FOR TECHSFIELD NOTES
For the trade.
Combustion analysis, CO detection, airflow, code updates and Hampton Roads shop talk — written for HVAC techs, not homeowners. Jargon welcome.
Combustion & COCode & Refrigerant WatchMeasure & ProveShop Talk
Fall combustion analysis: reading what the analyzer is actually telling you
CO air-free, O2, stack temperature and efficiency — what each number means, where the probe goes, and which readings mean stop and investigate.
Kirby Johnson · Oct 22, 2026Read the postCombustion & COAmbient CO testing: why I carry a low-level monitor into every house
Standard CO alarms are built not to sound at low levels. What UL 2034 alarms actually respond to, BPI ambient action levels, and how low-level monitoring changes the customer conversation.
Kirby Johnson · Oct 22, 2026Read the postCombustion & COClocking the gas meter: the two-minute test that tells you the truth
How to verify a furnace’s actual firing rate with a stopwatch and the meter dial — and why nameplate faith is not a commissioning method.
Kirby Johnson · Oct 22, 2026Read the postCode & Refrigerant WatchThe GFCI fight is back — and it’s your callback now
The GFCI exemption expired September 1, the extension was denied 10–10, and the appeals are in — what it means for your installs and your callbacks.
Kirby Johnson · Oct 5, 2026Read the postMeasure & ProveWhy I measure static pressure on every maintenance
The blood-pressure analogy, NCI’s pressure budgets, and what two minutes with a manometer tells you that a visual inspection never will.
Kirby Johnson · Oct 3, 2026Read the postCode & Refrigerant WatchNew refrigerant rules: what actually changed for Virginia techs
The AIM Act GWP≤700 rule, R-32/R-454B reality, A2L handling basics, and the scrapped install deadline nobody told your customers about.
Kirby Johnson · Oct 3, 2026Read the postShop TalkRunning an honest one-man shop
No upsell culture, no blue-light pitches, pricing maintenance so you can afford to do it right — and why "your system is fine" is a complete sentence.
Kirby Johnson · Oct 3, 2026Read the postFOR THE TRADECONTRACTOR RESOURCES
Need a load calc or a price book?
We offer Manual J, D & S load calculation services for Hampton Roads projects, and our Housecall Pro price book as ready-to-import CSV packages tiered by company size.