My question is this: If I don't intend to heat the basement, is there any reason to keep any of the vents (either return or supply) opened within the basement itself? To me this seems like a waste of heating power.
Am I correct in thinking I can simply close off all the supply air vents and all return vents within in the basement itself, and this will cause the heating system to focus on the main living areas? (By the way, the house I just sold had LOW heating bills and I did not have ANY supply or return vents opened in the basement (there was only one return and one supply and I closed both of them all year)
One problem is the return vents in the new townhouse do not have any built-in adjustment lever that would allow for closure. Can I just use the magnetic covers (designed specifically for this purpose) to close them?
Another question: besides the basement, my townhouse has 2 levels. I noticed that, by default, more air flow comes out of the downstairs vents. Is it more efficient to keep the downstairs supply vents *partially* closed to allow for more airflow upstairs, or would it be more efficient not to do that since the heat will tend to rise even with less forced air flowing out of the of upstairs vents vs. the downstairs vents?