Warm air goes up, and duvets trap heat pretty well.
The weather is already quite chilly, but not really cold yet. By this time, I usually would have turned on my central heating. However, I found that all I need was about 20 minutes of that fan. Is that economical?
Lets check the cost!
2.4 x (20/60)hour x unit price =0.8 x cost/unit of electricity for one day of heating.
The cost of day time electricity for my tariff was 17.5 pence/unit.
Therefore, if I use the fan for 20 minutes a day, the cost is 0.8 x17.5 p =14pence per day.
In one month, it would cost me around £3.50.
The cost would go up to £5.20 per month if I use it for 30 minutes per day.
Therefore, despite the bad reputation of fan heaters, it is actually cost saving if you consider that you can use the other sources of heating less or delay turn on your central heating!