high utility costs for tenants, non compliance, not sure what to do.

[Brandon Morgan]

hi all i am a new landlord and got my first rental property. tenants moved in in September and October. the first month was fine but when December hit it got extremely cold and the heating is electric. due to poor insulation in the home that we did not know about the heat has to be turned very high up to keep the home warm, however since everything is electric it is causing the electric bill to be $800. the utilities are the tenants responsibility. however because of this one of the tenants has been extremely non compliant with paying rent. I am doing my best to accommodate and fix the insulation as well as see if there are programs in place to lower the cost. however i want to be firm with tenant as they are not compliant with paying rent because of the cost of the utilities. I am not really sure what to do in this scenario. has anyone had any similar experience?