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

4.7
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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 2412 reviews
Bi-Yearly maintenance of HVAC and hot water heater under a maintenance contract.
Brayden Berkheimer provided excellent service. Very knowledgeable, friendly and efficient.
Ac maint. Very thorough and professional technician
Thanks Ken from Haller Enterprises .. thankful you keep my furnace and AC system operating smoothly!
Very reliable and timely to respond to our needs when our furnace had some issues due to a power surge in our area. Their service people were timely and friendly and resolved our problems.
Very professional, knowledgeable, and personable
Excellent Service.
Ron L did a fantastic job servicing my a/c and heating system. He explained exactly what he did and was very professional and knowledgeable.
You guys did a great job and were immaculate! Thank you for that. Unfortunately, we cannot keep the sign in the yard. We are not permitted to do so.
I signed up for annual maintenance service for our HVAC/Water Heater/Water Softener plus Dryer Vent Cleaning. The process was simple and quick. I was contacted soon after to schedule visits and was able to have techs come the same day. Both guys were professional, friendly, explained what they were going to do and any issues/suggestions they had. The work was done well and we are very pleased.
Very professional, detailed, excellent service
Iโ€™ve used Haller Ent. several times over the years, and they continue to exceed my expectations every single time. Most recently, they handled a major repair for a broken sewer pipe in my front yardโ€”no small jobโ€”and the entire experience was outstanding from start to finish.
The technicians Moises, Ben, Mike, and Danโ€”were absolutely exceptional. Not only were they highly skilled and efficient, but they also took the time to explain the process, answer my questions, and make sure I felt confident every step of the way. They went above and beyond to make sure I was satisfied.
I have recommend Haller to several people and each one had positive experiences. I won't hesitate to call them again and will continue to recommend them to anyone in need of reliable, high-quality plumbing services.
We had a plumbing inspection. Michael was seethorough and informative and personable. He and his assistant worked very efficiently. We did have a small valve leak to an outside spigot repaired.
The entire process from the sales to the full implementation in Communications was both rapid and very highly professional. I highly recommend Haller for excellence in what they do. Thank you!
Friendly professional technician
Very thorough, very
Friendly and experienced
Friendly and competent work performed by great technician Chris M.
Ron the A/C technician for Haller is excellent. Prompt, courteous and very knowledgeable. Excellent customer service and care
Excellent serviceโ€”Nick was courteous, knowledgeable and efficient. He went beyond what he was asked to do.
We just had a service check done on our AC unit. Our technician, Jonathan was very courteous and thorough.
Did an excellent job and fixed the problem in a short time frame. I would
definitely call again for yearly maintenance or any other HVAC issues
Triangle installed our small commercial system in 2016 and we've been experiencing failures nearly every year since. We kept trying to get them to send somebody to root cause the system for the failures, but every time they would just come out and replace the same blown fuse or a wire and send us a bill for ~$1000. We tried communicating our need for a real solution with the main office, but it just sent us to a call center in California. Finally gave up on them and had someone from Haller come out to look at the system, and on the first trip they found multiple errors in the system set up, fixed those, and sent us a bill for about 1/3 the cost. At least the positive here is that we found our new, go to HVAC company, with Haller. Thank you, Hunter!
Customer service contact,In a word Wonderful. Angie is the best. Service Tech Chris who did maintenance professional, knowledgeable and friendly. They enhance the the Company. Kudos to them.
As far as Brayden.i give him a 5 star review..
Nevin did an outstanding job diagnosing and solving a problem with thermostats in our HVAC system. He was patient and professional throughout the service visit.

(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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