Average Energy costs for STR in Phoenix area

[Kornelius Friske]

We have a STR located in peoria AZ. it's 6 beds (garage conversion) and about 3900 sq ft in total. our energy bill last month was $450 and has been hovering in the $350-$450 range since we went live in august. We do have a pool but the heater hasn't been on until last month.

Is this normal cost or high? It seems incredibly high but we aren't familiar with the phoenix area. Also we've averaged about 10-15 nights of occupancy over the last few months. 

any input appreciated. 

Thanks,