apartment house 80 familes --natural gas heating

i need info apartment house natural gas furnaces for 80 family house looking for very high efficiency unit
getting info about converting from oil to natural gas--trying to convience the owner --as current oil burner might as well just heat the outside air
done some searching to no avail
any help really appreciated
tia peter
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Assuming that gas is available at the site, have the gas utility do an "energy audit" on the building and make a recommendation. Then get a HVAC contractor or three to make a recommendation for replacing the system. Ask them for estimates on the savings. But, the best information would likely come from an engineer who designs such systems. That would probably involve a sonsulting fee though.
You may be able to do the economic analyses yourself; but the furnace information is only one part of the heating information that you would need.
TKM
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super thanks peter

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