Use warm air from loft space?
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booshank
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Use warm air from loft space?

by booshank » Wed Nov 23, 2011 11:06 am

On sunny days the air in loft spaces tends to heat up even if the air outside is cold. I was thinking that all that heat goes to waste as it's insulated from the house by loft insulation.

While making some thermostatically controlled fans for an electronics project, the idea came to me of putting something similar into the loft to pump the warm air into the house on cold days.

Anyone have any ideas on this? Seems technically fairly simple, but maybe I've overlooked some reason why it wouldn't be a good idea...

stoneyboy
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Re: Use warm air from loft space?

by stoneyboy » Tue Nov 29, 2011 9:45 pm

booshank,
Unfortunately lofts only get really hot on sunny days - days when the house underneath is warm anyway.
I guess you could try a heat recovery unit drawing warm air out of the loft and feeding it into the house but you are talking big money.
end

solarsecurity
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Re: Use warm air from loft space?

by solarsecurity » Sat Apr 28, 2012 9:05 pm

I have read forum posts about this before on other forums. Some people have suggested using piping which goes from the attic to the ground floor with a bathroom extractor fan attached at one end to direct the warm air to the ground floor. Pretty simple really!

htg engineer
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Re: Use warm air from loft space?

by htg engineer » Mon Dec 22, 2014 12:21 pm

The loft only gets hot on summer days, normally when you want the house to be cooler not warmer?

In the winter when you want heating the loft will be cold. You'd be better spending money on loft insulation to prevent heat rising and escaping through the loft/roof when you have the heating on.

jowie
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Re: Use warm air from loft space?

by jowie » Thu Oct 13, 2022 4:26 pm

I know this is an old topic, but I googled and this is the only thing I could find.

On a day like today (in October), while it is sunny during the day, my loft it several degrees warmer than the rest of my house: currently, it is 25.5ºC in the loft, while the rest of the house is about 19ºC and I've had to put the heating on for an hour or so. My loft has a roof window/skylight which seems to create a bit of a greenhouse effect. The previous owner had it put in. Should I:

- Get the window removed, therefore cooling down the loft
- Use the heat to my advantage somehow
- Forgot about the skylight and get solar panels installed!

It feels like I could do something like channel some thin pipes through the loft in order to make use of the wasted heat. But I guess that could be a very complex job, so perhaps I should just cover the roof in solar panels instead?

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