i currently set my central heating to come on in the morning and evening,
but have just installed a programmable thermostat which allows me to select
different temps for different times of the day.
Is it better to have the heating 'on' but at a slightly lower temp settting
during the day when i'm out, and overnight, or is it more economical just to
have it switch on a bit before i get up, and just before get home from work.
someone told me it is more economical to have the heating on constantly, but
couldn't explain whiy...is this true and why??
This is similar to the old fallacy where people think it's more
economical to keep their hot water cylinder hot all day rather than
'losing' the heat and then heating it up again.
You will *always* lose more heat if you keep the house warm during the
day than if you don't. The overall energy loss (= cost to you) will
be some form of (temperature difference * time), thus the shorter the
time for which you keep your house warm the less it will cost you.
There may be good reasons for keeping the house slightly warm
when unoccupied but energy economy isn't one of them.
In every way I can puzzle it, the answer is no.
The only reason why it may be a bad thing to have heating off, is that
the boiler efficiency is lower at high peak loads needed to re-heat the
house whan it comes on...
Otherwise if the house is warm when it needn't be, its leaking more heat
than it needs to.
It isn't more economical. However, the effect will vary considerably
depending on your insulation levels. If you have excellent insulation, it
will make less of a difference in economy, whilst if you have no insulation
and a draughty house, it will make a huge difference.
The same is true of hot water cylinders. With modern levels of insulation,
there is no real reason not to run 24/7.
I can only speak for myself but as I work from home my heating is on
from 6am to midnight and apart from first thing in the morning the
heating rarely kicks in. I do however live in a new house which is
timber framed and stuffed to the gills with insulation so that
clearly has an effect.
IMO it is better to be on constantly, things like tiled floors are nice and
warm at all times. I used to have it timed, the CH would have to come on at
about 4:30 am - and be set quite high (no thermostat) - to make the house
warm enough for 7:00. Now I leave it on very low all over winter, haven't
noticed a huge rise in the gas bill.
Do you think there may be any truth in this suggestion .
Comfort levels are affected by wall temperature, the air temperature
may be warm but if the walls are cold you will feel cold as your body
radiates heat towards the cool walls.
Conventional block walls will, if left to cool TOO much will need
reheating to bring the comfort level back up. There might be a
tendency to overheat the room air temperature while the walls are
re-warming (since they have a certain thermal capacity and therefore a
thermal lag) , and thus use more energy.
(I wonder if timber framed houses are more comfortable than block
built houses for the same insulation level ?).
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