Cloud computing is growing in popularity and it has been continuously updated with more improvements. Auto scaling is one of such improvements that help to maintain the availability of customer’s subscribed cloud system. The appearance of an auto scaling mechanism in the cloud system with many existing system mechanisms is an issue that needs to be considered. Because, normally, there is no free drawbacks whenever a new part is added to a certain stable system. In this paper, we consider how existing load balancing and auto scaling impact on each other. For the purpose, we have modeled a cloud system with an auto scaler and a load balancer and implementing simulations based on the constructed model. Also based on the results from the computer simulations we proposed about choosing load balancers for subscribed cloud system with auto scaling service.