Windows and Doors | Stop any heat leaving the house by sealing leaks and cracks. Check the rubber seal around doors, see if you can see anything light coming through to indicate if the seals are broken. Invest in inexpensive caulk to seal up any cracks in windows. You can also install plastic window treatment, especially if you have single pane windows. 

Upgrade your Thermostat | Make the switch to a programmable thermostat, and no longer have to constantly be changing the temperature. They help save money because you get to decide when the heat will go on and off. When you know you’ll be home and will want the heat on, you can programme it to kick on then, and then programme it to go to a lower setting when you know you’ll be out of the house or when you go to bed.

Better Insulation | If you own an older home, a big loss of heat is through the lack of insulation, find out what kind of insulation you have and where you need to add to it. The attic is a popular place for heat to escape. Check stairs, trapdoors, and vents, to make sure they’re properly sealed and insulated.

Deprioritize Unused Rooms | Heating your entire home seems silly if you’re only using a couple of rooms in the house. You could invest in an electric fireplace/heating for rooms that are used often or even heated flooring in places like the kitchen or bathrooms. You can also shut the door or close vents in rooms not being used.

Simple Actions | Do the little things like letting the sun in during the day and closing the blinds at night to avoid a chill. Have your ceiling fans going clockwise at a low speed, since warm air rises, this pushes the heat back downwards. 

Keep Things Clean | Keep vents and radiators clear, if you’ve got the heat going, you don’t want it being blocked by a piece of furniture preventing it from circulating around the room. 

Change air filters, allowing hot air to move easier, can be changed monthly - or whenever it’s dirty.