{"id":13233,"date":"2026-10-22T13:11:32","date_gmt":"2026-10-22T11:11:32","guid":{"rendered":"https:\/\/templari.com\/how-many-kw-to-heat-an-industrial-building\/"},"modified":"2026-10-26T12:39:55","modified_gmt":"2026-10-26T11:39:55","slug":"how-many-kw-to-heat-an-industrial-building","status":"publish","type":"post","link":"https:\/\/templari.com\/en\/news\/how-many-kw-to-heat-an-industrial-building\/","title":{"rendered":"Warehouse heating: how many kW to heat an industrial building and how it is calculated"},"content":{"rendered":"<div id=\"aa\">\n<style>body:has(#aa){overflow:visible!important;overflow-x:clip!important}body:has(#aa) .featured-media-under-header{display:none!important}body:has(#aa) .container-wrap{padding:0!important;background:#000!important}body:has(#aa) .container-wrap .main-content,body:has(#aa) .main-content>.row,body:has(#aa) .post-area,body:has(#aa) article.post,body:has(#aa) article .inner-wrap,body:has(#aa) .post-content,body:has(#aa) 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52px}#aa .fine p{font-size:16px}@media(max-width:820px){#aa{font-size:18px}#aa p,#aa li{font-size:18px}#aa .hero{min-height:auto}#aa .hero .in{padding:96px 20px 32px}#aa .lead{font-size:18px}#aa .sec{padding:40px 0}#aa .wrap{padding:0 20px}#aa .subnav{top:64px}#aa .faq .wrap{grid-template-columns:1fr;gap:8px}}<\/style>\n<section class=\"hero\" style=\"background-image:url(https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/p10-kita-air-capannone-produzione-2-5.jpg)\">\n<div class=\"in\"><span class=\"badge\">Technical tips<\/span><\/p>\n<h1>Warehouse heating: how many kW to heat an industrial building and how it is calculated<\/h1>\n<p class=\"lead\">How many kW does a 400 square metre industrial building need? It is the question we hear most often, on Google and on the phone. The short answer is that one Kita Air is usually enough. The real answer depends on the building, and here we explain on what.<\/p>\n<\/div>\n<\/section>\n<div class=\"subnav\">\n<nav><a href=\"#s1\">Start from the volume, not the floor area<\/a><a href=\"#s2\">From 10 to 60 watts per cubic metre: it depends on how it is built<\/a><a href=\"#s3\">The real number comes from the heat load calculation<\/a><a href=\"#s4\">The rule of thumb<\/a><a href=\"#s5\">Where the heat goes matters too<\/a><a href=\"#s6\">Neither too big nor too small<\/a><a href=\"#s7\">Frequently asked questions<\/a><\/nav>\n<\/div>\n<section id=\"s1\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">01<\/p>\n<h2>Start from the volume, not the floor area<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Heat is calculated on the gross volume: external dimensions times height. A 400 m\u00b2 building 7 metres high holds 2,800 m\u00b3 of air, more than twice a house with the same floor plan. For a first estimate, the volume is multiplied by the watts each cubic metre loses on the coldest day of the area.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s2\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">02<\/p>\n<h2>From 10 to 60 watts per cubic metre: it depends on how it is built<\/h2>\n<p>It ranges from about 10 W\/m\u00b3 for a recent, insulated building to 40-60 W\/m\u00b3 and more for a prefabricated one with uninsulated roof and walls and doors that let air through. A poorly insulated building with leaky doors sits in between: 25 to 40. Two buildings with the same floor plan can need very different power.<\/p>\n<p>That is why on a site visit we look at:<\/p>\n<ul>\n<li>the height under the beams;<\/li>\n<li>the insulation of roof and walls;<\/li>\n<li>the doors: how many, how long they stay open, whether they leak;<\/li>\n<li>the skylights;<\/li>\n<li>the location, which sets the outdoor design temperature.