Record energy in kWh as well as pounds, the tariff dates, occupancy and any major change in comfort or usage. For heating, note that a colder winter can change demand. Separate measured results from an installer’s forecast. REH suggests sharing a small, anonymised summary so others can understand the comparison without seeing your bill, address or account details.
Join the discussion: Which improvement are you measuring, and what comparable records do you already have?
Suggested next step: Keep an anonymised performance record and use it for an installer follow-up where needed.
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