People are being encouraged to reduce their energy usage, and save money, this week.
It's part of a Home Energy Challenge from the Sustainable Energy Authority of Ireland (SEAI).
The event is running from November 29th to December 5th, showing people how they can be more energy efficient at home.
Those who sign up will get a daily e-mail with resources and advice covering topics such as heating, hot water, home appliances and transport.
Susan Andrews is marketing campaigns manager with the SEAI.
She told Newstalk Breakfast turning down your thermostat can make a big difference.
"In our living spaces, the recommended temperature is 20° - we do tend to have it a little bit higher.
"But even dropping it one degree, you could be saving up to 10% on your energy bills.
"It's a five-day challenge, and once you register... you will get a daily e-zine from us.
"And it's really quick tips to help you look at how you're using energy in the home".
She says simple actions can save you money.
This includes turning down the thermostat, only heat areas you use, service your boiler regularly, and to use any heating controls that are available to you.
"In the e-zine we have big actions as well - so we are encouraging people to look at insulating your home.
"Ultimately if you can make that investment, even with the likes of attic insulation, you're going to really keep your valuable heat in.
"You are losing 30% of your heat through uninsulated walls and attic spaces".
But she says smaller behavioural changes will also help - such as using energy efficient lightbulbs, washing clothes at lower or eco-friendly settings, and taking appliances off stand-by mode.
"All these tiny little things: they might sound small, but collectively if we're all doing our bit to reduce our own carbon footprint collectively it's going to have bigger impact.
"And it's going to save you in the long run".
People can sign up to the SEAI Home Energy Challenge here