Your energy bill could blow up during Winter as you need your heater running most of the time.

Seal the plastic by going over it with the heat setting of your blow dryer.

#2 Seal Gaps with Spray Foam

Seal around electrical outlets on exterior walls with spray foam.

10 DIY Ways to Warm Your Home in Winter

Image credits: MrFixItDIY via Youtube

This will also help you lower your energy bill.

So verify to check weatherstripping regularly or install if you dont have one.

10 DIY Ways to Warm Your Home in Winter

Installing plastic window insulation

Replacing traditional fireplace with a modern one

10 DIY Ways to Warm Your Home in Winter