One of the challenges of living in an older house is keeping your energy costs down. Here are a few strategies to increase your home’s energy efficiency.Insulate Adding another layer to existing insulation can help maintain a comfortable temperature throughout your house, which allows your HVAC system to work more efficiently. Use LED Light Bulbs It might be time to update your light bulbs if you’re still using the incandescent variety. LEDs use 90% less energy than traditional bulbs and can last up to 25 times longer. Fix Drafty Doors and Windows Simply caulking or applying weather stripping around doors and windows can save you up to 20% on energy costs. Or consider replacing old doors and windows with new, vintage-style replicas. Add a Heat Pump Energy-efficient heat pumps heat and cool a home, so you won’t need separate heating and cooling systems.