Bias disclosed up front
Cummins vs Generac
We sell Cummins. You should read this knowing that. What follows is a comparison we can defend on the specifications and the market facts, including the places where Generac is genuinely the better answer — because a comparison that finds no fault with the writer's own product is not a comparison, it is an advertisement.
Where Generac genuinely wins
Dealer density. Generac has far more dealers, in far more places, than Cummins does. If you live somewhere rural, the practical question of who can be at your house in 48 hours during a regional outage may favour Generac purely on coverage. That is a real advantage and it is not close.
Product breadth at the low end. Generac fields more variants in the small residential sizes, including models below what Cummins offers. If your budget or your load genuinely lands under 13kW, Generac has options we do not.
Brand recognition. Generac is the default name in home standby. That matters for resale conversations with buyers who have heard of one brand and not the other.
Where Cummins wins
The engine business behind it. Cummins is an engine and power-generation company whose primary business is industrial and commercial power — the same company builds standby power for hospitals and data centers. The residential line inherits that engineering lineage and that parts and service infrastructure.
Commercial continuity. If you may eventually need light commercial or three-phase power, Cummins runs continuously from a 13kW residential air-cooled unit up through 200kW diesel on one dealer relationship, one parts channel and one service organization.
Transparent, disciplined pricing. Cummins holds its advertised pricing consistent across the channel, which is why we can publish our prices on this site to the cent and invite you to compare. Price shopping between authorized Cummins dealers is a short exercise.
What does not actually differentiate them
Both brands build competent air-cooled residential units in the 13kW to 24kW range on similar architectures. Both use aluminum enclosures, both offer service-entrance rated transfer switches, both support load management, and both have mobile monitoring. Anyone telling you one of these is categorically superior at the same output and price point is selling, not analyzing.
The failure modes that actually strand homeowners are almost never brand-level. They are a generator sized too small for the air conditioning, a gas line that was never upsized, a transfer switch specified to the generator instead of the service, or maintenance that never happened. All four are installation and service problems, not badge problems.
The honest decision rule
At residential sizes, choose the installer before you choose the brand. The equipment is more similar than the marketing suggests, and the install quality varies enormously.
Ask any dealer, us included: are your crews employees or subcontractors? Who pulls the permit? What is your response time in year three, after the sale? Will you put the installation price in writing before I pay anything? Those answers will predict your experience far better than the name on the enclosure.
We deliberately do not publish claims about competitor recalls, litigation or field failure rates. Those get repeated carelessly across the industry, they are frequently out of date, and we would rather win on what we can document.
Questions
Is Cummins more expensive than Generac?
It depends entirely on the model pair you compare, and on whether the transfer switch is in the box. Our combo units include a 200A service-entrance rated switch, which is the comparison most price charts get wrong by omitting. Every one of our prices is published, so you can do the arithmetic yourself rather than take our word for it.
Can you service a Generac I already own?
We are a licensed electrical contractor and can perform electrical work on an existing installation, but warranty service on a Generac has to go through a Generac dealer. If you have an out-of-warranty unit and need electrical work around it, call us and we will tell you honestly whether we are the right people.
Does the brand affect my home insurance or resale value?
In our experience neither insurer nor appraiser distinguishes between major standby brands. What they care about is that the installation was permitted and inspected. An unpermitted generator is the thing that causes problems at closing, regardless of who made it.
Get a real number for your property
Equipment pricing is published on every model. The installation number takes about 45 minutes at your address, and it costs nothing.