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Where in the country do you live?
Did you already have a gas furnace and an AC unit?
3-tons is probably too much, but it depends on where you live and what
your insulation is.

Also, 75,000 BTU is also probably too much. It won't hurt anything, but you could lilkey save money with a smaller gas unit.

Tell us more about your existing heating and cooling setup. Model numbers, etc.
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