A live view · for housing and place
Where does a city's invisible heat go?
Nottingham: every home our stock model can price from public records, 107,336 of them, simulated through a full year, hour by hour. Choose a pipe run and an insulation state below, and the whole city answers at once: what that scenario sheds in a year, which wards carry it, and how far the real heating hours sit from the number the textbook assumes. Nothing here runs on your device; every figure is a verified, published record.
The story of these numbers: The heat a city cannot see.
If every run in the city were 5 metres of bare copper, the pipe alone would shed
71.2 GWh a year
6.0% of everything the cohort spends on space heat · median home 628 kWh a year
The formula is linear in length: about 14.2 GWh a year per metre of bare run, city wide.
Where it concentrates, ward by ward
Hover, tap or tab across the map to read a ward. Click to pin it while you change the scenario.
Twenty wards, 106,785 homes between them, every figure an aggregate of at least ten homes; the remaining 551 homes appear only in the city total. The shading is the selected scenario's annual loss per ward.
At 5 metres, the distance between bare copper and 25 mm phenolic is 59.7 GWh a year across the city, 5.0% of everything its homes spend on space heat. That is the part of the scenario that insulation, fitted once, holds back every year after.
The hours behind every cell
A pipe sheds heat while the heating runs, so the loss follows the hours. The textbook season is 1,800 hours; the city's median home heats for 3,592.
Bar area is proportional to homes; wider bars are small groups merged to keep every group at ten homes or more. One home in ten heats for fewer than 2,474 hours; one in ten for more than 5,175.
What this view shows, and what it does not
- It shows a stated scenario priced over the cohort's real simulated heating hours, never a claim about any particular home's pipe.
- It shows aggregates only. The smallest group on this page is ten homes; no address, identifier or figure for a single home is published.
- The formula and its constants are stated in full below. The records for individual homes behind the aggregates stay in the governed record, where readings for a named place can be requested.
Ask this about your place
Nottingham is one city, compiled from records that are already public. The same cohort can be built for any city, borough or patch in England, and the same questions asked of it. Name yours and we will return the first cut: the homes, the hours, and what the scenario says at ward level.