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mhoush: Dehumidifier Sizing by Latent Load
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<meta content="This is a quick article to show how to calculate the size of dehumidifier needed based on the latent load of a building. This is useful if
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you’ve done a load calculation and know the latent load of the structure.
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Formulas
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The formula above is used to..." name="description"/>
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<meta content="This is a quick article to show how to calculate the size of dehumidifier needed based on the latent load of a building. This is useful if
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you’ve done a load calculation and know the latent load of the structure.
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Formulas
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The formula above is used to..." name="og:description"/>
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<h1>
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Dehumidifier Sizing by Latent Load
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</h1>
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<div class="-mt-6">
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<div class="text-gray gray-links text-sm">
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<span class="border-r border-gray pr-2 mr-2">September 15, 2023</span>267 words, posted in <a href="/articles/tag/hvac/">HVAC</a>, <a href="/articles/tag/design/">design</a>, <a href="/articles/tag/formulas/">formulas</a> and <a href="/articles/tag/tech-tip/">tech-tip</a>
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<img alt="banner" src="http://localhost:3000/articles/images/2023-09-15-sizing-dehumidifier-by-latent-load.png"/>
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<p>This is a quick article to show how to calculate the size of dehumidifier needed based on the latent load of a building. This is useful if
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you’ve done a load calculation and know the latent load of the structure.</p>
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<h2>Formulas</h2>
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<p>The formula above is used to solve for the pints per hour required to size a dehumidifier.</p>
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<table>
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<thead>
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<tr>
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<th>Where</th>
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<th></th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Ql</td>
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<td>Latent load</td>
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</tr>
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<tr>
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<td>Ph</td>
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<td>Pints / hour</td>
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</tr>
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</tbody>
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</table>
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<p>We can then convert to pints per day by multiplying the answer by 24 hours, below is the combined formula.</p>
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<p><img src="/articles/images/2023-09-15-pints-per-day.png" alt="pints-per-day-formula" /></p>
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<table>
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<thead>
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<tr>
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<th>Where</th>
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<th></th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>Ql</td>
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<td>Latent load</td>
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</tr>
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<tr>
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<td>Pd</td>
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<td>Pints / day</td>
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</tr>
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</tbody>
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</table>
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<p>In some cases you may want to size the dehumidifier for less than the full latent load, assuming that the air-conditioner (when sized
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properly) is going to cover the full latent load when at peak design temperatures and that the peak latent period for your area is during
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peak cooling demand.</p>
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<h2>Example</h2>
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<p>Let’s imagine we have done a load calculation and have a latent load of 4,334 BTU/h. So, plugging that into our above formula.</p>
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<p><img src="/articles/images/2023-09-15-pints-per-day-example.png" alt="pints-per-day-formula-example" /></p>
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<p>Or if we just want to cover the latent capacity at 85% of the full latent load.</p>
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<p><img src="/articles/images/2023-09-15-pints-per-day-example2.png" alt="pints-per-day-formula-example" /></p>
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<p>This gives us some guidance that we would need to select a dehumidifier that is rated for 84-99 pints per day, depending on which condition
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we wanted to use.</p>
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<p>I don’t feel oversizing a dehumidifier, within reason, is that problematic (or at least it does not come with the same problems as an
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oversized air conditioner), so I would personally go for a 100-120 pint per day model dehumidifier in this application.</p>
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<p>Thanks for reading!</p>
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</article>
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<div class="border-t border-light mt-8 pt-8">
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<h2 class="text-4xl font-extrabold mb-8">
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Written by
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<div class="prose">
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<h3 class="!m-0">
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Michael Housh
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</h3>
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<p class="text-gray">
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HVAC business owner with over 27 years of experience. Writes articles about HVAC,
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Programming, Home-Performance, and Building Science
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</p>
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More articles
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<a class="[&:hover]:border-b border-orange" href="/articles/2025/vapor-htmx-todo-app/">Vapor + HTMX</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">January 05, 2025</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/programming/">programming</a> and <a href="/articles/tag/software/">software</a>
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<p>
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<a href="/articles/2025/vapor-htmx-todo-app/"><div>
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Build an example application using Vapor and HTMX.
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</div></a>
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</p>
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<h2 class="text-2xl font-bold mb-2">
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<a class="[&:hover]:border-b border-orange" href="/articles/2024/free-as-in-freedom/">Free As In Freedom</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">April 09, 2024</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/open-source/">open-source</a> and <a href="/articles/tag/software/">software</a>
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</div>
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<p>
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<a href="/articles/2024/free-as-in-freedom/"><div>
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Salute to open-source software engineers
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<a href="/articles/">› See all articles</a>
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