What does a summer of cooling cost?
The Daikin Perfera 2.5 kW (SEER 9.5) is £27.71 for 400 hours at the Ofgem cap of 26.32 p/kWh (25 Sep 2026, cap period 1 Oct–31 Dec 2026). The same 2.5 kW from a portable at EER 2.6 is £101.23.
estimate
Worked example, already calculated
£27.71
Split, portable and fan on the same tariff
A 100-hour slice of that summer scenario is £6.93 for the Perfera. 100 hours is one quarter of the 400-hour scenario used on the model pages, not a measured month.
Passport input of the Meaco portable (1.3 kW) run for 400 hours is £136.86. That unit is rated near 3.517 kW, so it is a larger machine than the 2.5 kW split. The equal-service column divides 2.5 kW by EER instead.
The fan figure uses 20 W taken from the retail title of Devola Devola Low Noise 20W 9 Speed 9-inch DC Desk Fan - White - DVF7DCFAN. The power-input column for that row is empty.
| Machine | Draw | 400 h | 100 h |
|---|---|---|---|
| Split, 2.5 kW ÷ SEER 9.5 | 0.26 kW | £27.71 | £6.93 |
| Portable, 2.5 kW ÷ EER 2.6 | 0.96 kW | £101.23 | £25.31 |
| Portable passport input 1.3 kW | 1.3 kW | £136.86 | £34.22 |
| Fan 20 W | 0.020 kW | £2.11 | £0.53 |
Next pages
Ofgem price cap; EPREL registration for daikin-perfera-2-5kw-rxm25a; retail row for the portable and the fan title · 2026-10-01 to 2026-12-31 · n=1 split registration, 1 portable row, 1 fan title · kWh = delivered kW ÷ SEER or EER, or the passport input; £ = kWh × pence/100. Hours are a scenario. · updated 25 Sep 2026 · version 1.0.0 · CSV of the values on this page
Source detail
https://www.ofgem.gov.uk/news/changes-energy-price-cap-between-1-october-and-31-december-2026