as someone who lived through several hard winters in an old farmhouse heated only by a wood-burning stove in upstate NY here are my best tips for keeping warm: 1) layer as much as you can.

If you have leggings wear them under your jeans/sweatpants. If you have tights/stockings wear them under your leggings and then put on heavier pants over that and your heaviest socks. If you have a heavy sweatshirt or sweater wear a long sleeve t-shirt or a t-shirt under it.

If you have legs that would fit a cis guy in your life really encourage them to wear a pair under their jeans as well. Layer up as much as you can. Always wear socks and if you can wear two pairs of socks do that. If you have slippers wear them if you don't consider wearing shoes

If you are sitting reading/writing/working on the computer keep your feet off the floor. Cross your legs, put your feet up on the couch, get into bed, and work from there. Put a blanket over your feet and legs.

If you still have electricity drink a lot of hot beverages tea/cocoa/coffee. The cup will keep your hands warm, which is particularly important if you are writing at a computer, and the hot drink will help keep the rest of you warm too.

Roll towels/blankets/or cloths up into snakes and stuff them along the windowsill of all your windows. Roll up blankets (if you have them to spare) and stuff them along the bottoms of the doors too.

If you have really drafty windows stuff clothes or blankets between the screen and the glass then roll up towels and put them on the windowsills. Consider nailing or thumbtacking blankets or sheets over your windows all together particularly in the bedroom.

If you have a window airconditioning unit that can't be removed stuff towels or dishcloths all around it and drape a blanket over it.

If you have a sleeping bag, considering sleeping in it with a blanket over top. Sleeping bags are usually insulated and rated for extremely cold temperatures. Even if you don't/can't sleep in a zipped-up sleeping bag, unzip it and use it as an insulated blanket on your bed.

At night layer every blanket you have on the bed, including sleeping bags, throw blankets, anything. Let your pets sleep with you in bed if possible. It will help keep everyone warm.

Also, use a sweatshirt/bathrobe/even coat as your topmost layer, and then when you wake up in the morning put it on before you get out of bed to better conserve body heat. Always sleep in socks when it is really cold out.

The more people in a space the warmer it will be. If there are multiple people in your household and you are struggling to heat your entire space plan out where folks will be. If everyone can spend the day in the living room that room will stay warmer just from combined body heat

Figure out where in your space is less important to heat and close those off. If you have doors between heated and unheated parts of your space close them. If you don't consider handing sheets/blankets/tapestries between the heated and unheated sections of the house.

DO NOT HEAT YOUR HOUSE WITH YOUR STOVE! that being said the kitchen will probably be one of the warmest rooms in the house while you are cooking. Get everyone in there. Get cups of tea, put on music, make people help with the cooking.

Eat food that is hot and high calory. Your body needs the energy to keep you warm. Hot and hearty is the name of the game; casseroles, and soups.

Eat it as soon as it comes out of the oven. In a really cold house, a casserole will go from boiling hot to stone cold in the time it takes for you to get everyone drinks and silverware on the table. Make sure everyone is there and ready to eat the minute it comes out of the oven

wrapping your dish of food in a towel and putting something over the top (lit, plate, or small pan) will help keep it warm while you're eating your first helping. If you still have soup in the pot keep it on a keep-warm burner or a very low heat but keep an eye on it.

I have put extra rolls or bread back in an off but still warm oven so they didn't go cold while we were eating. This is a good time to eat in your kitchen and not the dining room if you can that way you can stay in the warm kitchen and keep an eye on anything still on the stove

I don't really want to recommend buying anything because that comes with its own issues but I will say hot water bottles are really really worth it. They are good to have on your lap during the day and to put on the blankets for extra warmth at night https://www.amazon.com/Attmu-Classic-Rubber-Transparent-Bottle/dp/B00Q2A85K4/ref=sr_1_1_sspa?dchild=1&keywords=hot+water+bottles&qid=1613489517&sr=8-1-spons&psc=1&smid=A2UV2VXDDFSPSW&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExRDVUWDNRS1MzSE1MJmVuY3J5cHRlZElkPUEwMzUyNTI0MzRMOTE4TlkwRzU5RSZlbmNyeXB0ZWRBZElkPUEwMTM5MjIwM0w2TUZHN1dUS0VVTiZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=