Need advice on separating utilities for a new rental property

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I just purchased a two unit rental and have been told by other landlords that it’s best to have all the utilities separate so each tenant pays their own, which I agree with. The way this property is set up is there is one gas furnace and one unit has a thermostat so they would control the heat for both units. Not only do I think that’s unsuitable for obvious reasons I also don’t like that I will have to pay for the heat and increase the rent amount to cover that. The other option I have is to install mini splits throughout the property and go fully electric. It solves the first problem but will cost me more upfront when I’m already putting a significant amount into rehabbing this property. Anyone have some wise words on this to help me make the best decision??