Install thermal shades.
When the sun is shining in your window, open your shades during the winter to let in the sun’s warmth and close the shades during the summer to block the sun’s warmth.
Get comfortable setting the thermostat 10 degrees cooler in the winter and 5 degrees warmer in the summer.
Make sure your furniture isn’t blocking heating vents, cold air returns, thermostats or air conditioners.
Upgrade to a more efficient air conditioner and make sure it is properly sized for the space.
Install a smart thermostat from $50 to $250 with your $50 rebate from Con Edison.