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Hi Everyone, our co-op (4 floors, 8 apts) has 3 steam radiators in each apt. The problem is that the apts on the first floor tend to not get as warm as the upper apartments since the thermostat is on the 2nd floor, heat rises, and the basement cold air comes up to the apts. We are trying to figure out how to get the 1st floor apts warmer without overheating the upper apartments since those are already warm. We are discussing using these ‘thermostatic valves’ on the radiators in the apartments that are already warm so they can turn off when it gets warm there while the lower apartments continue to get heat. I have some questions:
1. Does anyone have any experience with these things?
2. Would we also have to raise the thermostat in addition to installing these?
3. Where can we buy them cheaply in NY?
4. Anything else you can tell me about these, or any other ideas to fix our situation?

Thanks for your help!