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I have a one pipe steam heat system in a 2 story house. The upstairs is consistently about 6 degrees colder. Currently, I have Maid-o-Mist #4 air valves on the first floor and Maid-O-Mist #5 valves on the second floor. Would I benefit from installing #6, C or D valves on the second floor? Should I consider TRV’s for the colder areas? Any other ideas?

I should mention that the basement mains are insulated and properly vented.

Thanks in advance…