Home Generator Cost Research

A whole-home standby generator costs $7,000–$25,000 installed, with most homeowners paying $10,000–$16,000 for a 20–22 kW natural gas unit. The generator itself costs $2,000–$15,000 depending on brand and capacity, while professional installation adds $3,500–$8,000 covering the transfer switch, electrical work, gas line, concrete pad, and permits.

Generac holds approximately 70% of the US residential standby generator market and offers the best value for most homeowners, with lower prices and the widest dealer/service network. Kohler generators operate 3–5 dB quieter (62–67 dB vs. 66–72 dB), carry a standard 5-year residential warranty, and use commercial-grade engines. For most homeowners, Generac delivers the best cost-to-value ratio; for those prioritizing quiet operation and maximum durability, Kohler justifies its premium.

The average US household experiences approximately 1.3 power outages per year, with an average duration of 3.5 hours. However, outage frequency and severity vary dramatically by region — households in the Southeast and Gulf Coast experience 2–4 outages annually, while those in the Northeast face increasing outage risk from nor'easters and ice storms. Major weather events account for 58% of all outage hours.

Natural gas is the preferred fuel for most homeowners with existing gas service — it offers unlimited runtime (connected to the utility line), lower fuel cost ($0.80–$1.20/hour to operate), and no storage requirements. Propane is the better choice for rural homes without natural gas service, offering similar performance but requiring a 250–1,000 gallon tank ($800–$2,500 installed) and periodic refilling. Dual-fuel generators ($500–$1,000 premium) provide the flexibility to run on either fuel.

For whole-home backup, a 20–22 kW generator covers most 2,000–3,000 sq ft homes with central AC, electric range, and standard appliances. A 10–14 kW generator handles essential circuits only (lights, refrigerator, sump pump, one AC zone). Large homes over 3,500 sq ft or homes with electric heat, pool equipment, or EV charging typically need 24–48 kW. The most accurate sizing method is a load calculation performed by a licensed electrician.

Yes — homes with whole-home standby generators sell for 3–5% more than comparable homes without them in outage-prone regions, according to Remodeling Magazine's Cost vs. Value Report. On a $400,000 home, that represents $12,000–$20,000 in added value against a $10,000–$16,000 installation cost. Additionally, some homeowners insurance providers offer 1–5% premium discounts for homes with backup power systems.