Hi, just wondered if anyone knows what kind of gas powered generator would be required to run the above central air conditioner/heater if the electric was to go out? I also will need to run a refridgerator/freezer and fans and coffee pot, microwave (700 Watt), a TV and cable box, modem and router, 2 computers and a few lights. Would a 7,000 watt generator be efficient or will I need 10,000 watt or higher? Please reply. Thank you.