AC Performance Starts with Correct Sizing and Configuration

A system that is too small cannot keep up when July temperatures climb into the high 80s and humidity makes every degree feel heavier.

A system that is oversized short-cycles and never removes moisture effectively. Getting it right requires more than matching the tonnage of the old unit.

Haller’s NATE-certified technicians serve homeowners across Central and Eastern Pennsylvania. We assess your home’s square footage, insulation, layout, and the real cooling demands of Pennsylvania summers before recommending a system.

(717) 204-8120

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How Our AC Installation Process Works

Haller follows a proven installation process to ensure your new AC is sized correctly and performs exactly as it should from the first hot day of the season.

We start by evaluating your home’s cooling needs, taking into account square footage, insulation, ceiling height, sun exposure, and current system performance. Pennsylvania summers run hot and humid from late May through mid-September, with July temperatures regularly reaching the mid-to-high 80s and humidity that amplifies the perceived temperature well past the thermometer reading. A system sized for average conditions will struggle on the days that matter most. We size for your home’s actual cooling load and climate, not a general estimate.

Our team explains your options, from energy-efficient models to smart thermostat compatibility, and helps you choose a system that fits your home and budget. We give you clear pricing before any work begins. If your existing ductwork, electrical service, or refrigerant line set requires modification to support the new unit correctly, we explain that as part of the recommendation rather than after the fact.

Our NATE-certified technicians install your new system with precision, ensuring correct duct connections, refrigerant charge, and electrical integration. Every step follows local codes and manufacturer specifications. After installation, we test the system thoroughly, confirm correct cooling output and airflow, and walk you through operation before we leave.

(717) 204-8120


What Our Customers Are Saying

Learn More About Our 100% Satisfaction Guarantee

4.7
Based on 2471 reviews
Shane is amazing. Above and beyond the call of duty
Excellent service- very personable and professional
Quick and courteous.
Andrew and everyone at Haller Enterprises did a great job in getting our furnace fixed. Andrew is also very personable. Thanks for all your help
Excellent service and great professional personality
Great cleanup
Very respectful
Noah was very thorough and thoughtful during visit. He asked many questions so that he could solve the problem.
Needed emergency service and they were there within a few hours. Great service. Friendly and efficient.
Excellent job and appreciated the explanation of what and why happened!!
Quick service and professional handling. Great experience.
They were on time and were through and professional . Was very pleasant.
Daniel S. worked hard to install a new kitchen faucet in my home. He was very helpful and went above and beyond his job duties.
Great service! Friendly, fast, and professional.
A/C fan stopped working Wednesday night just at the end of a heat wave. I called Haller Thursday morning and they scheduled a service call that morning! Their technician Nevin showed up when he said he would and by 1 pm on Thursday, less than 5 hours after my call, had the system examined, diagnosed, and fixed! Had the part needed in his truck. Outstanding service when I needed them most. 5 stars for Nevin.
Three services fulfilled: kitchen sink with complete related plumbing install, toilet install after repositioning rough-in, galvanized pipes replaced with PEX throughout an historic home. All completed timely with quality solutions plus advised me on tub/shower DIY project. I highly recommend.
It was a pleasure having Bradley in our home. He was professional and was determined to address our electrical needs. He communicated, advised and responded. Left home before he was finished. Not one concern for security. If I have future needs I will be requesting by name. Thanks, Haller's
Christian was great! On,time polite, & thorough.
Very professional and his service finding the problem was excellent
Our AC stopped working in the evening and Haller had a technician out to our house by the middle of the next day. Jason diagnosed the problem, quickly fixed it, and gave use fair estimates for future maintenance and upgrades to our system – very happy with the entire process!
Last-minute AC tuneup. Well needed and appreciate all of the input from Christopher as to what may need to be fixed and cleaned. Thanks for being patient and understanding since we had to communicate via the phone. My AC unit looks brand new!! Definitely needed a good cleaning. Now on a maintenance plan.
Very personalable
Nevin was a very polite young man, quietly did his job cleaned up everything and kept us apprised of his findings. Overall a very pleasant visit.
Thorough and helpful.yearly service
Jason did a really good job cleaning my air conditioners. Would highly recommend him..
Great, friendly service.
Shawn checked out my AC system and all was good. Appreciate his honesty and feel I'm finally working with a company with integrity, not sales people…

(717) 204-8120

Signs It’s Time to Install a New AC System

AC systems rarely fail completely without warning. The signs of a declining system usually appear well before the hottest stretch of a Pennsylvania summer.

Central AC systems typically last 10 to 15 years with proper maintenance. In Pennsylvania, where a cooling system runs from late May through mid-September under real humidity and heat, systems accumulate hours faster than in drier or milder climates. If yours is approaching that range and showing any of the following signs, replacing it on your schedule is better than a breakdown on the hottest day of July.

