What COP, HSPF2, and SEER2 mean (and why HSPF1 was misleading).
The efficiency ratings explained: what they measure, how they're tested, and why the HSPF1-to-HSPF2 transition actually told you something useful about cold-climate performance.
Resources
Articles, technical notes, and the firm's reading list.
Engineering · Long-form
Engineering · Coming soon
Design · Coming soon
Project Phasing · Coming soon
Rebates · Coming soon
Heat pumps actually work in Vermont. Here's the engineering.
The technical case for cold-climate heat-pump performance, with COP curves, capacity-retention data, and field results from 47 data-logged Voltline installs. About a 12-minute read.
Read the article → Firm Position · Long-formWhy we don't install gas furnaces.
The firm's position on fossil-fuel heating equipment. Not a screed — a position paper. Covers the cold-climate performance reality, the operating-cost math, the embedded-emissions question, and the firm's scope decision. About a 10-minute read.
Read the article →Choosing between a ducted retrofit and a ductless mini-split: 5 questions.
The decision framework Voltline uses on a site visit. Spoiler: it has more to do with your existing ductwork condition and your envelope than with your aesthetic preferences.
Phasing whole-home electrification when you can't do it all at once.
How we sequence multi-year electrification projects to maximize rebate capture across phases and minimize disruption.
The IRA HEEHRA rebate, explained without the bureaucratese.
What HEEHRA actually is, who qualifies, what you have to document, and how Voltline handles the paperwork on your behalf.
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