Getting ready to finalize HVAC system for new 58,000 s.f., 3 story wooden frame 36 unit condo building in Columbia,SC.
Mechanical engineer has recommended a centralized roof top air cooled package unit to handle AC for apartments with electric resistance heating in each apartment's airhandling closet. Another option mentioned was to use individual heat pumps for each apartment mounted on the roof...although we're not real excited about doing that. Cost is of course a factor in our decision. We don't want to use any thru-the-wall type systems although magic-pak type might be a consideration if no ther good options.
No problem with centralized packaged unit, my question is the method of heating. I'm concerned about electric cost for heating. I realize that having the electric resistance heating in each airhandler gives each apartment control over how much heating they need which is important plus.
Is my climate reasonable enough not to be concerned with this configuration vs. something else or am I in for major eelctric bills in the winter?