Instead of turning up the heater, wear another layer of clothing so as to raise your body temperature which is more effective in providing you with warmth.
Wearing a hat or beanie inside and outside your house will keep you warm, as covering up any exposed area protects your body from losing its heat.
Turning on the ceiling fan on a low setting and in clockwise direction will bring down the warm air that usually goes up to the ceiling.
Alternating between hot and cold water in the shower will improve blood circulation and keep you warmer.
Baking or using the oven when cooking will keep you and your house full of heat and warmth.
Instead of pushing your bed directly against the wall, leave some room between the bed and the wall which will make you feel warmer.
Try to stop yourself from shivering, as it signals to your body that you're freezing and need to move to a warmer place. See also Why some people hate winter
Drinking soothing, warm beverages will raise your core temperature and keep you warm.
Wearing thick or woolen socks will keep your body temperature from seeping through your limbs.
Staying active through running, dancing, jumping or exercising will heat up your body and keep you warm. See also Why some people prefer winter over summer
Lighting some candles around your house will make you feel warm.
Cover any bare floors with a carpet or rug, as its coldness will spread to your body if you walk on it during winter.
Hang curtains over the windows in your house to block any drafts of air that come in.
During the day, open up the curtains so as to allow natural light come into the house and warm it up.
Eating hot and spicy foods will warm your body up, in addition to giving you the needed energy.