Please call your utility company before you make a repair request. Many electrical outages are due to temporary problems caused by billing issues, weather, and construction. Your electrical company can help you pinpoint what's causing the problem.
If you don't have hot water in your rental home and your property has its own water heater, locate the tank and check the settings. Does everything look correct? If your heater is gas-powered, verify that the pilot light is lit.
If you do make any changes to the system, wait 15 to 20 minutes before testing the water again.
If your HVAC system isn't working normally, use the central thermostat in your property to troubleshoot the issue. Turn the system off and back on to see if that resolves the problem. You should also verify that temperature controls are set correctly.