Are you're radiators hot to touch? Does you're boiler have central heating temperature controls on it that need turning up. Is this a recent thing a house you just moved into or is the thermostat sat above a radiator?
Do you know what the setting on the boiler is, and which boiler is it.
How do you know the room temperature is 15C.
How long is the heating on for.
Is every room at 15C, or are some hotter or colder.
Are the radiators hot to touch, or are there cold spots on the bottom; are all radiators the same sort of temperature.
Do you have single, or double glazing.
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