{"id":20368,"date":"2025-11-06T17:00:49","date_gmt":"2025-11-06T16:00:49","guid":{"rendered":"https:\/\/ganaenergia.com\/blog\/?p=20368"},"modified":"2026-07-28T15:47:34","modified_gmt":"2026-07-28T13:47:34","slug":"transmitancia-termica","status":"publish","type":"post","link":"https:\/\/ganaenergia.com\/blog\/transmitancia-termica\/","title":{"rendered":"Transmitancia t\u00e9rmica: Qu\u00e9 es, c\u00f3mo se mide y c\u00f3mo reducirla para ahorrar energ\u00eda"},"content":{"rendered":"<p>La <strong>transmitancia t\u00e9rmica<\/strong> es uno de esos conceptos que todos hemos o\u00eddo cuando hablamos de aislamiento, pero pocos entienden realmente qu\u00e9 significa y c\u00f3mo afecta al <a href=\"https:\/\/ganaenergia.com\/blog\/cuantos-kwh-consume-casa-mes\/\">consumo energ\u00e9tico de una vivienda<\/a>. En mi experiencia como comercial energ\u00e9tico, he visto c\u00f3mo un simple error en el aislamiento puede duplicar la factura de la luz en invierno. Por eso quiero explicarte, con ejemplos claros, <strong>qu\u00e9 es la transmitancia t\u00e9rmica y c\u00f3mo puedes mejorarla<\/strong> para <a href=\"https:\/\/ganaenergia.com\/blog\/consejos-para-ahorrar-energia-en-casa\/\">ahorrar energ\u00eda<\/a> y dinero.<\/p>\n<h2>\u00bfQu\u00e9 es la transmitancia t\u00e9rmica?<\/h2>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-large wp-image-20384\" src=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/transmitancia-termica-1-1024x683.png\" alt=\"transmitancia t\u00e9rmica\" width=\"1024\" height=\"683\" srcset=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/transmitancia-termica-1-1024x683.png 1024w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/transmitancia-termica-1-300x200.png 300w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/transmitancia-termica-1-768x512.png 768w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/transmitancia-termica-1.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>La <strong>transmitancia t\u00e9rmica (U) mide la cantidad de calor que pasa a trav\u00e9s de un material o conjunto de materiales cuando hay diferencia de temperatura entre el interior y el exterior<\/strong>.<\/p>\n<p>En pocas palabras: <strong>cuanto menor sea la transmitancia t\u00e9rmica, mejor aislado estar\u00e1 el edificio<\/strong>.<\/p>\n<ul>\n<li><strong>Valor U bajo:<\/strong> Mejor aislamiento. Se escapa muy poco calor.<\/li>\n<li><strong>Valor U alto:<\/strong> Peor aislamiento. Se escapa mucho calor.<\/li>\n<\/ul>\n<h2>\u00bfC\u00f3mo se calcula la transmitancia t\u00e9rmica?<\/h2>\n<p>Aunque existe una <a href=\"https:\/\/riunet.upv.es\/server\/api\/core\/bitstreams\/fb1f5ec7-0652-41e4-81da-666523733943\/content\">f\u00f3rmula matem\u00e1tica y diversos c\u00e1lculos t\u00e9cnicos<\/a>, en la pr\u00e1ctica se usan valores de referencia seg\u00fan materiales y espesores. Para calcularla los t\u00e9cnicos realizan lo siguiente:<\/p>\n<ol>\n<li><strong>Suman todas las resistencias (Rt):<\/strong> la resistencia de cada capa del cerramiento.<\/li>\n<li><strong>Calculan la inversa:<\/strong> dividen 1 entre la resistencia total.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-20381\" src=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/Captura-de-pantalla-2025-11-06-a-las-16.36.08-1024x264.png\" alt=\"f\u00f3rmula transmitancia t\u00e9rmica\" width=\"1024\" height=\"264\" srcset=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/Captura-de-pantalla-2025-11-06-a-las-16.36.08-1024x264.png 1024w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/Captura-de-pantalla-2025-11-06-a-las-16.36.08-300x77.png 300w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/Captura-de-pantalla-2025-11-06-a-las-16.36.08-768x198.png 768w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/Captura-de-pantalla-2025-11-06-a-las-16.36.08.png 1266w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<ul>\n<li><strong>Si tienes mucho aislante (Rt alta) \u2192<\/strong> El Valor U (transmitancia t\u00e9rmica) es bajo por lo tanto el material a\u00edsla bien y ahorras en tu factura.