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The decision layer for home energy.

Decisions you can defend,home by home.

Aeterno maintains a governed model of each home, with or without data from it.

  • Which homes first.
  • What gets each one to target.
  • What it costs.
  • Whether it performed as promised.

Your systems stay. You set the policy.

See how it works
The problem

Every decision rests on a modelled number.

Britain is electrifying its homes. Most of the numbers behind that work are assumptions, and assumptions die at handover.

  • Heat pumps are sold on numbers nobody can stand behind.
  • What was promised at design is never checked in operation.
  • Retrofit budgets are spent on faith.
  • Funding that cannot be evidenced does not stay funding.
What we do

Numbers you can stand behind, for every home you answer for.

  • Sell on numbers that survive the install.
  • Check the design promise against the home as it runs.
  • Spend retrofit budgets on evidence, not faith.
  • Keep funding, because you can prove what it paid for.

One live model per home makes that possible. Born at design, kept true as evidence arrives, every number carrying its source and its validation status.

The model that satisfies compliance at design is the same one checked against reality in operation. Most tools live on one side of that line. We keep one model across it.

The certificate says 5.0. We modelled the year it never mentions.

Exhibit 02The certificate and the year it never mentions
Modelled data — not a test rig
homes, modelled hour by hour
24,931
simulated to build this exhibit
218 million hours
of homes below the certificate figure
91%
The yearOne fleet, day by day
What the certificate says. It never changes.What the fleet delivers, day by day (p25–p75, line = median)
Day of the simulated weather year

11 summer days had no qualifying heating demand — the band breaks there rather than interpolating.

The homesWhere every home lands
Certificate figure — SCOP at 35 °C flow, test rigCertificate figure at 55 °C flow
Modelled seasonal efficiency in the home (SCOP)

One dot per home — all 24,931 homes drawn. Homes beyond the 2.0–6.0 range pile at the edges.

A small tail of homes models above the chart's range, mostly very low demand homes where the ratio runs high; they are drawn folded into the end columns.Modelled: one certified 8.5 kW air source heat pump, installed in 24,931 homes reconstructed from public EPC records, Greater London test reference year, full-year hourly simulation, 55 °C design flow. Certificate values from the public record.Aeterno exhibit series: 01 Technology · 02 Home · 04 Housing & Place

The claims we make cold, before any NDA.

Proof
  • In production with a global heat pump OEM.
  • Both calculation engines are cross-validated against output from government-approved SAP software.
  • The same engines power a reconstruction of UK housing stock covering around 18 million dwellings.
  • A live governed platform: every screen resolves against a governed viewpoint, and every claim carries its validation status, including the red ones.
  • Three patent families filed; the two covering this product were filed before any customer ever saw it.
Who this is for

Which one are you?

For Heat Pump OEMsKnow what a home needs before you spend.Keep knowing after.For commercial, digital and R&D leads at heat pump manufacturers.How this starts for OEMs For Housing & PlaceDecisions that hold up in front of the board, the funder and the resident.For asset management, sustainability and place planning teams at registered providers and local authorities.How this starts for Housing & Place