Heating: From €45 to €225 a month to stay warm at home

Heating your home in Spain costs between €45 and €225 per month

Nobody goes bankrupt from heating in Spain. Or do they? It depends on the house you were born in. Between the lowest bill someone declares and the highest, there's a fivefold difference, and the disparity rarely has to do with the thermostat setting.

How much do you pay for heating per month in Spain?

Those living in a well-oriented apartment and who only heat minimally declare between €30 and €45 per month during the coldest months, using a heat pump or a supplementary radiator. At the other extreme, a large home kept at 21°C all day can reach €225 per month in winter, compared to the €150 it costs for the same house in summer. The seasonal gap is what's confusing: it's not that heating is extremely expensive, but rather that the cost is concentrated in three months.

With heating oil, the picture doesn't improve either. A family with two young children, keeping the house at 21°C, declares €800 annually, with a recurring argument: dropping below that means a constant stream of colds. Another large house went from €1,200 per year heating all rooms to €500 by limiting usage to three radiators and moving their bed to the living room.

Why is it colder inside than outside?

Paper-thin walls. Single-pane windows. Steel window frames from the 70s. A man who moved to Valencia said he had never felt colder in his life; the day he visited his family home in Zaragoza in February, he understood everything. The problem there wasn't the climate, it was the building.

The most common diagnosis points to the same issue: "We have a fabulous climate, we are the Florida of Europe, and yet inside our homes, it's colder than outside." Apartments in Asturias have been recorded at 14°C with outside temperatures of -5°C, and homes in Barcelona where it's 15°C outside at midday, and a blanket is still needed inside. Poorly ventilated portable heaters, by the way, continue to cause problems: a family in Barcelona fainted and miraculously proge up thanks to a phone call.

The energy rating that doesn't appear in any advertisement

The criticism of poor building standards comes with a price tag. It is argued that energy efficiency information is "false, incomplete, or missing": new construction advertisements rarely publish the kWh/m² per year figure, which is legally required, and settle for a letter that means nothing to the buyer. If Spain built to Northern European insulation standards, they add, heating would be unnecessary in almost all cases.

Butane, firewood, and the art of heating a single room

This is where domestic ingenuity comes in. A butane cylinder every three weeks at €18 in a mountain village where it freezes from November to March. €24 for electricity and two or three cylinders throughout the winter in another case. And some declare zero euros because they live in Murcia or the Canary Islands and don't turn on any heating. Closing doors and living in two rooms is the most common strategy.

There are also those who have spent two winters at 13°C, with days at 11°C, not due to lack of money, but to avoid paying what they consider a rip-off. In summer, the same reasoning is applied to air conditioning and being indoors at 34°C. Radical consistency or stubbornness, depending on who you ask.

Changing the boiler: from €200 to €125 per month

Renovations work. One home went from €200 to €125 per month in December, January, and February just by changing the boiler. Another case points to an investment of €5,500 in equipment and insulation that reduced annual consumption by 65%, keeping the house warm 24 hours a day with an estimated payback period of five years. The complete calculation, broken down line by line on a tracking sheet, shows a surprising difference.

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Flow temperature, heating curves, and weekly time-slot programming are the settings most frequently mentioned by those who have managed to lower their bills without feeling cold. The rest continue to argue whether the problem is the price or the thermostat.

As long as electricity continues to set records in daily auctions, the most likely response will not be to renovate the housing stock—expensive, slow, and disruptive—but to continue lowering the thermostat and adding layers of clothing. With the climate in our favor and poor buildings against us, the margin to reduce heating bills without touching the building envelope is running out every January.