1 - Seal the draughts in your home!
If you have cold draughts of air entering your home, you won't get the full effect of your heating system. Oftentimes your windows or doors can be poorly fitted, leaving cracks through which air can flow. On a cold windy day, attempt to find these cracks. You can do this by pure initiative, or by using a candle. Light the candle, and move it around a window or door. Watch the flame, and use the flame's reaction as guide to find the draughts.
Once you find the draught you can seal it using silicon or foam. Removing draughts from your home will make an immeasurably difference.
2 - Seal external holes.
If you have pipes or wires running from the interior of your home to the exterior of your home, it is unlikely that the hole in which it runs through has been sealed correctly. This can be a severe loss of heat. For example, if your kitchen sink sits against an exterior wall, the pipes beneath your sink probably run straight out. Check these pipes, and make sure you aren't losing a lot of heat through this hole.
3 - Adjust door thresholds.
Make sure your door is as tight to the threshold as possible. If it isn't tight, air can seep in and out. This is not a complicated procedure, but it can make a great difference to the loss of heat in your home. If you need some help on how to do this, you can watch a video here.
4 - Make use of curtains!
Using curtains correctly can make a huge difference to your home. If you have old windows in your home, chances are sealing the draughts won't help you much. We recommend buying big, heavy, curtains. Curtains can make a world of difference to your home. They aren't a permanent solution, but they do help!