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Baseboard heat quality diminishes every year
We have a 1500 square-foot house in Pennsylvania. Purchased four years ago the baseboard heating work very well. I have noticed over the past four years that the system seems to struggle to get to 68° . Each year it takes longer and longer until last year it would only get to maybe 64 or 66 without the help of a electric space heater.
Furnace is well-maintained, oil, and I've had multiple people out to look at it. Nothing is changed with a system in this time. One person mentioned that the anti-freeze may have gone bad, and possibly that is the cause of the problems. But when I discuss this with multiple plumbers they all discounted it.
I understand the potential issues from bad anti-freeze and corrosion, but in your opinion is it possible that bad anti-freeze could affect the heating qualities of a baseboard system overtime?