HVAC Heat Load Calculation (HAP): Step by Step Complete Guide with Practical Example (Software+Manual)
HVAC Heat Load Calculation (HAP): Step by Step Complete Guide with Practical Example (Software+Manual)
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Why enroll
What enrolled engineers say
Most courses throw pseudo-math at you, but the walkthroughs here read like something I’d put in a repo and sanity-check before a PR. The HAP run in the “Envelope Loads” section stuck with me, especially the moment where he tweaks the south-facing glass SHGC and you see the cooling tons jump; that mirrors the back-and-forth I’ve had on hvacr projects. It bridges old-school manual calc thinking with the software knobs, which felt like translating legacy arch into something you can operate in prod. I wasn’t sold on the early theory recap, and wished there was a tighter tie-in to how people actually document assumptions for handoff. still, the step where latent vs sensible gets reconciled before the final report was practical. The framing gives better ammo for conversations with PMs and inspectors that actually matter—less vibes, more numbers.
Needed material that would survive a tough PR, not just classroom math. The section on the HAP Zone Loads screen—where you reconcile ventilation latent loads against the Manual J worksheet—stuck, because it mirrors how we justify arch decisions before prod. it's mostly practical, mapping hvacr assumptions to checkable inputs like schedules and envelopes; I wasn't sold on the brief detour into reports formatting and wished there was more on code edge cases, but I've already dropped the repo link in team Slack.
Some steps around weather file setup felt rushed; the lab assumes HAP is already installed and licensed, which slowed me down. After that, the reasoning in the worked examples held up when I checked the math. The walkthrough of the Space > Loads > Infiltration tab, especially the 2,400 sq ft office example with 0.5 ACH, was clear enough to sanity-check line by line. As a freelancer, I liked how each assumption is traceable, similar to reviewing a PR where inputs are explicit and nothing’s hiding in prod. It bridges beginner to advanced without hand-waving. I’ve already mirrored parts of the load breakdown into our repo notes so infra decisions don’t rely on gut feel.
Is this course for you?
You should take this if
- You work in HVAC
- You're a Mechanical Engineering professional
- You have 3+ years of hands-on experience in this field
- You prefer self-paced learning you can revisit
You should skip if
- You're new to this field with no prior experience
- You need a different specialisation outside Mechanical Engineering
- You need live interaction with an instructor
Course details
Course suitable for
Key topics covered
Course content
The course is readily available, allowing learners to start and complete it at their own pace.
- A.1 Introduction: A Brief Introduction to HAP18 min
- A.2 Introduction: Route map to Our Learning4 min
- A.3 Introduction: How to install HAP software?3 min
- B.1 Weather Data: Weather Design Parameter Inputs11 min
- B.2 Weather Data: Design Simulation Inputs4 min
- B.3 Weather Data: Actual Weather Data Inputs10 min
- C.1 Schedule: Schedule for People7 min
- C.2 Schedule: Schedule for Light & Fan4 min
- D.1 Defining Wall & Partitions: U Factor Concept24 min
- D.2 Defining Wall & Partitions: How to Define Walls13 min
- D.3 Defining Wall & Partitions: How to Define Partitions?3 min
- E.1 Roof, Ceiling, Floor Inputs: Introduction5 min
- E.2 Roof, Ceiling, Floor Inputs: Roof3 min
- E.3 Roof, Ceiling, Floor Inputs: Ceiling2 min
- E.4 Roof, Ceiling, Floor Inputs: Floor3 min
- F.1 Windows & Doors: Window Details9 min
- F.2 Windows & Doors: Door Details10 min
- G.1 Shades: Introduction3 min
- G.2 Shades: How to define shades5 min
- H0 Space Inputs: Summary3 min
- H.1 Space Inputs: General12 min
- H.2 Space Inputs: Internals14 min
- H.3 Space Inputs: Walls, Windows, and doors10 min
- H.4 Space Inputs: Roof & Skylights4 min
- H.5 Space Inputs: Infiltration5 min
- H.6 Space Inputs: Floors above Conditioned and unconditioned Space7 min
- H.7 Space Inputs: Slab Floors on Grade & Below Grade5 min
- H8 Space Inputs: Partition11 min
- I.1 System Inputs: General6 min
- I.2 System Inputs: System Components14 min
- I.3 System Inputs: Zone Components2 min
- I.4 System Inputs: Sizing data & equipment2 min
- I.5 System Inputs: System input reports4 min
- I.6 System Inputs: System Design Reports19 min
- J.1 Practical Project: Weather Inputs11 min
- J.2 Practical Project: HAP Schedules & U Factors21 min
- J.3 Practical Project: HAP Space & System Inputs37 min
- J.4 Practical Project: HAP Outputs7 min
- J.5 Practical Project: Summary & 3D Model5 min
- J.6 Practical Project: Conclusion2 min
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What learners say about this course
Grabbed it over a weekend and figured I’d skim, but it moved faster than expected. The pressure class breakdown in Chapter 3, especially the rectangular-to-round example with the friction loss table, stuck; I’ve already reused that calc in prod conversations. hvacr arch choices are framed practically, not academic, though I wasn’t sold on the brief nod to retrofit constraints and wished for more on existing infra. it’s given me better ammo for the PRs and client calls that actually matter.
The scaling angle is what pulled me in, but module 4 dragged a bit and the labs assume you’ve already got your calc tools wired up. Past that, it maps cleanly to day‑job hvacr work. The Chapter 6 chilled‑water loop example stuck: the pump head calc tied back to ASHRAE 90.1 limits, then a quick check on N+1 sizing vs infra constraints. That’s the stuff I need before a design hits prod. The obs on control sequences vs actual arch tradeoffs felt real, not academic. Not perfect, but useful between meetings. Not something I usually pass along, but I will here.
The jump from junior rules-of-thumb to senior tradeoffs is made pretty explicit here, especially when the arch decisions start driving numbers. The ASHRAE 62.1 ventilation calc walkthrough in Chapter 5 stuck with me—the moment where the instructor sanity-checks the spreadsheet against a field obs and flags an over-optimistic diversity factor felt close to how reviews go in prod. wasn't sold on how briefly controls tuning was handled, and I wished there was more on commissioning handoff docs. Still, I’ll read future designs a bit more critically because of it.
Signed up to close a narrow gap before a facility migration, mostly around load calcs and controls handoff. The Chapter on psychrometrics where they walk a mixed-air calc line-by-line, then tie it to VAV box selection stuck. Felt like reading an arch PR: assumptions called out, failure modes noted; helped when sanity-checking vendor numbers in prod. wasn't sold on the brief BAS networking bit—wanted more on obs and CI-style commissioning; but it sharpened my sense of where abstractions leak between design and ops.
Oct 2, 2026 