<\/li>\n<\/ul>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><picture><source media=\"(max-width: 767px)\" srcset=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-potenza-wm3-en-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-potenza-wm3-en.jpg\" class=\"lazyload\" alt=\"Same 400 m\u00b2, different power: about 10 W\/m\u00b3 if the building is insulated, 25-40 W\/m\u00b3 and more if it is poorly insulated and the doors leak\" width=\"1672\" height=\"941\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-potenza-wm3-en.jpg\" alt=\"Same 400 m\u00b2, different power: about 10 W\/m\u00b3 if the building is insulated, 25-40 W\/m\u00b3 and more if it is poorly insulated and the doors leak\" width=\"1672\" height=\"941\"><\/noscript><\/picture><figcaption>Same 400 m\u00b2, different power: about 10 W\/m\u00b3 if the building is insulated, 25-40 W\/m\u00b3 and more if it is poorly insulated and the doors leak.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s3\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">03<\/p>\n<h2>The real number comes from the heat load calculation<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>The real number is the heat loss calculation to EN 12831, made when a building is designed or refurbished: roof, walls, windows and doors, air changes. If it exists, the machine is chosen on the numbers. If it does not, or the building has changed, a site visit is needed.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s4\" class=\"sec duo chiara inv\">\n<div class=\"wrap larga\">\n<div class=\"testo\">\n<p class=\"num\">04<\/p>\n<h2>The rule of thumb<\/h2>\n<p>From 150 to 500 m\u00b2 one Kita Air is usually enough, from 600 to 1,000 m\u00b2 two. Old buildings are usually kept cold: with one machine a poorly insulated building stays around 15 degrees, and those who have one often make do with it.<\/p>\n<\/div>\n<div class=\"foto\">\n<figure class=\"wp-block-image size-large\"><picture><source media=\"(max-width: 767px)\" srcset=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-termometri-en-telefono.jpg\" \/><img decoding=\"async\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-termometri-en.jpg\" class=\"lazyload\" alt=\"Same Kita Air, 0 \u00b0C outside: 22 \u00b0C in the insulated building, 15 \u00b0C in the poorly insulated one\" width=\"1672\" height=\"941\"><noscript><img decoding=\"async\" src=\"https:\/\/templari.com\/wp-content\/uploads\/2026\/10\/capannone-termometri-en.jpg\" alt=\"Same Kita Air, 0 \u00b0C outside: 22 \u00b0C in the insulated building, 15 \u00b0C in the poorly insulated one\" width=\"1672\" height=\"941\"><\/noscript><\/picture><figcaption>Same Kita Air, 0 \u00b0C outside: 22 \u00b0C in the insulated building, 15 \u00b0C in the poorly insulated one.<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s5\" class=\"sec duo senza\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">05<\/p>\n<h2>Where the heat goes matters too<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>In a tall building warm air rises under the roof and people working in the first two metres stay cold. That is why it is not only the kW that count, but where they go. The Kita Air split unit has a Venturi tube deflector as standard: it mixes the warm air with the air of the building and throws it out lukewarm, in much larger quantity, so it does not rise straight to the ceiling. In tall buildings the floor-standing unit draws air from below and sends it back with motorised louvres that form an air curtain: the heat stays on the floor, where it is needed. We covered this in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-industrial-building-drawbacks-and-solutions\/\" rel=\"noreferrer\">article on the drawbacks of a heat pump in an industrial building<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s6\" class=\"sec duo senza chiara\">\n<div class=\"wrap larga\">\n<div class=\"testa\">\n<p class=\"num\">06<\/p>\n<h2>Neither too big nor too small<\/h2>\n<\/div>\n<div class=\"testo\">\n<p>Fitting two machines where one is enough is not caution: a heat pump that is too big always runs at minimum and switches on and off all the time, as explained in the <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-inverter-sizing-half-capacity\/\" rel=\"noreferrer\">tip on sizing<\/a>.