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We have a 3.5 story house with a 1-story, 12 foot rear extension on the garden level. The extension is new masonry wall construction with insulation in the walls and roof.

This part of the house loses heat much faster than the rest of the house. We have a one-zone old fashioned steam heat system that is functioning well. Although the rooms in the extension heat up fine when the heat is on, matching the thermostat temperature, they cool off much faster, uncomforatbly so, while the rest of the house retains its temperature. Therefore, as it stands, the only way to keep these rooms warm is to overheat the rest of the house.

Short of ripping open the walls and putting in heavier duty insulation, any thoughts on ways to contain the heat in this part of the house?