Resources
Guides, briefs and how-tos on HVAC energy.
Short engineering and economics briefs on the problems HEDS was built to solve — written to be useful whether or not you ever buy anything from us. More guides publish regularly.
What is Low Delta-T Syndrome?
Why a 100-ton chiller often delivers only 67 tons, where the missing capacity goes, and how high-ΔT coil design gets it back — no new chillers required.
Read the brief →LL97 fines: the HVAC math for a 1M SF tower
$268 per metric ton over cap, ~$364K/year of exposure per tower at 2030 thresholds — and how a 50% HVAC emissions cut converts penalties into capitalized value.
Read the brief →Why your HVAC system makes you pay for energy twice
Over-cool to dehumidify, then buy new heat to warm the same air back up. The 100-year-old design flaw behind the largest controllable line on your operating budget.
Read the brief →ESPC & UESC: upgrades funded from the savings
How federal agencies modernize HVAC with no upfront appropriations, why guarantee-grade M&V is the gating item, and what the Seal Beach template proved.
Read the brief →The off-switch test
NREL disabled HEDS at the Timken Museum for one week. Electrical use jumped 87%, fossil fuel 129%. The cleanest causality test an efficiency technology can face.
Read the brief →Building health, owner wealth
Most mold, IAQ complaints and tenant churn trace to humidity control conventional HVAC can't hold. The root causes — and why fixing RH fixes retention and energy too.
Read the brief →More briefs publish regularly. Want one topic covered for your committee or board? Tell us what you're wrestling with →
Prefer the primary sources?
Every claim in these briefs traces to an NREL, DoD, GSA or CalNEXT instrumented study.