Your husband is, knowledge aforethought, abusing you. He is controlling and bullying you and you need to do something about it now. It will be hard because if you ignore him laughing at you he will take it to the next level.
You need to inform others of your intentions so he cannot isloate you and bully you futher. Start with outside agencies like your doctor and get an assessment which shows you need to keep warm. If he listens to his brother and family tell them and enlist their support. If they won't help then up the ante and try medical help, social services and, finally, law and police.
If the man is appropriating money meant for you to be warm he is breaching all kinds of social and legal rules. If this behaviour has escalated over thiry years he will be fairly confident he can scare you into submission so you cannot overturn this without outside help.
Have a plan. Execute it stage by stage. Remain calm, insistent, reasonable and do not give way.
I have the heat off in the winter to save money as my husband is out working to earn money for us. However, that is entirely my own choice. My man is a bit of a controller too but I let him know when he is doing it, I argue and negotiate and I have let him know that if he tries to bully me I will leave him. Men like to have their own way but too much appeasement is very bad for them.