Amply

Introduction to Manual J load calculations and why they are important

Overview of Manual J

Manual J is designed to be used for residential buildings only that have three or fewer above-grade stories

Can I use Manual J for commercial buildings?

How design conditions are set automatically and how they can be adjusted per local code requirements

What are design conditions and how can I change them?

How to set infiltration load calculations with the tightness or blower door method

How to measure air infiltration and update calculations in Amply

Learn how we set starting assumptions using the year built and location of a home

Smart starting assumptions for insulation, windows and air leakage

How to model losses and gains for ductwork in unconditioned space

How do I model ducts?

Background on how CFMs are calculated and how they should (and should not) be used

Approximate airflow CFMs for cooling or heating

Use a flash light, lighter or laser to quickly verify glass type

How to determine if you have "low-e" or "clear" windows

Eric Fitz

Manual J background and how to fine tune your designs

Manual J and Load Calculations

Find answers and get help from Intercom Support and Community Experts

This site employs cookies and other technologies that we and our third party vendors use to monitor and record personal information about you and your interactions with the site (including content viewed, cursor movements, screen recordings, and chat contents) for the purposes described in our Cookie Policy. By continuing to visit our site, you agree to our {websiteTermsLink}, {privacyPolicyLink} and {cookiePolicyLink}.

This site uses cookies and similar technologies ("cookies") as strictly necessary for site operation. We and our partners also would like to set additional cookies to enable site performance analytics, functionality, advertising and social media features. See our {cookiePolicyLink} for details. You can change your cookie preferences in our Cookie Settings.

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See our {cookiePolicyLink} for more details.

Advertising cookies are set by our advertising partners to collect information about your use of the site, our communications, and other online services over time and with different browsers and devices. They use this information to show you ads online that they think will interest you and measure the ads' performance. Social media cookies are set by social media platforms to enable you to share content on those platforms, and are capable of tracking information about your activity across other online services for use as described in their privacy policies.

These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.

These cookies are necessary for the website to function and cannot be switched off in our systems.

These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site.

You have the right to opt out of the sale of your personal information. See our {cookiePolicyLink} for more details about how we use your data.

Your Privacy Choices

We use cookies to enhance your experience. You can customize your cookie preferences below. See our {cookiePolicyLink} for more details.

Cookie Settings

Empty Help Center

Uh oh. That page doesn’t exist.

Home

Search results

Disappointed

Neutral

Smiley

Thinking...

Searching through sources...

Analyzing...

Tickets submitted through the messenger or by a support agent in your conversation will appear here.