My husband and I bicker about stupid things

I have a fear of house fires and do everything in my power to avoid them and prevent them. My husband loves to warm the house with space heaters rather then turn on the heat to save money which I am all for but they terrify me and I feel like they just aren’t safe.

He has one to heat the room. We also use a kerosene oil heater which also freaks me the freak out. It really does warm the house but like I’m just nervous about fires. Any advice with this? What do you use?