Here are some important things to consider:
Age
Newer houses or apartments built to newer building codes will generally cost less to heat or cool than older buildings. But if you’re looking at an older place, ask if it has any energy upgrades like replacement windows or weatherization.
Past bills
Ask if it’s possible to see past utility bills to get a rough idea of energy costs.
Location
In a multistory building, an apartment in the middle of the building is a little more insulated by the apartments above, below and on either side — and that may help save on heating and cooling.
Appliances
Newer models are more efficient. Look for the ENERGY STAR logo for ultimate savings.
Showerhead
Saving hot water saves energy. Look for the small numbers on the showerhead — you want to see 2.5 g.p.m. or lower (that’s gallons per minute). The lower the number, the more you’ll save.
Light bulbs
Are they LEDs? If not, install your own to save up to 85 percent on lighting energy costs.