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Failed NATE core exam twice — what am I missing in my study approach?

by Brian Y. 11 views3 replies
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Brian Y.OP
May 27, 2026

I've been in HVAC for about three years now, mostly residential install work, and I figured it was time to get my NATE certification. Took the core knowledge exam in January, got a 67 — needed a 70 to pass. Went back in March, same story. 68. I'm clearly close but something isn't clicking.

My prep so far has been reading through the NATE study guide and watching some YouTube videos on refrigeration cycles and electrical fundamentals. I've probably put in 30-40 hours total but it feels scattered. A coworker told me I should be doing a NATE practice test under timed conditions instead of just reviewing material passively — does that actually make a difference? I keep getting tripped up on psychrometrics and heat load calculations.

Anyone else struggle with the core before passing? What finally helped it click? I want to sit for the AC specialty after this so I really need to nail the core first. Shooting for a retest in July.

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Hannah K.
May 27, 2026
The timed practice tests were a game changer for me honestly. I failed once too and when I looked back at it, I realized I knew the material but kept second-guessing myself and running out of time. Once I started drilling practice questions with a timer going, my score jumped about 8 points on the next attempt. Psychrometrics specifically — draw the psychrometric chart by hand until it makes sense, don't just memorize it.
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Chris D.
May 28, 2026
Heat load calculations tripped me up too. What helped was actually doing Manual J calculations on real jobs during my day — like mentally running through it even when I didn't have to. The exam questions aren't always worded the way you'd expect from a study guide, so getting comfortable with the concepts in the field translates better than you'd think. Also check if your local RSES chapter does any exam prep nights, mine had one that was worth every minute.
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Tom W.
May 28, 2026
67 and 68 are so close, you're not far off at all. Tighten up on refrigerant laws and safety regs too — those questions are basically free points if you know them cold. Good luck in July, you've clearly got the fundamentals down.

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