<\/p>\n<p>To know how many Kita Air units your building needs, the floor area, the height under the beams and the year of construction are enough. Write to us from the <a href=\"https:\/\/templari.com\/en\/air-to-air-heat-pumps-34-48-kw\/kita-air\/\" rel=\"noreferrer\">Kita Air page<\/a>.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"s7\" class=\"sec faq\">\n<div class=\"wrap\">\n<div>\n<p class=\"num\">07<\/p>\n<h2>Frequently asked questions<\/h2>\n<\/div>\n<div>\n<details>\n<summary>How many kW does a 400 m\u00b2 industrial building need?<\/summary>\n<p>One Kita Air is usually enough. The real figure is calculated on volume: a 400 m\u00b2 building 7 metres high has 2,800 m\u00b3, multiplied by the watts per cubic metre, from about 10 if it is insulated to 40-60 and more if it is not.<\/p>\n<\/details>\n<details>\n<summary>How many heat pumps does an industrial building need?<\/summary>\n<p>From 150 to 500 m\u00b2 one Kita Air is usually enough, from 600 to 1,000 m\u00b2 two. It depends on height, insulation, doors, skylights and climate zone.<\/p>\n<\/details>\n<details>\n<summary>What is checked during a site survey?<\/summary>\n<p>The clear height under the beams, roof and wall insulation, the doors (how many, how long they stay open, whether they leak), the skylights and the location, which sets the design outdoor temperature.<\/p>\n<\/details>\n<details>\n<summary>How do you stop the heat staying under the roof?<\/summary>\n<p>By distributing the air. The Kita Air split unit has a Venturi tube deflector as standard that mixes the warm air with the air in the building; in tall buildings the floor-standing unit sends out an air curtain that keeps the heat at ground level.<\/p>\n<\/details>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"fine chiara\">\n<div class=\"wrap\">\n<p class=\"tpl-vedi-anche\"><strong>See also:<\/strong> <a href=\"https:\/\/templari.com\/en\/news\/how-much-electricity-does-a-heat-pump-use\/\" rel=\"noreferrer\">How much electricity does a heat pump use: per day, per year and by size, with the data sheet figures<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/news\/heat-pump-and-photovoltaics\/\" rel=\"noreferrer\">Heat pump and solar panels: how much the roof really covers, month by month, and how to make them work together<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/news\/air-to-air-heat-pump\/\" rel=\"noreferrer\">Air to air heat pump: how it works, pros and cons, and when it makes sense for heating<\/a> \u00b7 <a href=\"https:\/\/templari.com\/en\/workshop-heating\/\" rel=\"noreferrer\">Workshop heating: diesel heaters, infrared or a heat pump<\/a><\/p>\n<p><em>All the technical tips are on the <a href=\"https:\/\/templari.com\/en\/technical-tips\/\" rel=\"noreferrer\">series page<\/a>. The next one in two weeks.<\/em><\/p>\n<\/div>\n<\/section>\n<\/div>\n<p><script>(function(){var a=[].slice.call(document.querySelectorAll('#aa .subnav a')),n=document.querySelector('#aa .subnav'),h=document.getElementById('header-outer');function u(){if(n&&h)n.style.top=Math.max(0,h.getBoundingClientRect().bottom)+'px';var y=window.scrollY+200,c=null;a.forEach(function(l){var s=document.querySelector(l.getAttribute('href'));if(s&&s.offsetTop<=y)c=l});a.forEach(function(l){l.classList.toggle('on',l===c)});if(c&#038;&#038;c!==u.c){u.c=c;c.parentNode.scrollTo({left:c.offsetLeft-20,behavior:'smooth'})}}window.addEventListener('scroll',function(){u();setTimeout(u,400)},{passive:true});u()})();<\/script><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How many kW does a 400 m\\u00b2 industrial building need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"One Kita Air is usually enough. 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