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Regarding Carlson's question, we purchased a standby generator after Ike left us without grid power for 17 days. It is a Generac liquid cooled 23KW (propane)/20KW (Natural Gas) unit with an auto transfer switch. This essentially replaces our 100 Amp service entirely so all circuits stay on. It carries the A/C, the well, and everything else we have going just fine in the heat of summer. The liquid cooled unit is MUCH more expensive than the air-cooled units, and much quieter since they run at 1800 RPM instead of 3600 RPM. Turn-key, installed on a pad, with a short run of gas line from where it enters our home, the auto transfer switch and a whole house surge protector, the prices was within a few dollars of $15,000. It has proven to be money well spent on multiple occasions.