Blog
Notes from the crew. Sizing, ductwork, readings, and what the numbers mean.
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Sizing
2 Mar 2026
6 min
Heat pump or furnace? The load calculation decides.
What a Manual J actually measures, why the size of your old furnace tells you almost nothing, and the three numbers that settle the question for a Portland house.
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Ductwork
11 Feb 2026
5 min
Why we measure static pressure twice.
Total external static is the blood pressure of a duct system. Here is what the number means, what we found in a Sellwood closet, and why one reading is not enough.
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Commissioning
22 Jan 2026
7 min
How to read your commissioning report.
The one-page sheet we leave on the fridge has seven readings on it. Here is what each one means, what its target is, and what to do if a number ever drifts.
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Estimates
8 Dec 2025
4 min
What a 60-day fixed price actually means.
Our estimates carry one number and it does not move. Here is what is inside it, what could legitimately change it, and how a change order works on the rare day one is needed.
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