Having lived in many many Center City Condos over the years, here is what I believe to be the case in terms of costs to heat and cool a condo- Generally, you have someone living above you, below you, and on perhaps both sides of you, so your exposure to the elements is limited. It is not like you are living in a McMansion on the side of a hill in Ardmore. You follow me?
And heat has a tendency to emanate into your condo- you will probably be surprised how little heat you actually use. The fact that the majority of condos in town are one-level, your AC bills tend to be on the low side as well- It is not like you are trying to cool three floors. I live in a 1450 sq ft. condo in a newly constructed building here in town. My average electric bill is about $100 a month. I pay no gas, no water- both covered by the condo fees. When I lived in a 2200 sq ft converted loft, my bills were about twice that- but lower than I could have ever paid in a single family home somewhere….