Who publishes these pages?
Igor Ivitskiy. PhD in mathematical modelling. UK homeowner, working out cooling for his own house. No other credential is claimed on this site.
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These pages are a local build with no form backend. To correct a figure, keep the page address, the value you saw, and the source you checked. Outcome reports — installed or not, and the decibel level at the neighbour's window — are not collected until the site has a server. Nothing here is a confirmed installation count.
The calculation rules and the caveat live on the methodology page.