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 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 2444 reviews
With a crack in my furnace I opted to replace it and my AC unit. All Haller staff, Wes, Mike, Devonte, and Luke were helpful, experienced, professional, and knowledgeable. Iโ€™m very pleased with the work and grateful for the speed in which the Haller Team assisted in completing this project! I highly recommend Haller!
Carl arrived on time and got to work right away providing maintenance service on our heat pumps
Phillip did an amazing job with my AC service. He cleaned and checked everything thoroughly, making a few suggestions for future maintenance. He was friendly, competent, knowledgeable and efficient. There was no overbearing sales pitch, but he made useful and necessary recommendations. Haller has delivered once again. Highly recommend their services.
Great service! Answered questions I had about certain issues that helped a lot!
Had new furnace installed amazing work
Truly professional
Efficient, courteous technician!
Christopher Meyer performed our yearly maintenance on our air conditioning system and did an excellent job. Very nice, helpful and knowledgeable. Thank you!
Jason was very friendly and explained the maintenance that he did. Tracy was nice to talk to when she called to set up the appointment. Thank you!
This is the second time we had Shawn D. for service. He is very professional, patient and knowledgeable. Thank you!
The service was excellent. Thank you Jared@
Great service today
Hallerโ€™s has excellent employees! Austin was here for our annual spring air conditioning service! He explained to me everything that he did, and the conditions of our system (only required a new filter). Very courteous. I hope he will be our technician next year!!
The technicians are very knowledgeable very professional courteous couldnโ€™t ask for any better
Great service!
Mark did annual maintenance on our tankless water heater. Reset the system and explained things about the system we didnโ€™t know.
The service provider was very pleasant and very efficient he got the job done very quickly
He was very thorough and meticulous
Great timely maintenance service. 14th year keeping our home heated and cooled. Thank you.
Excellent service. I have used Haller for all household needs for over 20 years
Connor was professional, gave options and the price and didnโ€™t pressure. Work was done well, and we appreciated how quickly Haller sent someone out to replace the outside faucet.
Staff is excellent, prompt, friendly, professional
Stephen arrived on time, inspected our thermostat and furnace and explained what our problem was. He explained everything clearly and made suggestions and quoted prices. He was very transparent both on what needed to be done and cost. He then promptly proceeded to complete the needed work. He was very professional. I am very pleased with Stephen and Haller. I highly recommend their services.
Great overall service!
Appt was scheduled quickly, service man was pleasant and explained clearly what repair needed to be done. I have been a customer for years and will continue to call them. To
Repair that was included in our service contract.

(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 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



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Contact Haller for 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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