With winter just around the corner, we'll no doubt be thinking of ways to heat our homes more efficiently.
Wales has some of the oldest housing stock in the UK and whilst new build houses are energy efficient - there's much work to be done to retro-fit older properties.
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The Welsh Assembly's Climate Change, Environment and Rural Affairs Committee is launching an inquiry into how to make Welsh homes as energy-efficient as possible, and examine potential barriers.
The Welsh Government says it welcomes the inquiry, and adds that it will "provide an opportunity to demonstrate our excellent track record in this area and provide additional evidence to support the achievement of our emerging decarbonisation targets.”
Sian Cutter-Jones has lived in her terraced house in Gelli, Rhondda for ten years.
Until its recent renovation, she and her family found the cold temperatures in the house difficult to live with.
The house was chosen for a retrofitting trial carried out by Cardiff University.
The building has been substantially insulated, with a new heating system and solar panels on the roof.
Affordability and the environment are key in Bethesda.
100 homes are involved in a community energy project where they buy electricity generated by a hydro scheme at a reduced price.
Energy Local founder Dr Mary Gillie says it means more money is being invested in the community.
"More of their electricity bill is being given to the local hydro which is owned by the local people" she told ITV Wales.
"All the money to set this up in the first place was collected via a local share offer, so they're paid a dividend."
"When there's a surplus, that goes into a community benefit fund".
Wales has ambitious targets for how it generates electricity - aiming to get 70% of it from renewable sources by 2030.
The two big challenges - how we power our homes, and how we keep the heat in - are under more scrutiny than ever.
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