They can at least offer to cover some of the electric bill. They're the homeowner and their tenant doesn't have adequate heat. It's the landlord's responsibility to fix it and if contractors can't come out, then they have to do what they have to do. Put them up in a hotel/motel until the property is liveable, provide heated blankets or space heaters, put them in a vacant unit with an air mattress...

The tenant is literally paying the landlord to be responsible for moments exactly like this.