Generator Performance Depends on Correct Sizing and Proper Installation

An undersized generator cannot carry your home’s essential systems during an outage.

An oversized unit costs more to install and run than your home requires. Getting it right means assessing your actual electrical load before recommending a system. Haller’s licensed electricians serve homeowners across Central and Eastern Pennsylvania. We assess your home’s electrical system, fuel access, and the systems you need to protect before recommending a generator. Every installation is code-compliant and backed by our 100% satisfaction guarantee.

(717) 204-8120

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What to Expect During a Generator Installation

Haller follows a proven installation process to ensure your new generator is sized correctly and performs exactly as it should when the power goes out.

We visit your home to assess your electrical system, power needs, and installation requirements. We evaluate which systems you need to keep running during an outage, your home’s total electrical load, and the best placement for the unit. In older homes throughout Lancaster County, fuel availability, transfer switch requirements, and pad placement vary in ways that affect both the equipment selection and what the installation involves. We size for your actual household needs, not a general estimate.

We walk you through the generator options suited to your home, covering output capacity, fuel type, and automatic transfer switch configuration, and give you clear pricing before any work begins. If your electrical panel or fuel supply requires modification to support the new unit correctly, we explain that as part of the recommendation rather than after the fact.

Our team installs your generator, connects it to your electrical system via a code-compliant transfer switch, and places the unit on a stable, properly prepared pad. We fully test the system through a simulated outage cycle before the job is complete. Before we leave, we walk you through how the system operates and what to expect during an actual outage.

(717) 204-8120


What Our Customers Are Saying

Learn More About Our 100% Satisfaction Guarantee

4.7
Based on 2557 reviews
My AC stopped working on a Saturday evening. The repairman was here in under an hour. The condensate pump had failed. He replaced it and was on his way in under 30 minutes. He asked management if the service call fee could be waived since the annual maintenance had recently been done and that lowered the bill by $200. This is a high character company with customer oriented employees. Five stars.
Nevin is top tier. Comes up with solutions and executes a plan like if it was his own home. Very dedicated for a successful outcome at a fair cost.
Haller diagnosed the issue with my whole-house water filtration system quickly. It was repaired quickly as well. Friendly service person who explained the issues and solution to me. I already had their service plan for one hvac system, so I converted to a whole home plan to cover the water and upstairs hvac as well.
Great service with great advice. I was very happy with my experience and maintenance.
Phil was awesome.
A technician by the name of Hunter came out to fix our air conditioning unit. He was very thorough and informative. He was able to diagnose the issue quickly and efficiently. We were very pleased with his service.
Fixed our heat pump. Nevin was professional and courteous.
They did a great job, were courteous, and explained everything they did and how it works. I recommend them.
Great service!
Iโ€™ve been a long time customer, and they provided me with excellent service, and treated me fairly for a recent job. The tech was great as well, knowledgeable and quick. Very pleased overall
The HVAC technician, Mason , was extremely professional, polite, and knowledgeable. He fully explained each phase of the process for both of my units.
Friendly and quick service. Only dinged them 1 star because they charge a lot for R-410A coolant installed; too expensive.
Tech was super knowledgeable and very prompt . We are glad we got the service contract for our HVAC to cover cost of yearly maintenance and service!
Polite thorough. To date i have been impressed with your service and techs. Keep up the good work.
Called for help with a/c at 9 am and everything was fixed before 11:30. Very pleased with service. Don is awesome.
Nathan from Haller was an exceptional technician. He was thorough with the maintenance and cleaning of our equipment and took the time to explain all of the checkpoints taken. He identified a spores issue in our ventilation system and was able to install a scrubber system to take care of the problem in the same appointment. I appreciated his professionalism and sincerity. Thank you.
Very prompt, polite, and energetic.
Tech was thorough while doing routine winter maintenance on our HVAC system. Would highly recommended Haller. Good service and reasonable prices.
Noah and Bob performed the heat pump inspection and routine maintenance work. They were very polite!
Did a great job on our heater
My experience today was great.my technician was prompt, courteous, thorough and extremely professional. I'd certainly recommend.
1/23/26 visit – tech was incredible. Excellent service, highly qualified tech fabulous service – best in a long time!
Careful worker and very thorough with his wirk
James was very helpful and professional
Nevin was wonderful. I cannot say enough good things.
Mark was very professional, knowledgeable, and honest. The work was completed well and efficiently.
Great company to work with and friendly and knowledgeable techs

(717) 204-8120

Signs Your Generator Needs Replacing

Generators rarely fail without warning. The signs of a declining system appear well before an unexpected failure during an outage.

Most residential standby generators last 10 to 20 years depending on usage and maintenance. In Pennsylvania, where nor’easters and summer storms can knock out power for days at a time, a generator that is aging or unreliable is a liability. If yours is showing any of the following signs, replacing it on your schedule is better than discovering the problem mid-outage.

