I used to use a regular room space heater in my tent but moved to this small but mighty version that is also a non-heat cooling fan & will never go back. I'm always looking for maximum performance at the smallest space impact for gear.
https://www.amazon.com/PELONIS-Fan-...space+heater&qid=1555032930&s=gateway&sr=8-36
Sorry about the pricing. I think there's an error when it's closer to $15 than $150.
I have a very large tent that holds 2 queen air mattresses with standing/gear room in between and this one heater is plenty. It also serves as just a fan for those seasons where you need cooled in the day and heated at night.
Instead of an electric blanket, I use this
https://www.walmart.com/ip/Sunbeam-Cozy-Toes-Heated-Footwarmer/48931286
much smaller to pack and so versatile. I can lay it across under our feet if two of us sharing a bed, I can turn it lengthwise between 2 of us or I can turn it lengthwise for one person in their own bed. I also think it helps to heat from the bottom up, when the ground is cold.
I also can get a lot of bang for my buck (i.e. packing space) to take gloves, hats and thin but multiple clothing layers for warmth. I know this maybe sounds like overkill but I've literally been camping and had to scrape ice from my car window in the morning.