Sizing a Whole-Home Generator Before Wyoming Winter Storm Season

Across Central Wyoming, homeowners run the same numbers each November. When a January blizzard kills power for three straight days, a standby generator quits feeling optional and starts looking like money well spent. This is how you size it correctly.

Essentials vs Whole Home

10–14kW covers the essentials: refrigerator, lights, outlets, internet, and one stage of HVAC or a window unit. 18–22kW runs most whole Casper homes including central air — the difference between riding out an outage and evacuating to a hotel. 24kW+ covers large homes and dual HVAC systems.

Size From Loads, Not Square Footage

A thorough load calculation tracks what actually pulls current — HVAC tonnage, water heater, range, well pump, medical equipment. Two Casper homes built to 2,000 square feet can require completely different generators. Guessing by footprint either leaves you stranded or sinks thousands into capacity that never fires up.

What Installed Costs Look Like

Turnkey — unit, automatic transfer switch, pad, fuel connection, permits, startup — most Casper-area installs run $8,000–$15,000. The transfer switch is the brains: it senses the outage, starts the generator, and switches your home over in seconds, whether you're home or not.

The Timing Argument

Once a major blizzard rolls through Wyoming, generator crews book out for months and equipment lead times stretch. Jobs scheduled February through May get more crew attention, faster permits, and — the main thing — power security before the deep freeze returns. If you rely on a portable generator, have a transfer switch and inlet box added ($900–$1,800). That kills the extension-cord tangle through windows and removes the carbon-monoxide gamble of running it too close to the house.