Investors & landlords

I am in a similar situation but 90% of my yearly utility bills occur in the few months when renters are there during the summer months.  Simply splitting the expense across personal/rented doesn't seem right.   Is there a way to itemize utility expenses for rented days vs personal?    One example is the electric bill which can be as high as $600 in the hot summer months.(rental time)   In the months we visit it is about $150/month.   

 

Thanks.