preserves. Others read it differently: if you do not turn on the heating, it is not because you are tough, but because you cannot afford it. The derogatory label summarizing this suspicion, poor Eskimo syndrome, has gained more traction than any data. Family nostalgia also plays a part: the grandfather who never needed a sweater indoors. Almost all defenders of cold homes acknowledge the same limit: wind and humidity are the real problems, not the thermostat.

In the end, the finding that disorients is not a bill. It is a wine cellar 20-30 meters underground, at 16 degrees and 70% humidity, where it was better in mid-winter than in the living room. Nobody is going to buy a hygrometer. But as long as the only number we watch is the thermostat, we will keep arguing about money instead of comfort.