Calculators · United States
Independent guide to home backup power with sizing calculator, cost data, and brand comparisons
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Free calculator and guides for choosing the right whole house generator, including sizing, costs, fuel types, and brand comparisons for US homeowners.
Generator for House is an independent research site about home backup generators that helps US homeowners choose the right generator through three key decisions: load size, fuel type, and installed cost.
The site provides a free calculator that adds up appliances to determine running watts and starting surge needed, avoiding brand marketing in favor of published manufacturer specifications and real cost data. It covers standby whole house generators and portable options from major brands including Generac, Kohler, Champion, and Briggs & Stratton.
The site earns money through affiliate commissions that do not influence recommendations, accepts no brand sponsorships, and publishes all data sources including appliance wattage charts from Champion Power Equipment and outage statistics from the US Energy Information Administration.
Pricing model: Free
Add up the running watts of everything you want to keep on during an outage, add the starting surge of your largest motor appliance, then add a 20% safety margin. Most gas-heated 2,000-2,500 sq ft homes need a generator between 7,500 and 22,000 watts.
A standby whole house generator costs $6,000 to $14,000 installed for most homes, with roughly half the cost in equipment and half in transfer switch, electrical work, and gas connection. A portable generator plus transfer switch covers essentials for $2,000-$3,500.
The Generac Guardian 22kW is the most-installed whole house generator in the US and fits most medium-large homes. Smaller gas-heated homes are often better served by the Generac PowerPact 7.5kW or a large portable like the Champion or Westinghouse 7,500W dual-fuel class.
A 7,500-13,000 watt portable generator connected through a transfer switch runs the practical loads of most gas-heated homes: furnace, fridge, well pump, lights, and a window AC. Central air conditioning and all-electric homes generally need a standby unit.
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