<\/li>\n<li><strong>Si tienes poco aislante (Rt baja) \u2192<\/strong> El El Valor U (transmitancia t\u00e9rmica) es alto por lo tanto el material a\u00edsla mal (pierdes calor y gastas m\u00e1s).<\/li>\n<\/ul>\n<p>Reducir la transmitancia de una fachada de 1,0 a 0,3 puede suponer hasta un 40% de ahorro en calefacci\u00f3n.<\/p>\n<h2>Factores que influyen en la transmitancia t\u00e9rmica<\/h2>\n<ul>\n<li><strong>Tipo de material:<\/strong> el hormig\u00f3n transmite mucho calor; la lana mineral o el poliuretano, muy poco.<\/li>\n<li><strong>Espesor del aislamiento:<\/strong> a mayor grosor, menor transmitancia.<\/li>\n<li><strong>Puentes t\u00e9rmicos:<\/strong> interrupciones en el aislamiento.<\/li>\n<li><strong>Calidad de la instalaci\u00f3n:<\/strong> un mal sellado puede arruinar el aislamiento.<\/li>\n<\/ul>\n<h2>\u00bfC\u00f3mo reducir la transmitancia t\u00e9rmica en tu vivienda?<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-large wp-image-20395\" src=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362-1024x683.jpeg\" alt=\"transmitancia t\u00e9rmica\" width=\"1024\" height=\"683\" srcset=\"https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362-1024x683.jpeg 1024w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362-300x200.jpeg 300w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362-768x512.jpeg 768w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362-1536x1024.jpeg 1536w, https:\/\/ganaenergia.com\/blog\/wp-content\/uploads\/2025\/11\/30122362.jpeg 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p>Reducir la transmitancia mejora el confort y disminuye la demanda energ\u00e9tica.<\/p>\n<ul>\n<li>Aislar fachadas y cubiertas con materiales de baja transmitancia.<\/li>\n<li>Sustituir ventanas antiguas por <a href=\"https:\/\/climalit.es\/blog\/que-son-las-ventanas-con-rotura-de-puente-termico-rpt\/\">doble o triple acristalamiento con RPT<\/a>.<\/li>\n<li>Sellar grietas y juntas para evitar filtraciones.<\/li>\n<li>Revisar el aislamiento en suelos y falsos techos.<\/li>\n<\/ul>\n<p>El cambio de carpinter\u00eda puede reducir la transmitancia global un 25% y ahorrar unos 200 \u20ac anuales.<\/p>\n<h2>Transmitancia t\u00e9rmica y eficiencia energ\u00e9tica<\/h2>\n<p>La transmitancia es clave en el <a href=\"https:\/\/ganaenergia.com\/blog\/que-es-el-certificado-de-eficiencia-energetica\/\">Certificado Energ\u00e9tico de Viviendas<\/a>. Cuanto menor sea, mejor ser\u00e1 la letra (A o B).<\/p>\n<ul>\n<li>Mayor confort t\u00e9rmico.<\/li>\n<li>Menor consumo de energ\u00eda.<\/li>\n<li>Vivienda m\u00e1s sostenible y revalorizada.<\/li>\n<\/ul>\n<p>En <a href=\"https:\/\/ganaenergia.com\/tarifas-luz\">Gana Energ\u00eda<\/a> defendemos que la eficiencia empieza en casa.<\/p>\n<h2>Ejemplos de transmitancia t\u00e9rmica por materiales<\/h2>\n<table>\n<thead>\n<tr>\n<th>Elemento constructivo<\/th>\n<th>Material<\/th>\n<th>U (W\/m\u00b2\u00b7K)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Fachada antigua sin aislamiento<\/td>\n<td>Ladrillo macizo<\/td>\n<td>1,2<\/td>\n<\/tr>\n<tr>\n<td>Fachada rehabilitada<\/td>\n<td>Ladrillo + aislante EPS<\/td>\n<td>0,35<\/td>\n<\/tr>\n<tr>\n<td>Ventana antigua<\/td>\n<td>Vidrio simple<\/td>\n<td>5,0<\/td>\n<\/tr>\n<tr>\n<td>Ventana moderna<\/td>\n<td>Doble vidrio con RPT<\/td>\n<td>1,4<\/td>\n<\/tr>\n<tr>\n<td>Tejado sin aislamiento<\/td>\n<td>Teja + mortero<\/td>\n<td>1,5<\/td>\n<\/tr>\n<tr>\n<td>Tejado aislado<\/td>\n<td>Teja + XPS<\/td>\n<td>0,25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Preguntas frecuentes sobre la transmitancia t\u00e9rmica<\/h2>\n<div class=\"faq-elementor\"><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfQu\u00e9 diferencia hay entre transmitancia y conductividad t\u00e9rmica?