Another advantage of our Home Generator Systems is that they run on liquid petroleum or natural gas, so they don't need to be refueled as often, if at all. Additionally, rest periods to allow cooling are not necessary. All Briggs & Stratton Home Generator Systems are air-cooled and do not require you to turn them off after extended run times. However, you will need to turn off the unit before refueling (if running on LP gas) or when checking the oil levels which should be done on a regular basis during and after extended use (refer to your owner's guide for instructions).