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A building needs a certain amount of energy during a year (kWh) for room heating. An air to water heat pump has been installed to provide heat to a radiator system (55/40°C). How do I go about estimating how much of the yearly energy need the heat pump will cover? What confuses me is that the outside air temperature varies from -15 to +20°C during the year, and I don't know how to consider that variable. Not that I would know what to do if the outside temperature was fixed Does one usually use some average yearly temperature? Could anyone provide som basic procedures here? Thank you!