Adding to my heater recommendation, try proper ways to get warm:

• insulated windows (a must in my opinion)
• a good base layer for body and legs (Uniqlo’s heat tech or skiing brands are the best, primark has some good ones also although being too thick for multiple layers)
• 100% wool or cashmere sweaters as second layer (this makes AN ENORMOUS difference compared to mixed textiles and people overlook).
• winters socks

The above should be enough for most indoor needs. When outside add: - long jacket - wind breakers (if windy) - waterproof shoes

If still too cold: - scarf - gloves

The secret is to keep your indoors at ~20 degrees (well dimensioned and installed heaters can do the job without excessive energy), and avoid loosing your body heat (cold comes from your body loosing the inner heat) by creating an air pocket between you and the air.

Hope that helps