If your generator has required service calls more than once in recent years, it may be nearing the end of its practical life. Ongoing repairs add up quickly, and each one represents time the system was unavailable. Homeowners in Harrisburg who have dealt with repeated repairs typically find replacement is the more cost-effective answer.

When your generator struggles to carry essential systems or cannot maintain stable output during an outage, it is no longer meeting your home’s needs. That can mean the unit is undersized for how your household has grown, or it can mean internal components are degrading. Either way, a correctly sized replacement solves it.

Generator components wear with age and use. A system that is more than 15 years old may still start, but aging electrical components and degraded fuel systems reduce reliability exactly when reliability matters most. Homeowners in Allentown with older units often find that upgrading to a current model improves both performance and safety.

Hard starts, unusual noises, or unreliable operation under load are signs of internal issues. A generator that hesitates or stalls during testing is a generator that may not perform during an actual outage in Carlisle or anywhere else. Replacing it removes that uncertainty.

Benefits of Installing a New Generator

A correctly sized and properly installed whole-home generator is reliable, automatic, and largely invisible in your daily routine until you need it. That is exactly what it should be.

These are the practical differences a correct installation makes compared to an undersized, aging, or improperly configured unit.

A standby generator starts automatically when power is lost and carries your home’s essential systems without any action required from you. Heating, cooling, refrigeration, lighting, and medical equipment stay running. Your daily routine in Bethlehem continues with minimal disruption regardless of what is happening on the grid.

Backup power prevents the secondary risks that come with extended outages: frozen pipes during a Pennsylvania winter, food spoilage, loss of sump pump operation during a storm, and loss of lighting and security systems. A correctly installed generator protects the home, not just the comfort.

With a properly sized system in place, you do not have to monitor forecasts with anxiety or make emergency arrangements when a storm is coming. Haller installs and configures generators so the transition to backup power is seamless. You may not even notice the moment it switches over.

Why Homeowners Trust Haller for a Generator Installation

Correct generator installation requires electrical expertise, code compliance, and honest sizing recommendations. Homeowners across Central and Eastern Pennsylvania turn to Haller because we deliver all three.

Haller’s licensed electricians have been serving Pennsylvania homes since 1981 and bring that accumulated regional knowledge to every job.

Our electricians are licensed and trained on the full range of standby generator systems installed across the region. They understand how fuel availability, electrical panel configurations, and local code requirements vary, and they configure installations for the specific conditions in your home โ€” whether that is a property in Easton or a newer build in Exton.

Haller’s electricians arrive prepared, work efficiently, and treat your home with care. We handle pad preparation, transfer switch installation, and system wiring, protect the work area throughout, and leave the site clean. You are not managing the process. We are.

We install generators and configure transfer switches to perform correctly every time the power goes out. That means proper load calculations, correct electrical connections, code-compliant placement, and a full test cycle before we leave. Nothing gets skipped.

Haller is available after the installation for questions, maintenance, and service. If you want the system tested or have questions about performance, we are the team to call.

You receive a clear quote before any work begins. The price we quote is the price you pay.

An undersized generator cannot carry your home’s systems during a prolonged outage. An oversized unit wastes money on installation and fuel. Getting the output capacity right requires an honest assessment of your home’s electrical load and which systems you need to protect. That assessment is where every Haller generator installation starts.

(609) 799-3434


Male Haller tech with tool bag entering residential home smiling.

Contact Haller for a Generator Installation

Since 1981, Haller has been helping homeowners across Central and Eastern Pennsylvania protect their homes with reliable backup power. We are ready to help you do the same. Call or book an appointment online today for generator installation service.


Frequently Asked Questions

How do I know what size generator my home needs?

Generator sizing is determined by your home’s total electrical load and which systems you need to keep running during an outage. A home in York that needs to power heating, cooling, refrigeration, and a sump pump has a different requirement than one focused on lighting and essential appliances only. Our electricians assess your specific load rather than applying a standard formula.

How long does generator installation take?

Most standard generator installations are completed in a single day. The timeline may extend if electrical panel work is required, if the fuel supply needs modification, or if site preparation involves additional work. Our technicians assess all of these factors during the in-home evaluation and give you a clear timeline before work begins.

Where will my generator be installed?

Generators are installed outside your home on a stable, code-compliant pad, positioned to meet local setback requirements and allow for safe operation and service access. We assess your property during the evaluation and recommend the best placement for your specific home.

Do generators start automatically during an outage?

Yes. Whole-home standby generators connect to an automatic transfer switch that detects the loss of utility power and starts the generator within seconds. You do not need to be home or take any action. When utility power returns, the system transfers back automatically.

When is the best time to install a generator?

Before you need it. A generator installation during an active storm warning involves longer lead times and higher urgency than a planned installation. In Pennsylvania, where nor’easters and summer storms can knock out power for extended periods, installing before the season is the right call.

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