AC Installation
in Mechanicsburg, PA

(717) 525-3643

5.0 on Google · Veteran owned · PA License PA203524

Matt from 717

Usually replies in minutes

Hi! I'm Matt. What's going on at home?

Upfront, honest pricing

1-year service warranty

Same-day availability

Licensed & insured in PA

Licensed HVAC professionals delivering precise AC installations across Central Pennsylvania

A new AC system is only as good as its installation. At 717 Plumbing and Heating, we size every system precisely, install it to code, and verify performance before we leave, so you get reliable, efficient cooling from day one. You’ll get competitive pricing and written quotes upfront, so you know exactly what to expect before any work begins.

Call us or schedule your appointment online to get your home cooling the way it should.

Technician servicing an outdoor air conditioning unit — Outdoor unit service

Technicians checking refrigerant pressure with gauges — Refrigerant and pressure checks

01 / 717 PLUMBING & HEATING

Why Mechanicsburg Homeowners Trust 717 for AC Installation

Mechanicsburg’s housing stock is varied, with century-old homes in Downtown Borough, modern builds in Walden and Arcona, larger colonials in Hampden and Silver Spring, and older agricultural properties in Monroe and Upper Allen Townships. Each home presents different challenges for system selection, sizing, and setup.

We’ve worked across:

Historic Borough homes with tight mechanical spaces, older electrical panels, and plaster construction, all of which impact load calculations and equipment placement.
Newer insulated homes where short-cycling and inadequate dehumidification are issues.
Ductless mini-split installation for homes without ductwork.
Replacing aging home equipment with modern, high-SEER2 units for measurable improvements in comfort and energy costs.
Farmhouses and irregular layouts where standard installation approaches often don’t apply.

We do not provide system quotes over the phone. We conduct an on-site evaluation, perform accurate calculations, and recommend a solution that matches your home’s needs.

02 / 717 PLUMBING & HEATING

Accurate Sizing Is the Foundation of Our Services

The most common AC installation mistake is improper sizing. If too small, the system runs nonstop without meeting demand. If too large, it short-cycles, pulls humidity incompletely, and wears out components prematurely.

Our HVAC system installation process is built on the Manual J load calculation methodology, the industry standard endorsed by the Air Conditioning Contractors of America (ACCA). This accounts for your home’s square footage and ceiling height, window area and orientation, insulation values, local climate design temperatures, and existing duct configuration.

Once we have accurate load data, we select equipment that matches your home’s actual demand at Mechanicsburg’s peak summer conditions. We verify that the equipment meets or exceeds Pennsylvania’s SEER2 efficiency minimums.

Signs It’s Time to Replace Rather Than Repair

Not every cooling issue requires a new system; sometimes, AC repair is smarter. But these signs consistently point to replacement as the better investment:

The system is 15 years old or more, and efficiency has noticeably declined.
You’ve spent $500 or more on repairs in the past two seasons without a lasting fix.
The unit still runs on R-22 refrigerant, which is now phased out under EPA regulations and is expensive to source.
Rooms are cool inconsistently, or the system runs constantly even on mild days.
Energy bills are climbing year over year without explanation.

If two or more apply, call us for a clear answer on whether repair or replacement makes more sense for your situation.

03 / 717 PLUMBING & HEATING

Our AC Installation Process

Load calculation and equipment selection: We start with a Manual J calculation based on your home’s actual construction and layout. We select equipment to match measured demand, not estimated square footage.
Permit application: We apply for the required mechanical permit and manage the entire inspection process. Every installation we complete is documented and code-compliant.
Electrical verification: We confirm your panel can support the new system. Any required new circuits or disconnects are coordinated before installation.
Equipment installation: The outdoor condenser is set on a level pad with proper clearances. The indoor air handler is secured and connected to your duct system. Line sets are connected, insulated, and protected.
Refrigerant charging: All refrigerant work is performed in accordance with EPA Section 608 requirements. Charge is set to the manufacturer’s specification by measurement, not estimation.
Thermostat setup: We install or configure your thermostat and verify correct communication across all system components.

Performance Verification: We Test Before We Leave

After installation, we run a full performance check before the job is closed out.

We measure:

Supply and return air temperatures to confirm a 15°F-20°F differential across the evaporator coil.
Check static pressure with a digital manometer to confirm the duct system isn’t overloading the blower.
Verify airflow in CFM at supply registers to confirm conditioned air is reaching key living spaces.
Confirm refrigerant charge by gauging and weighing.

We document the results, walk you through the findings, and schedule the required mechanical inspection. Your system doesn’t just run; it’s verified.

AC Installation for a 1918 Farmhouse in Cumberland County

Ken Carroll’s home was a genuine challenge, a 1918 farmhouse with thick plaster walls, irregular room proportions, and unconventional mechanical access that put most standard installation approaches out of reach.

Our team properly assessed the home, ran accurate load calculations based on its actual construction, and worked through equipment placement and system configuration that fit the property’s layout rather than ignoring it.

Ken later shared:

“The unique setup of my home was no issue for them… and they were very knowledgeable when I was asking them questions. I would definitely recommend 717 P&H to anyone needing work done.”

