Furnace for a home

I'm raising money to be able to install new furnace heat pump for my family, this old furnace causes our electric bill about $850 a month we can't afford this, plus it's weak the heating and cooling company says it's best to replace it and it's to old to be fixed and the reason why electric is so high is because there is no heat pump. It's very cold and I'm tired of my mother hiding in her room and my fur babies shaking so please help us thanks.