Dexter, MO Standby Generator Installation — Size Guide

Estimated Read Time: 9 minutes

Power outages are part of life around Paducah, Lake Barkley, Sikeston, and Jonesboro. If you’ve been wondering “what size whole house generator do I need,” this guide gives you a clear answer. We break down sizing math, fuel choices, and transfer switches so you get dependable backup power without overspending. Want help fast? Tri-State offers a free on‑site evaluation and a free instant online estimate to size your system correctly the first time.

Why Generator Sizing Matters More Than You Think

Selecting the right size whole house generator is about more than keeping lights on. It protects critical systems like heat, well pumps, sump pumps, refrigerators, medical devices, and home offices. Undersize your unit and you risk nuisance trips, brownouts, and shortened equipment life. Oversize it and you pay more upfront, more in fuel, and more for maintenance than you need.

Two hard facts to anchor your decision:

1. Automatic transfer switches can detect an outage, start your generator, and then shut it down when utility power returns. That means seamless transitions with no manual steps.
2. KOHLER systems can restore major appliances in about 10 seconds, and many units run on natural gas or liquid propane. That quick response and steady fuel supply are ideal during storms and long utility interruptions.

In our region, ice and wind often knock out service across Western Kentucky and Southeast Missouri. Proper sizing avoids the dangerous cycle of overloaded circuits during cold snaps or heat waves.

Step 1: Decide What You Must Power During an Outage

Start with a needs list. What should run no matter what? Then add nice‑to‑haves that can wait.

Must‑have loads often include:

• Furnace or heat pump air handler
• Sump pump and well pump
• Refrigerator and freezer
• Essential lighting and outlets for phone and medical devices
• Wi‑Fi/router and home office gear

Nice‑to‑have loads can include:

• Electric oven, clothes dryer, and non‑essential receptacles
• Hot tub or pool equipment
• Garage door openers and outdoor lighting

If you live near rivers or lakes, like around Lake Barkley or the Ohio River, give priority to sump pumps and HVAC. Flooding and humidity spikes can cause expensive damage fast.

Step 2: Gather Load Data the Right Way

You can build an accurate load profile in a single afternoon.

1. Look for the data label on each appliance. Record watts or amps and voltage.
2. Convert amps to watts using the simple formula: watts = amps × volts.
3. Separate running watts from starting (surge) watts for motors and compressors.
4. Note 240‑volt loads like electric ranges, water heaters, and large well pumps.
5. Add a 20 percent safety margin to handle brief spikes and keep the generator from running at max output all the time.

Pro tip for HVAC: Air conditioners and heat pumps have high starting loads. If you plan to run central air, account for both the condenser and the air handler. Variable‑speed systems start softer, which helps sizing.

Step 3: Understand Running vs Starting Watts

Running watts are what a device needs while operating. Starting watts are the brief surge when motors kick on. Refrigerators, sump pumps, HVAC compressors, and well pumps have notable surges that can be 2 to 6 times the running load.

Because multiple devices may start at once, the generator must handle the highest plausible combined surge. Smart load‑management modules can stage starts to reduce the surge requirement, which can allow a smaller generator to serve the same home.

Step 4: Natural Gas vs Propane vs Diesel

Most residential standby systems use natural gas or liquid propane. Both are clean and reliable.

• Natural gas: Continuous fuel supply with no refilling. Ideal if your neighborhood has gas service. Less on‑site storage and strong convenience in multi‑day outages.
• Liquid propane: Great for rural homes without gas service. Tank sizing matters. Many homeowners choose 250 to 500 gallons to ride out extended outages.
• Diesel: Rare in homes due to storage and odor, but strong torque. Typically used for light commercial or agricultural sites.

KOHLER standby generators operate on natural gas or liquid propane and connect directly to your home’s existing fuel supply. This removes the refueling risk that trips up many portable systems during regional outages.

Step 5: Match Real‑World Homes to Typical kW Sizes

Every home is unique, but these ballpark ranges help you shortlist a size before a professional site evaluation.

• 12 kW to 14 kW: Essential circuits in small to mid‑size homes. Runs lights, fridge, gas furnace blower, sump pump, Wi‑Fi, and a few outlets. Add central air only with careful load management.
• 18 kW to 22 kW: Most common for whole‑home coverage in typical 1,800 to 3,000 sq ft homes. Can run one central AC unit, kitchen, and laundry with staged starts.
• 24 kW to 26 kW: Larger homes or those with multiple HVAC systems, well pumps, and heavier kitchen loads.
• 30 kW to 80 kW: Estates, multi‑HVAC zones, or light commercial properties needing everything on without compromise.

