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Radiator help for a newbie homeowner
I'm going into my second winter at my house and have learned a good amount about my steam radiators through the first winter. A little background, it's a 2 family home and I live on the second and third floors in one unit. I have a few questions I would like insight on:
1. My third floor is a converted attic that is now a master suite with half bath. There is no direct heat source and it is typically 5-10 degrees colder than whatever I keep my second floor heat set to. It is not the best insulated so the colder it is outside the larger the difference is between the two floors. I was wondering if there is a way to split off one of the radiator valves from the second floor so that it can continue to fill that radiator but also give me the opportunity to extend a pipe into the third floor to provide heating there, without having to run a pipe all the way from the basement. (The other options I've considered are a mini split or running gas up and using a wall furnace. For reference it is about 425 sq ft and not the best insulated)
2. I noticed that all my radiators get hot on the top half but stay cold below. My research has shown me this is likely sludge build up. I was told elsewhere that this isn't the case with steam radiators so now I'm curious what could be causing them to only half heat. If I can get them all to fully heat I'm sure I could cut a good sized chunk off my gas bill in winter.
3. What kind of maintenance can/should I be doing for my boilers and radiators to keep them running as efficiently as possible?
Thanks for any insight that can be provided!