Post-installation testing confirmed the correct temperature differential, refrigerant charge within spec, and adequate airflow throughout the home. The result was a system that performed at peak in a home that required real expertise to get there. Read Ken’s full Google review here.

Why Delaying a Failing System Costs More Than You Think

Running an aging or inefficient system isn’t a neutral choice; it’s an ongoing cost. TheU.S. Department of Energy estimates that cooling accounts for roughly half of a home’s energy use. A system running below rated efficiency on that portion of your bill can add up to a significant amount over a full summer season.

More critically, continued operation of a declining system raises the risk of complete compressor failure. A compressor that fails in mid-July leaves your household without cooling when contractors are fully booked, and pricing reflects demand.

A planned replacement, by contrast, happens on your terms, with the right equipment, proper permits, and no emergency timeline.

04 / 717 PLUMBING & HEATING

What You Get With 717 Plumbing and Heating

Licensed, insured, and veteran-owned PA license PA203524.
Permit-managed from start to finish, and hand you a code-compliant installation.
Manual J sizing on every job, not guesswork.
High-efficiency equipment from reputable manufacturers that deliver real long-term energy savings.
Post-installation performance and refrigerant charge are confirmed before we leave.
A one-year labor warranty covers all workmanship on your AC installation.
Transparent pricing, upfront estimates, and financing options available.
Regular AC tune-ups and maintenance with priority service and emergency support.

05 / 717 PLUMBING & HEATING

Schedule Your AC Installation Consultation Today

We serve Mechanicsburg, Camp Hill, Carlisle, Harrisburg, York, New Cumberland, Lemoyne, Middletown, Hershey, Duncannon, Halifax, Dillsburg, and Wormleysburg.

We’ll assess your home, walk you through your options honestly, and make sure your new system is installed right, the first time. Call us today or book an online consultation.

OUR PROMISE

Repair first.
Replace only
when it pays.

WE INSTALL AND SERVICE ALL MAJOR BRANDS

5.0 stars from
real neighbors.

“JT arrived within around 30 minutes of the initial call, and this was 7pm on a Friday… We were back up and running within 90 minutes or less.”

Jon S · Google

“A large HVAC company insisted I needed a whole new system. Matt quickly found the real issue, just a simple fix. No pressure, no gimmicks, just honest work done right.”

Shivani N · Google

“Had a plumbing emergency over the weekend. Justin came out Sunday morning and replaced a valve. No extra charge for Sunday service. Fair pricing.”

Jennifer B · Google

“The service Home Depot uses didn't get in touch until Thursday! Matt and 717 only took 2 hours to save us!”

Jesse F · Google

“He cleaned and unclogged 50 years of build up. Our sink flows like new again. Price was great and service was top notch.”

Matt D · Google

“Other plumbers insisted on charging just to look. 717 gave us an estimate. Responsive, professional, and very fair in pricing.”

Stephen M · Google

“Impeccable customer service. They came out for our emergency quickly and found a long-term fix. Very reasonable prices.”

Linda S · Google

“The epitome of excellence in serving any customer needs. They care about your concerns. You need not look any further.”

Eugenia C · Google

The actual repair

HOW WE PRICE

Your bill,sliced honestly.

Every slice of your invoice is something you can see. You approve the price before we start.

The actual repair
Quality parts
Skilled labor
1-year warranty
Hidden fees$0

717 LOYALTY PROGRAM

Tune-ups twice a year,
priority all year.

Members get seasonal HVAC tune-ups, priority service and up to 10% off repairs. From $20 a month.

See plans

FAQ

Questions, answered.

Still curious? Call (717) 525-3643, a real person answers.

How long does installation take?+

A standard replacement typically takes one full day. More complex situations, like limited equipment access and electrical updates, may add time.

Is a permit required?+

Yes. Mechanical permits are required throughout Cumberland County.

How do you determine the right system size?+

Through a Manual J load calculation that accounts for square footage, insulation, ceiling height, window area, and local climate data, not a rule-of-thumb estimate.

What SEER2 rating should I look for?+

Pennsylvania requires a minimum SEER2 of 13.4 for split systems. Higher ratings (16 to 20+) lower operating costs. We’ll walk you through the payback math for your specific home.

What happens to my old equipment?+

We remove it and recover refrigerant in compliance with EPA regulations before disposal. Nothing is vented to the atmosphere.

Do you install systems in homes without ductwork?+

We replace and upgrade existing central air systems using existing ductwork. We do not install new duct systems. Contact us if your situation is unusual, and we’ll discuss your options honestly.

How much can a new system save on energy bills?+

Replacing a 10 SEER system with a modern 16 SEER2 unit can cut cooling energy consumption by 30% to 40%. We’ll estimate the impact on your home during the consultation.

Do you serve areas outside Mechanicsburg Borough?+

Yes, we also serve Carlisle, Harrisburg, and York.

KEEP EXPLORING

All HVAC services Heating systems Furnace repair 24/7 emergency furnace AC repair AC tune-ups HVAC installation HVAC maintenance

WHERE WE WORK

Your neighbors
in South Central PA.

See all service areas Find us on maps

Cumberland County

Dauphin County

York County

Perry & Adams

Don't see your town? Call and we'll confirm coverage for your address.

Need help today?
We're one call away.

Easy scheduling, written quotes before work begins, and a 1-year warranty on our services.