Most Dallas homeowners shopping for backup power start with one question: how big? It feels like the whole decision. Bigger unit, more coverage, done.

The better question is how smart. If you are asking what size generator you need for a Dallas home, the answer may be smaller than you expect. A load management system can run a large home on a smaller generator, and it changes the entire calculation. You may not need the biggest unit on the lot to keep your house running.

We will show you the sizing formula, and why your central air conditioner drives most of the number. Then we will explain how load management shrinks the generator you actually need, how whole-home and essential-circuit coverage compare, and what a Dallas installation really involves.

Most Dallas homes need a standby generator between about 18 kW and 26 kW to run central air and essential systems. But the number depends on how you manage load, not just the size of your home:

• Add the running watts of everything you want on at once
• Add the single highest starting surge, usually your air conditioner
• Add roughly 20% for headroom

That total is your minimum without load management. With a load management system, the generator briefly sheds non-critical circuits when a big load starts. That lets a smaller unit cover a larger home. It often drops you a size or two.

So the honest answer is a range, not a number. The right size depends on your home and how you choose to manage its power.

Generator size is measured in kilowatts, or kW. One kilowatt equals 1,000 watts. That number tells you how much power the unit can produce at once.

Finding your number takes three steps.

Add up your running watts — List everything you want powered during an outage. Total the running watts of all of it.

Add your largest surge — Find the one appliance with the highest starting watts. Add that single number to your running total.

Add headroom — Put roughly 20% on top, so the unit is not running at its limit.

You add only the highest surge, not every surge. Your appliances do not all start in the same instant.

That result is your minimum. Go smaller, and the generator trips when demand climbs. Go much larger, and you pay for power you never use.

Keep one thing in mind as you read on. This number is your size before load management. The next two sections change it.

That formula gives you a number. In Dallas, one appliance decides most of it.

Your central air conditioner is the largest electrical load in most homes. It draws roughly 3,000 to 5,000 watts while running. When the compressor starts, that surge jumps to somewhere between 7,000 and 9,000 watts.

That startup surge is the number that sizes your generator. Not the running draw. The spike.

In Dallas, this matters more than almost anywhere. Summer heat makes air conditioning non-negotiable. A generator that cannot start your A/C is not backup power. It is a very expensive set of lights.

Larger Dallas homes often run a 5-ton system. The bigger the unit, the bigger the surge, and the more generator you need to cover it. Some homes run two systems, which raises the demand again.

This single surge is why so many homeowners overbuy. They size for the peak moment when the A/C kicks on. The next section shows how to handle that moment without buying the biggest unit on the lot.

That is your size if you plan for the peak. Here is how to plan for less.

A load management system watches the big loads in your home. When one large appliance starts, it briefly holds back another. The generator never sees both surges at the same moment.

Think about a home with two air conditioners. Without load management, your generator has to cover both starting at once. That is a huge surge, and it forces a large unit.

With load management, the second A/C waits a beat while the first one starts. Then it follows. The generator only ever handles one big surge at a time. So it can be smaller.

The same logic covers an EV charger, an electric range, or a pool heater. The system staggers them, automatically, in fractions of a second. You will not notice it happening.

This is not an exotic add-on. A load management controller is standard equipment on many modern standby systems.

The result is simple. Without load management, you size for the peak. With it, you size for the managed load. That difference can drop you a generator size or two, and lower what you pay.

Load management changes the size. It also changes an older decision: whole-home or just the essentials.

Essential-circuit coverage:

• Powers a chosen set of circuits
• Smaller generator, smaller install
• You decide what makes the list
• Some things stay dark

Whole-home coverage:

• Every circuit stays live
• Larger generator, unless load management bridges the gap
• Nothing to think about during an outage
• Your home runs as it always does

Some homes clearly need whole-home power. If someone depends on medical equipment, works from home, or is always there during the day, full coverage is the safer call.

Here is where load management matters. It blurs the old either/or. You can get close to whole-home coverage without buying the largest unit made. The system juggles your big loads, so a mid-size generator does the work of a bigger one.

To choose, ask three questions. How long could a Dallas outage last? Who is home when the power drops? And what will you not go without?

Coverage is one decision. The install itself is the part most homeowners underestimate.

A standby generator is not just an electrical job. It is two trades at once.

Electrical work — A licensed electrician wires the generator and transfer switch into your main panel. This is master-level work on the highest-voltage equipment in your home.

Gas work — A licensed plumber taps your natural gas meter and runs the line to the unit. Most Dallas homes already have gas at the house, which makes this straightforward.

That is why a single turnkey provider matters. Splitting the job between a separate electrician and plumber leaves you coordinating two schedules and two crews. One team handling both is cleaner and faster.

The physical install adds more steps:

• A concrete pad for the generator to sit on
• Underground conduit for the electrical run
• The automatic transfer switch
• A load management module, where it fits your system

Placement follows rules. The unit needs clearance from windows and doors. Many Dallas neighborhoods also carry HOA setback requirements. We check both before we place anything.

Every install needs a permit and a final inspection. The City of Dallas Building Inspection department handles permitting for generator installations — we manage that paperwork start to finish.

Bringing 50 years of Berkeys expertise to Dallas.

Stop guessing at watts. Our licensed electricians will read your panel, measure your load, check your load management fit, and give you a firm number.

Learn more about our Dallas team and the electrical, plumbing, and A/C services we bring to Dallas, the Park Cities, East Dallas, Lakewood, and the White Rock Lake area.

Call (214) 612-0133 to schedule your free generator sizing consultation.

Business Address: 4311 Belmont Ave Suite 125, Dallas, TX 75204
Customer service available 24/7.