The financial journalist gave some advice to listeners to his BBC podcast about how best to use timers and thermostats. As freezing temperatures have arrived in Britain this week, he spoke about a mistake people make when setting their heating because of the cold weather.
He said: âMany people, when it gets cold as itâs happening right now, they turn their thermostat up, with the idea that that will make them warmer.
âWell no it wonât. If your thermostat is set to the right temperature, itâs set to the right temperature.
âYes, youâre going to have to wait for it to get up to that heat, but donât start setting your thermostats higher just because itâs colder.
âThe thermostat takes you to a certain temperature, thatâs its entire raison dâetre. Timers and thermostats are very powerful tools.â
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He also said people often misunderstand the impact turning down the thermostat by just one degree can make on a householdâs energy usage.
While admitting this example is not an exact science, the savings expert commented: âSay your thermostat is currently set at 21 degrees and youâre dropping it to 20 degrees, that sounds like itâs not very much. But of course, weâre just comparing it to zero degrees, which is an arbitrary figure.
âIn reality, your house may only be heating from 16 degrees up to 21 degrees, and in that case dropping from 21 down to 20 is a fifth of the energy usage, itâs 20 percent of the energy usage. Which is why dropping by one degree can have a really big impact.â
The World Health Organisation recommends 18 degrees as a suitable home temperature for healthy people.
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Mr Lewis encouraged listeners to set their thermostat at the temperature that best suits their needs, but also to experiment with turning down the heating if they can.
He said: âYou need to set it at the rate that you feel is comfortable for you. Of course, older people and those with medical conditions will want it warmer than that.
âBut my suggestion would be, try dropping one degree on your thermostat, see how it feels, and if you donât notice much difference, that can be a big saving.â
Mr Lewis also told listeners about how they could slash their gas bills by nine percent, by turning down the setting on their boiler.
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He commented: âIf you have a gas combi boiler, which is the type most homes have, the flow rate on most of those boilers are set too high as a default.
âThe flow rate is the temperature of the water that circulates around the system. If itâs too high, the boiler isnât operating to maximum efficiency.
âChanging your flow rate can cut gas bills by over nine percent and you wonât notice the change.â
He also mentioned The Money Saving Boiler Challenge, a project which is completely separate from Money Saving Expert, which Mr Lewis founded.
The challenge encourages Britons to turn down the flow temperature on their combi boiler to 60C or below, as this can âknock pounds off your heating bill each year and reduce energy waste from your homeâ.
Flow temperature refers to the temperature a boiler heats water to before it goes around the radiators of a property.
The Energy Price Guarantee came into effect at the start of October, capping the price of energy but still meaning bills rose significantly, to on average ÂŁ2,500 a year, for typical households.
The cap relates to the unit price of energy so people in larger households, which use more energy than on average, may well have larger bills.