Tri‑State installs Generac and KOHLER standby generators across this range, including 12 kW, 14 kW, 20 kW, 22 kW, 26 kW, and up to 80 kW for special applications.

Step 6: The Role of Automatic Transfer Switches and Load Management

Your automatic transfer switch (ATS) is the brains of the system. It senses utility failure, starts the generator, transfers the home to generator power, and reverses when utility power returns. That means no manual start‑up trips in bad weather.

Add smart load‑management modules to:

• Prioritize critical circuits
• Prevent heavy appliances from starting at the same time
• Enable a lower kW generator to serve a larger home without flicker or nuisance trips

With the right ATS and modules, families in Elizabethtown, Poplar Bluff, or Murray can keep daily life steady even during rolling blackouts.

Step 7: Fuel Storage and Run Time Planning

Plan run time before you buy.

• Natural gas: Your utility capacity and meter size matter. Many standard meters support 200,000 to 400,000 BTU per hour. Your installer will verify.
• Propane: Estimate total BTU load from your generator spec sheet, then size the tank for at least 48 to 72 hours of typical runtime without a delivery. In ice storms, roads can be blocked.

A well‑sized fuel plan prevents the harshest surprise of all: running out of fuel during a storm.

Step 8: Noise, Placement, and Local Codes

Whole house generators today use commercial‑grade engines and sound attenuation for quiet operation. Still, placement matters.

• Follow clearance rules for windows, doors, and vents.
• Place on a level pad with proper drainage.
• Consider neighbor lines and bedrooms for sound comfort.
• Meet local code and HOA requirements.

Tri‑State handles permitting and site layout, then delivers a one‑day turnkey installation in most cases to minimize disruption. Our factory‑trained team commissions and load‑tests the system before we leave.

Step 9: Warranty, Monitoring, and Maintenance

Your investment should last 10 to 15 years or more with routine care.

• Warranties: Generators and workmanship are covered. Review the specific unit’s warranty term.
• Weekly system checks: Many systems perform automatic self‑tests to confirm readiness.
• Remote monitoring: Visual status and always‑on alerts help you spot issues early. Many of our installations include 24/365 remote monitoring for the first year during promotional periods.
• Service plans: Seasonal inspections, oil and filter changes, and firmware updates by certified technicians keep your unit in peak shape.

Tri‑State offers 24/7 emergency generator services and repairs by certified technicians. If a storm strains your system, help is one call away.

Sizing Example: A 2,200 sq ft Home in Western Kentucky

This family wants heat, refrigeration, hot water, cooking, laundry, and one central AC. Their loads look like this:

• Gas furnace with 600‑watt blower
• 3‑ton central AC, 3,500 running watts, 7,000 starting watts
• Refrigerator and freezer, 800 running watts combined, 1,600 starting watts
• Sump pump at 800 running watts, 1,400 starting watts
• Microwave and small kitchen loads at 1,800 watts intermittent
• Lighting and outlets at 1,000 watts

Running total sits near 8,700 watts, but starting surges can push above 12,000 watts if AC and sump pump start together. With load management to stagger starts, a 18 kW to 20 kW generator provides comfortable headroom and quiet operation.

When To Choose Whole‑Home Coverage vs Essential Circuits

Whole‑home coverage replicates normal living and is ideal for remote or storm‑prone properties. Essential circuits cost less and focus power where it matters.

Choose whole‑home coverage if you:

• Work from home or run a home business
• Have medical devices or refrigerated medications
• Use well or sump pumps
• Face frequent or multi‑day outages

Choose essential circuits if you:

• Rarely lose power
• Can pause laundry and cooking during an outage
• Want the lowest upfront cost

Our free site evaluation helps you compare both options.

The Professional Edge: Why Experience Beats Guesswork

Online calculators are helpful, but they do not see your service panel, meter size, gas regulator capacity, ducted HVAC loads, or code constraints. Our specialists walk your home, map circuits, measure clearances, and verify gas supply to size the right unit, not the largest price tag.

Two more facts to consider:

• One‑day turnkey installation is common with our team. That saves you from juggling multiple contractors.
• Our company holds a long‑standing A+ rating with the Better Business Bureau, reflecting consistent service quality and ethical operations.

When storms roll through the Ohio River Valley, you want a generator sized, installed, and maintained by people who do this every day.

Brand Notes: Generac and KOHLER

Tri‑State partners with top manufacturers to match your home and budget.

