{"id":4987,"date":"2026-09-29T09:00:10","date_gmt":"2026-09-29T09:00:10","guid":{"rendered":"http:\/\/mjarc.com\/2022\/12\/19\/torne-a-sua-casa-eficiente-e-reduza-o-consumo-energetico\/"},"modified":"2026-09-29T09:10:27","modified_gmt":"2026-09-29T09:10:27","slug":"energy-efficient-home-winter","status":"publish","type":"post","link":"https:\/\/mjarc.com\/en\/energy-efficient-home-winter\/","title":{"rendered":"Preparing Your Home for Winter: Comfort Begins with the Building"},"content":{"rendered":"<p>An energy-efficient home is more than a home with good equipment or solar panels. It is a home that <strong>needs less energy to provide comfort<\/strong>: it welcomes sunlight and warmth when they are useful, retains heat indoors, allows fresh air to circulate and avoids overheating in summer. Its performance depends on the relationship between the building fabric, orientation, ventilation and technical systems.<\/p>\n<p>The roof, walls and windows form the envelope that separates the interior from the outdoor climate. When they are properly insulated and built, they help reduce heat loss in winter. Solar shading makes it possible to adjust how much sunlight enters throughout the year, while ventilation renews indoor air without relying on uncontrolled draughts. Only then does it make sense to consider how heating, hot-water systems and renewable energy can meet the remaining needs.<\/p>\n<p>In a new home, these relationships can be considered from the moment the building is positioned and oriented. In an existing home, the starting point is to observe where it feels cold, where condensation appears and how the spaces respond throughout the day. Not every improvement requires extensive building work \u2014 and early autumn is a good time to begin.<\/p>\n<h2>Let the winter sun in<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-19737\" src=\"https:\/\/mjarc.com\/wp-content\/uploads\/2022\/12\/bedroom-douro-wood-house-1-1000x562.webp\" alt=\"douro wood house bedroom at winter, architecture by mjarc architects\" width=\"1000\" height=\"562\" srcset=\"https:\/\/mjarc.com\/wp-content\/uploads\/2022\/12\/bedroom-douro-wood-house-1-1000x562.webp 1000w, https:\/\/mjarc.com\/wp-content\/uploads\/2022\/12\/bedroom-douro-wood-house-1-768x432.webp 768w, https:\/\/mjarc.com\/wp-content\/uploads\/2022\/12\/bedroom-douro-wood-house-1-1536x863.webp 1536w, https:\/\/mjarc.com\/wp-content\/uploads\/2022\/12\/bedroom-douro-wood-house-1-2048x1151.webp 2048w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/mjarc.com\/en\/architecture-projects\/wood-house\/\"><span style=\"font-size: 10pt;\">Douro Wood House<\/span><\/a><\/p>\n<p>In rooms that receive sunlight, opening shutters and curtains during the day allows the sun to provide natural warmth. Once daylight fades, closing them can help reduce the feeling of cold near the windows.<\/p>\n<p>This strategy depends on each home\u2019s orientation and surroundings. A window that welcomes the winter sun may also cause excessive heat in summer, so shading should allow sunlight to be adjusted throughout the year. This attention to climate is central to <a href=\"https:\/\/mjarc.com\/en\/bioclimatic-architecture-portugal\/\">bioclimatic architecture<\/a>.<\/p>\n<h2>Find and address draughts<\/h2>\n<p>Before replacing windows, check whether they close properly, whether the seals are in good condition and whether air is entering around doors. Repairing fittings or replacing seals can improve comfort when the problem is localised.<\/p>\n<p>If the frames are deteriorated or provide little insulation, a more substantial solution may be needed. Energy-efficient windows can improve thermal and acoustic comfort, but their selection should be considered alongside ventilation and the rest of the home. ADENE\u2019s <a href=\"https:\/\/www.adene.pt\/multimedia\/minuto-energia-11\/\">CLASSE+ window label<\/a> can help compare options.<\/p>\n<h2>Ventilate without leaving the house open all day<\/h2>\n<p>An energy-efficient home still needs fresh air. Cooking, showering and everyday activities produce water vapour; when it meets cold surfaces, condensation can form. Opening windows regularly for a few minutes, ideally to create cross-ventilation, and airing rooms after moisture-producing activities are useful winter habits.<\/p>\n<p>In more extensive renovations, ventilation should be considered as part of the home\u2019s overall performance. Depending on the building and its needs, it may be natural or provided by a mechanical system. The aim is to renew indoor air adequately while avoiding both insufficient ventilation and uncontrolled air leaks.<\/p>\n<p>If mould or damp patches keep returning, their cause should be identified before repainting or covering the wall. Ventilation can help manage condensation, but it cannot repair a leak or correct a construction defect.<\/p>\n<h2>Look at the roof and walls<\/h2>\n<p>When a home cools down quickly despite these measures, the problem may lie in its envelope. Improving roof or wall insulation helps retain indoor warmth and reduce the need for heating. The priority, however, depends on the type of construction and the condition of each element.<\/p>\n<p>External wall insulation can provide a continuous insulating layer and help address areas where heat escapes more easily, such as junctions between building elements. But it is not suitable for every home: the fa\u00e7ade, existing materials and architectural character may call for another approach. In renovation, better thermal performance should be compatible with what deserves to remain.