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\" stroke=\"#353646\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">La conductividad t\u00e9rmica se refiere al material en s\u00ed, mientras que la transmitancia t\u00e9rmica considera el conjunto de capas.<\/div><\/details><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfQu\u00e9 valores son buenos para una vivienda eficiente?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\" stroke=\"#353646\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">Paredes con U &lt; 0,4 W\/m\u00b2\u00b7K y ventanas con U &lt; 1,5 W\/m\u00b2\u00b7K.<\/div><\/details><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfC\u00f3mo puedo saber la transmitancia de mi casa?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\" stroke=\"#353646\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">Puedes consultar el certificado energ\u00e9tico o pedir a un t\u00e9cnico un c\u00e1lculo.<\/div><\/details><details class=\"faq-item\"><summary class=\"faq-summary\"><span class=\"faq-question\">\u00bfReducir la transmitancia siempre implica obras grandes?<\/span><span class=\"faq-icon\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M12.1054 5.25L12.1055 12.25M12.1055 12.25L5.10547 12.25M12.1055 12.25L12.1055 19.2499M12.1055 12.25L19.1055 12.25\" stroke=\"#353646\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/span><\/summary><div class=\"faq-answer\">No siempre. Cambiar ventanas o a\u00f1adir aislamiento interior puede ayudar sin grandes reformas.<\/div><\/details><\/div><br\/>\n<h2>Conclusi\u00f3n<\/h2>\n<p>Si mejoras la <strong>transmitancia t\u00e9rmica de tu hogar<\/strong>, conseguir\u00e1s una casa m\u00e1s c\u00f3moda y eficiente. Adem\u00e1s, reducir\u00e1s el consumo en calefacci\u00f3n o climatizaci\u00f3n. Y si lo combinas con una de las <a href=\"https:\/\/ganaenergia.com\/tarifas-luz\">mejores tarifas de luz<\/a>, el ahorro ser\u00e1 a\u00fan mayor.<\/p>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;20368&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;1&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;5&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Punt\u00faa este Post&quot;,&quot;legend&quot;:&quot;5\\\/5 - (1 voto)&quot;,&quot;size&quot;:&quot;20&quot;,&quot;title&quot;:&quot;Transmitancia t\u00e9rmica: Qu\u00e9 es, c\u00f3mo se mide y c\u00f3mo reducirla para ahorrar 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<\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 122.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 20px; height: 20px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 16px;\">\n            5\/5 - (1 voto)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Quiero explicarte, con ejemplos claros, qu\u00e9 es la transmitancia t\u00e9rmica y c\u00f3mo puedes mejorarla para ahorrar energ\u00eda y dinero.<\/p>\n","protected":false},"author":26,"featured_media":20393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[699],"tags":[],"class_list":["post-20368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trucos-de-ahorro"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - 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