Reality
What actually happens in real homes.
Every domain on this site ends with the same question: does the recommendation survive contact with a real building, on a real tariff, in a real winter. The Reality layer collects the evidence, aggregate first, individual homes as they earn their place.
How the evidence bar works here.
Aggregate findings from named trials come first because they already carry statistical weight, a documented methodology and a publisher we can point to. Nesta's Electrification of Heat, the Salford Energy House experiments, the ESO smart tariff pilots and the annual Ofgem interruption data all belong here, cited to their original publication.
Individual homes are harder. A single write-up only earns a place when we can name the property archetype, publish the before-and-after measurement, disclose the tariff and metering setup, and link to the underlying data. Until each of those is true, we would rather show nothing than invent a case study; a fabricated success story is exactly the kind of evidence this site exists to replace.
If you have measured data from your own home you would let us publish, we're listening; see the contact page. Nothing goes up without your name on it and the raw numbers linked.
- Aggregate · Published trial
What 742 UK homes told us about heat pumps
The Electrification of Heat demonstration ran heat pumps in a representative sample of British housing. It's the closest thing we have to an honest national field test; here's what it found and what it doesn't tell us.
Read the outcomeLast reviewed 4 July 2026