<\/p>\n<h2>Choose systems and energy sources carefully<\/h2>\n<p>Once the home\u2019s energy needs have been reduced, it becomes easier to size the heating system and assess renewable-energy options. <strong>Solar thermal systems<\/strong> use sunlight to produce heat, usually for hot water. <strong>Photovoltaic panels<\/strong> generate electricity that can be used in the home. These technologies serve different purposes, and their suitability depends on factors such as solar exposure, available space and patterns of energy use.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-16424\" src=\"https:\/\/mjarc.com\/wp-content\/uploads\/2023\/07\/Perspectiva-2-1000x625.webp\" alt=\"Vista a\u00e9rea de uma estrutura moderna com telhados verdes e pain\u00e9is solares, integrada na paisagem montanhosa. A arquitetura \u00e9 minimalista, com grandes planos brancos e a relva no topo a mimetizar o ambiente circundante.\" width=\"1000\" height=\"625\" srcset=\"https:\/\/mjarc.com\/wp-content\/uploads\/2023\/07\/Perspectiva-2-1000x625.webp 1000w, https:\/\/mjarc.com\/wp-content\/uploads\/2023\/07\/Perspectiva-2-768x480.webp 768w, https:\/\/mjarc.com\/wp-content\/uploads\/2023\/07\/Perspectiva-2-1536x960.webp 1536w, https:\/\/mjarc.com\/wp-content\/uploads\/2023\/07\/Perspectiva-2.webp 1600w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/mjarc.com\/en\/architecture-projects\/projeto-de-arquitetura-hotel-vinico-douro\/\"><span style=\"font-size: 10pt;\">Vineyard Douro Hotel<\/span><\/a><\/p>\n<p>For the coming winter, it is also worth making better use of what is already in place: check the condition of heating equipment, adjust temperatures to how each room is used and avoid obstructing radiators with furniture or curtains. A more powerful system will not correct a home that continually loses heat.<\/p>\n<h2>Start with the home you have<\/h2>\n<p>There is no single order of improvements that suits every home. In one, worn window seals may be the most obvious problem; in another, the priority may be the roof, ventilation or a persistently damp wall. An <a href=\"https:\/\/mjarc.com\/en\/energy-certificates-adene-experts\/\">energy performance certificate<\/a> can help identify potential improvements, which should then be assessed in light of the building and the needs of those who live there.<\/p>\n<p>Preparing a home for winter is also a way of understanding it more deeply. Observing the path of the sun, the temperature of each room and the movement of air helps inform better decisions \u2014 from small repairs today to a renovation that provides comfort for many winters to come.<\/p>\n<h2>Frequently asked questions<\/h2>\n<h3>Does an energy-efficient home need solar panels?<\/h3>\n<p>No. Efficiency begins by reducing energy needs through the building envelope, orientation, shading and ventilation. Solar systems can complement that approach.<\/p>\n<h3>Should I replace the windows before insulating the roof?<\/h3>\n<p>It depends on the home. The condition of each element and the source of discomfort should determine the priority; replacing one component alone may not solve the main problem.<\/p>\n<h3>If I improve insulation, do I still need ventilation?<\/h3>\n<p>Yes. Insulation and ventilation have different roles: one helps retain heat, while the other renews indoor air and helps control moisture.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 12pt; color: #000000;\"><strong>Sources: <\/strong><a style=\"color: #000000;\" href=\"https:\/\/www.adene.pt\/area-tematica\/eficiencia-energetica\/?utm_source=chatgpt.com\">ADENE \u2014 Efici\u00eancia energ\u00e9tica<\/a>,, <a style=\"color: #000000;\" href=\"https:\/\/saveenergytogether.adene.pt\/wp-content\/uploads\/2025\/09\/Aquecimento.pdf?utm_source=chatgpt.com\">ADENE \u2014 Aquecimento e ventila\u00e7\u00e3o no inverno<\/a>, <a style=\"color: #000000;\" href=\"https:\/\/portalcasamais.pt\/?utm_source=chatgpt.com\">Portal casA+ <\/a>\u00a0and <a style=\"color: #000000;\" href=\"https:\/\/energy.ec.europa.eu\/topics\/energy-efficiency\/energy-performance-buildings\/energy-performance-buildings-directive_en?utm_source=chatgpt.com\">Comiss\u00e3o Europeia \u2014 Desempenho energ\u00e9tico dos edif\u00edcios<\/a>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>An energy-efficient home is more than a home with good equipment or solar panels. It is a home that needs less energy to provide comfort: it welcomes sunlight and warmth when they are useful, retains heat indoors, allows fresh air to circulate and avoids overheating in summer. Its performance depends on the relationship between the [&hellip;]<\/p>\n<p class=\"read-more\"><a class=\"button\" href=\"https:\/\/mjarc.com\/en\/energy-efficient-home-winter\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":19738,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[35],"tags":[446,447,448],"class_list":["post-4987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eficiencia-en","tag-efficient-house","tag-energy-consumption","tag-savings"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Energy-Efficient Homes: How to Prepare Your Home for Winter<\/title>\n<meta name=\"description\" content=\"Discover what makes a home energy efficient and how passive strategies, simple repairs and planned 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