If you are scheduling repairs more than once in a cooling season, the system is spending more of its remaining life in repair cycles than continued investment justifies. In Lancaster, homeowners dealing with repeat AC failures heading into summer typically find that replacement is the better path forward. A new unit reduces the risk of repeated failures and gives you reliable cooling through the seasons when it matters most.

Older air conditioners work harder to reach the same level of comfort, which drives up electricity costs. When July humidity makes every degree feel heavier and an aging system cannot keep up, it runs longer and costs more to deliver less. Upgrading to a modern unit restores efficiency and brings monthly cooling costs back in line.

If some rooms stay warm while others feel comfortable, or the system runs constantly without reaching the set temperature during peak summer heat, the unit is no longer functioning correctly for your home. That can mean incorrect sizing from the original installation or declining output from aging components. Either way, a correctly sized replacement solves it.

The Benefits of Installing a New AC in Pennsylvania

A correctly sized and professionally installed air conditioner keeps every room in your home comfortable through the full stretch of a Pennsylvania summer while running efficiently in the background. That is exactly what it should do.

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

A system sized and installed correctly for your home’s layout and cooling load delivers even temperatures throughout every room. No hot spots near the windows. No rooms that never quite cool down. During the stretch from June through August when heat and humidity push your system hardest, consistent performance is the difference between a comfortable home and one that never fully recovers.

Modern AC systems operate at significantly higher efficiency ratings than units from a decade or more ago. In the Lehigh Valley and across the region, where a cooling system runs hard through a genuinely hot and humid summer, the efficiency difference between a current unit and an aging one shows up on your energy bill every month through the cooling season.

New systems often feature improved filtration and dehumidification, helping to reduce dust, allergens, and excess moisture. In Harrisburg, where summer humidity adds to indoor air quality concerns, a correctly sized system that runs full cycles removes moisture effectively and makes the indoor environment feel genuinely comfortable rather than just cooler.

A brand-new installation means fewer breakdowns and maintenance headaches. You can spend less time troubleshooting issues or calling for emergency service, giving you peace of mind all season long.

Why Homeowners Trust Haller for Their Heating and Cooling Needs

We have been serving families in Pennsylvania for over 40 years, and our focus is always on making the experience as simple and reliable as possible.

Haller’s NATE-certified technicians have been installing and servicing air conditioning systems in Pennsylvania homes since 1981 and bring that accumulated regional knowledge to every job.

We provide clear, upfront quotes before any work begins, so you will never face unexpected fees. Every recommendation is based on what your home actually needs, not sales targets or unnecessary upgrades.

Our technicians hold NATE certifications, giving you confidence in their expert-level knowledge and hands-on skill. You can trust them to handle installations, repairs, and maintenance with precision.

From older properties in Abington to newer construction in Warrington, we know the quirks and needs of local buildings. This experience helps us tailor solutions that fit your home’s structure and your family’s comfort.

Haller technicians focus on what is best for your home, emphasizing comfort, efficiency, and long-term performance. You will not hear pushy sales pitches or unnecessary add-ons, just straightforward guidance.

We install and service leading AC brands, giving you access to reliable systems and the latest technology. Choosing trusted equipment ensures consistent performance and peace of mind for years to come.

Beyond air conditioning, we provide heating, plumbing, electrical, and indoor air quality services. Rely on one trusted team to keep your home running smoothly across multiple systems.

(609) 799-3434



Male Haller tech with tool bag entering residential home smiling.

Ready to Upgrade Your Air Conditioning?

Since 1981, Haller has been helping homeowners across Central and Eastern Pennsylvania get the right system installed correctly. We are ready to help you do the same. Call or book an appointment online today for air conditioning installation service.


FAQs About Air Conditioning Installation

How do I know if I need a new AC?

Frequent repairs, inconsistent cooling, rising energy bills, or a system that is more than 10 to 15 years old are all signs it may be time for a replacement. In Pennsylvania, where a cooling system runs hard from late May through mid-September under real heat and humidity, a system showing those patterns during peak season has likely reached its limit. Our technicians will assess your current system and give you an honest recommendation.

Can you install AC in older Pennsylvania homes?

Yes. Our team has experience working in older homes throughout the region, where duct configurations, electrical service, and structural conditions vary significantly from newer construction. We assess your home’s specific infrastructure during the evaluation and recommend a system that works with what you have.

How long does an AC installation take?

Most installations are completed in a single day, depending on the size of the system and the condition of the existing infrastructure. Our technicians assess the full scope during the evaluation and give you a clear timeline before work begins.

Do you offer financing for AC installation?

Yes. Haller provides flexible financing options to make installing a new system more manageable. Our goal is to give you a comfortable home without requiring you to wait for a system that is already showing signs of failure.

When is the best time to install a new AC?

Before peak season. A system that fails during a Lehigh Valley heat wave is an emergency installation under pressure, with longer lead times and less time to evaluate options. If your system is approaching 10 to 15 years old and showing signs of decline, replacing it before the cooling season starts gives you time to choose the right system without the urgency of a breakdown in July.

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