Generac 18kW review
Generac 18kW Whole Home Standby Generator with 200-Amp Transfer Switch (7324)
By Tom Calder
Eighteen kilowatts and a 200-amp transfer switch. That's exactly DTE Energy's 18,000-watt starting figure for a 3-ton central air conditioner, which leaves no headroom for anything else running when it starts, and less still if its rating on your fuel is lower. So treat it as a big essentials-plus unit rather than counting on it to start central air.
- Best for
- A bigger home without central air, or with a small AC unit
- Skip it if
- You want central air without fuss
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- 200-amp transfer switch included
- Plenty for the essentials plus a water heater or well pump
- Starts by itself on propane or natural gas
Worth knowing
- No headroom to start a 3-ton central AC alongside other loads
- 426 lb
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Who shouldn't buy this
Don't buy it if you want central air without fuss: the 22 kW has room to spare.
Key specs
| Rated output (listing) | 18,000 W |
| Transfer switch | 200 amp, included |
| Fuel | Propane (LP) or natural gas |
| Weight | 426 lb |
| Warranty | 5-year limited |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for 22 kW standby with Wi-Fi monitoring
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for Whole-house standby, 10-year warranty
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for A large home that wants a second brand besides Generac at the 26 kW size