Research & field notes

What the research actually says about the equipment on your roof

Most HVAC writing online is either a sales pitch or a repeat of a number nobody can trace. These posts cite the study, name the authors, and link the document. Where good data doesn't exist, we say so instead of inventing it.

Field notes·8 min read

My Own Air Conditioner Was Undercharged for More Than a Year. Here Is What It Actually Cost.

I build refrigerant-side monitors for a living. The one on my own house caught a fault my house had been carrying for more than a year — and then my first estimate of what it had cost me turned out to be wrong by a factor of seven.

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Every figure on this blog comes from a named primary source — the Department of Energy, NIST, the EIA, national laboratories, the EPA and the CDC. Sources are listed at the bottom of each post. Figures we found but could not trace to a primary source were deliberately left out.