Cost to remodel the inside of a 696 sq ft house

[Tom Albares]

Hi, I have a 696 sq ft house in Cortez, CO.  We have already updated the outside of the house with a new roof, siding, windows, and doors.  We now need to remodel the inside.  It's two bedrooms, one bath, one kitchen, and a living area.  The plumbing and electrical will need to be updated.  It won't require an entire gut, but drywall work will be needed.  It will also require a new HVAC, as it currently has just a floor radiant heater.  Is there a rule of thumb per square foot on how much this should cost?   Thanks in advance