What Size Generator Does My Gulf Coast Home Actually Need?
Generator size comes down to one decision: whole-home coverage or essentials-only. How kilowatt ratings map to real Gulf Coast homes, why air conditioning drives the number, and how to right-size without overpaying.
Generator sizing is really one decision: do you want the whole house to run normally during an outage, or just the essentials? For most Gulf Coast single-family homes, essentials-plus-one-AC lands around 14–20 kW, and true whole-home coverage typically runs 22–26 kW or more — because here, unlike milder regions, the outage you're planning for is a week of August heat, and air conditioning is the load that decides everything. The honest path to the right number is a load calculation on your actual equipment, not a chart on the internet — including this one.
Why does air conditioning dominate generator sizing here?
A refrigerator, some lights, and a modem barely register — a few hundred watts. A central AC is measured in thousands, and it spikes further for a moment each time the compressor starts (inrush current). A generator that can't absorb that start-up surge stalls or trips even though the “running” math looked fine. This is why Gulf Coast sizing conversations start at the condenser's nameplate, and why soft-start kits — which shave the inrush spike — sometimes let a smaller, cheaper generator carry an AC it otherwise couldn't.
The regional stakes are real: post-hurricane outages here mean days of 95° heat and tropical humidity. A generator that runs everything except the AC keeps your food cold while your family sleeps somewhere else.
What do the common size tiers actually cover?
- Portable, 7–12 kW: refrigerator, lights, fans, electronics, maybe a window unit — manual setup, manual refueling, and strict carbon-monoxide discipline. A stopgap, not a plan.
- Standby, 14–20 kW: the Gulf Coast sweet spot — essentials plus one central AC (often with a soft-start), automatic transfer, runs on natural gas or propane.
- Standby, 22–26 kW+: whole-home: both AC systems in a two-system house, electric cooking, water heating, the works. The premium buys not thinking about load management at all.
Between tiers, a load-management module is the useful middle path: it sheds lower-priority circuits (dryer, oven) automatically when the AC starts, letting a mid-size unit act bigger than it is.
Natural gas or propane — and what about fuel during a storm?
Most standby installs in Dickinson, League City, and Friendswood run on natural gas: no tank, no refueling, and gas service has historically stayed up through most local storm events. Propane serves homes without gas service and stores energy on-site (a 250–500 gallon tank runs days to weeks), at the cost of tank logistics. Portables burn gasoline — which is exactly what disappears from every station within fifty miles when a hurricane enters the Gulf. That fuel reality, more than convenience, is why standby units dominate serious outage planning here.
How do I get from a guess to a real number?
A proper sizing visit inventories your panel and the loads that matter to you, checks the AC's locked-rotor amps, evaluates gas line capacity (an underfed generator starves at full load — a detail internet calculators skip), and picks placement clear of flood-prone spots and bedroom windows. It ends with tiered options and real prices, not a single take-it-or-leave-it number. Read what the install itself involves in our installation walkthrough, and see the broader storm plan in outage preparedness.
Quick answers
Is a bigger generator always the safer choice?
No — a chronically underloaded generator wet-stacks and wears poorly, and you pay more up front and in fuel. Right-sized with load management usually beats oversized.
How fast does a standby generator take over in an outage?
The automatic transfer switch detects the outage and starts the unit — power is typically back in well under a minute, with no one home needed.
Can a generator run my EV charger too?
It can be sized to, but most households prioritize cooling and refrigeration during an outage. It's a priorities conversation during the load calculation.
A real load calculation on your actual equipment — tiered options and straight prices, before hurricane season fills the calendar.
Ready for a better day?
One call handles it all — HVAC, electrical, and generators across the Texas Gulf Coast. Less to pay. Better day. That's the Mackey way.
Mon–Fri: 7 AM – 8 PM · Sat: 8 AM – 5 PM · Licensed & insured · #TACLA 112769C · #TECL 558211