• KOHLER: PowerBoost technology helps start large appliances without dropping power to others. Units feature rust‑resistant enclosures and commercial‑grade engines that run quietly with minimal maintenance. Fast, automatic response in about 10 seconds.
• Generac: Broad model range, proven reliability, and strong parts availability across the 12 kW to 26 kW classes most homeowners choose.

We help you compare noise ratings, warranty terms, and service intervals to find the best fit.

What Happens After Installation

The job is not finished when the lights come on. We commission the system, verify transfer timing, and confirm your monitoring connection. Then we review maintenance options so your generator is ready when you need it.

• Routine service: Oil, filters, spark plugs, battery, firmware checks
• Annual inspections: Load test, valve lash checks per manufacturer guidance, enclosure and pad condition
• Remote monitoring: Alerts, status checks, and proactive scheduling

With 24/7 emergency service, your coverage does not end at installation.

Quick Checklist: How To Choose Your Size

1. Write a list of must‑run and nice‑to‑have circuits.
2. Collect running and starting watts for each large appliance.
3. Decide on natural gas or propane and verify capacity.
4. Consider an ATS with load management to right‑size the unit.
5. Shortlist a kW range: 12–14, 18–22, 24–26, or 30+ for large homes.
6. Schedule a free on‑site evaluation for a precise recommendation.

Ready to stop guessing and start planning with confidence? We are here to help in Paducah, Murray, Sikeston, Poplar Bluff, Charleston, Saint Charles, Benton, Ozark, Jonesboro, and nearby areas.

Special Offer for Homeowners

• Free Site Evaluation: Get professional sizing and placement guidance at no cost.
• Free Instant Online Estimate: Use our estimator to see pricing for whole‑house generator installation.

Call (877) 301-7693 or visit http://www.tristatewhywait.com/ to schedule. Ask about current seasonal specials on new generators and first‑year remote monitoring and maintenance when available.

What Homeowners Are Saying

"Eddy and Andrew installed a 14KW Generac generator & both were professional, respectful, efficient, pleasant and very knowledgeable. They completed job promptly and answered all of my questions!"
–Eddyville, KY

"Kevin May serviced my standby generator today. Very professional and did an outstanding job. explained everything he did Great service technician. I live near Eddyville Kentucky on Lake Barkley. We just had 3 1/2 days without power generator ran perfectly."
–Eddyville, KY

"One thing I like most about Tri-State was the install process, especially as it relates to the generators. Complete turn-key from generator and propane tank placement, gas lines, and all electrical work. They do it all at once. No need for secondary contractors. And peace of mind."
–Homeowner Review, Western KY

"These folks are great! Had two whole house generators installed and both are flawless. Customer support is top notch. Highly recommend."
–Homeowner Review, Southeast MO

Frequently Asked Questions

How do I estimate what size whole house generator I need?

List must‑run circuits, total their running watts, add starting watts for motors, and include a 20 percent margin. A pro site visit verifies gas capacity and panel details.

Can a 14 kW generator run my central air?

Sometimes. With a smaller AC and smart load management, it may work. Many homes choose 18–22 kW to run central air plus kitchen and laundry comfortably.

Is natural gas or propane better for standby generators?

Natural gas offers continuous supply and fewer refills. Propane fits rural homes. Both are reliable. Your installer will size meters or tanks for multi‑day outages.

How fast will a standby generator restore power?

Quality systems detect outages and restore major appliances in about 10 seconds, then shut down automatically when utility power returns.

How often should my generator be serviced?

Follow the manufacturer schedule. Most homeowners do annual service plus automatic weekly system checks. Remote monitoring helps catch issues early.

Final Takeaway

Choosing the right size whole house generator protects comfort, food, and safety. If you are asking “what size whole house generator do I need,” you are ready for a professional load review, fuel plan, and ATS strategy. With one‑day turnkey installation, remote monitoring, and 24/7 support, Tri‑State makes backup power simple across Western Kentucky and nearby areas.

Ready to Size It Right?

Call Tri-State Water Power and Air at (877) 301-7693 or visit http://www.tristatewhywait.com/ to schedule your free site evaluation or get a free instant online estimate. Mention this page for a Free Site Evaluation on standby generator sizing. Protect your home before the next storm hits.

Tri-State Water Power and Air provides turnkey standby generator installation, maintenance, and 24/7 support across Western Kentucky, Southeast Missouri, Southern Illinois, and Northeast Arkansas. We partner with Generac and KOHLER, deliver one‑day turnkey installs, and back our work with strong warranties. Our factory‑trained technicians and long‑standing A+ BBB rating reflect a track record of safety, compliance, and reliable service.