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radiator capacity

This homeowner has one north-facing room on the first floor that is always about 3 degrees F below the rest of the building which is heated with one-pipe steam. I have put a big Gorton air vent on the rad in this room and replaced the on/off valve with a Gorton #1 (or #2, whichever is smaller). It gets real hot but doesn't keep up. The rad is 46 in long, 24 in high and 3 in thick.(see photo) The room is about 15' x 15' and about 11 ft high. Are the rad and room mismatched? I've thought about replacing the rad, adding a new rad or putting insulation between the joints in the basement (not heated except for whatever comes off the pipes). I should add that the room has two big windows about 7 ft high by 2 ft wide with old fashioned storm windows. Any advice on how to match rads and rooms would be greatly appreciated. Thanks.


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