How do I adjust Honeywell RTH110B thermostat if house does not heat to set temperature?

I have already ruled out that there is nothing affecting the thermostat like a draft or direct sunlight to affect it.How do I adjust Honeywell RTH110B thermostat if house does not heat to set temperature?You can't adjust the stat. Are you sure there is enough output from the radiators to reach the set point? Is it extra cold just now?? Maybe you are losing too much heat through walls, draughts etc.How do I adjust Honeywell RTH110B thermostat if house does not heat to set temperature?When you pull the cover off there will be an adjustment slot on the cover. Check the temperature with a thermometer and adjust the setting accordingly. Pretty simple. Some have a thumb wheel. It is pretty easy.How do I adjust Honeywell RTH110B thermostat if house does not heat to set temperature?if it has a Mercury switch (little silver bubble inside) you have to have it level.How do I adjust Honeywell RTH110B thermostat if house does not heat to set temperature?lower the set point to satisfy it