I am intending on replacing my 50+ years old gravity furnace. This may appear straightforward, however I have an in-law apartment in the basement that I rent which needs upgrading. Currently I have a gas wall heater there, but according to current San Francisco codes, I cannot just replace it with the same.
Heating contractors have suggested a two zone system with a separate zone for the apartment, but other contractors have told me that two zone systems never work properly.
I'd appreciate any opinions or guidance. I'd prefer to stick with gas heating rather than an electric baseboard.
Thanks,
drdevi