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> Open windows when it's above 50F / 10C

https://www.rte.ie/weather/22259-dublin/

I live in Ireland, it's not typically considered a cold climate. But it won't be above 10C this week, and probably the case for most weeks until mid-March so this advice is less globally accurate than you might imagine.

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The forecasts for Dublin I'm seeing predict 10C or higher for most of Tuesday. Regardless, my advice is to keep the windows open where possible and it will offset the energy needed where it isn't. And the other component of my advice, turning down the thermostat in places where it gets cold, is certainly applicable in Ireland. You don't need 25C indoors in the winter.

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