Rental apartment heating options

[Minna Hu]

Hi

We have a 8-unit building and it uses centralized gas heating, in winter season, we're paying around $800 each month in gas cost, in non-winter season it's about $300 in gas. We want to replace our current gas heating and reduce the gas cost. 

There are 3 units sharing the same electricity meter. The other 5 units have separate electricity meter. We want to separate the electricity meter for the 3 units, also separate the heating for each unit as well. 

I checked online, seems cost of heating by electricity (for example, baseboard heating) is 4 times of heating by gas, is that true? What heating options do you suggest? Thank you!