I’ve got one of these , which appear fairly economical , that said I find more useful in the summer as it offers cool airflow and I know you have complained of heat in the past.

https://www.dyson.co.uk/fans-and-hea...l/white-nickel

According to Ben Gallizzi, energy expert at Uswitch, it'll cost you 19.8p to keep it running for 12 hours straight. If you had it on for 24 hours a day during a week-long heatwave it would set you back £2.77.