717 Mechanical LLC is a family-owned HVAC company based in Marietta that services homes in Hershey and Derry Township. We are not the biggest name in Dauphin County and we do not try to be. We show up when we say we will, fix what is actually broken, and give you a straight answer on whether a repair or a replacement makes more sense for your house.
Our Hershey work covers furnace repair, air conditioning repair, heat pump installation, boiler repair, and water heater replacement, backed by maintenance plans that keep the equipment out of trouble between visits.
Need a repair or an estimate in Hershey? Call (717) 468-9567 or send the form and we will get you on the schedule.
Family Owned & Operated
LOCALLY-OWNED & COMMUNITY FOCUSED
OVER A DECADE OF EXPERIENCE
Hershey's housing runs from the original company-town homes near Chocolate Avenue to postwar ranches in Derry Township and newer developments out along the Route 322 corridor toward Hummelstown. Each of those eras heats and cools differently. The older homes tend to have boilers, radiators, and tight mechanical rooms; the newer ones usually have ducted heat pumps or a furnace and central AC pair. 717 Mechanical LLC works on all of it, and we size and quote based on the house in front of us, not a spec sheet.
A furnace that is past 15 years, short cycling, or eating repair money every winter is usually ready to retire. We handle furnace installation with American Standard and Armstrong Air equipment, and we run a load calculation on the house first so the new unit is sized for a Hershey winter rather than copied off the old nameplate.
Ignition failures, dirty flame sensors, tripped limit switches, and worn blower motors make up most of the no-heat calls we take in Derry Township. Our furnace repair techs carry the common parts on the truck. A fall furnace tune-up catches most of those failures before the first cold snap.
Many of the homes in the original Hershey neighborhoods still run hot-water heat through radiators or baseboard. We repair boilers of every fuel type and handle boiler replacement with NTI high-efficiency units when the old cast-iron unit is finally done. Radiator systems are worth keeping; they just need someone who works on them regularly.
Heat pumps are the most common system in newer Derry Township construction, and a modern cold-climate unit handles most of a central Pennsylvania winter on its own. We install ducted heat pumps for whole-house replacement and ductless mini-splits for additions, finished basements, and bonus rooms over the garage.
A heat pump that runs constantly, ices over, or is stuck in auxiliary heat is costing you money every hour. Our heat pump repair service covers refrigerant leaks, reversing valves, defrost controls, and failed capacitors and contactors.
Hershey summers are humid, and an undersized or worn-out air conditioner shows it by running all afternoon without pulling the moisture out of the house. We provide AC repair and central air replacement, and we look at the ductwork and returns during the estimate because that is where most comfort complaints start.
A spring AC tune-up and a fall heating check are the cheapest insurance against a mid-season breakdown. Our HVAC maintenance plans bundle both visits and put Hershey customers ahead in line when something does go wrong.
We install Bradford White tank water heaters for straightforward replacements and Navien and NTI tankless units for households that keep running out of hot water or want the floor space back in a small Hershey utility room.
Lukewarm water, a leaking tank, a pilot that will not stay lit, or a rumbling sound from sediment are all things we can diagnose on the first visit. When the tank is leaking from the shell itself, we will tell you plainly that it is time for a replacement rather than sell you a repair that will not hold.
Humid summers and dry, furnace-heated winters push indoor humidity to both extremes in Derry Township. Our indoor air quality services include whole-house filtration, UV lights at the coil, humidifiers for winter, and dehumidification for the summer months, all tied into the existing system.
From Hershey we cover Derry Township, Hummelstown, and the neighboring communities along Route 422 and Route 322, including:
If you need heating, cooling, or water heater service in Hershey or nearby, we are a phone call away.
Call (717) 468-9567 to schedule HVAC service in Hershey, PA.
Get a QuoteBecause so many Hershey homes run on heat pumps, our maintenance visit is built around the parts of that system that fail first. A 717 Mechanical LLC heat pump tune-up includes:
You get the price before the work starts, and on replacements you get more than one option to choose from. Financing is available on new installations through Service Finance and Wells Fargo, including 0% for 60 months on qualifying systems, so a failed furnace in January does not have to become a lump-sum problem.
A real diagnosis: we find the cause, not just the symptom.
No pressure: repair and replace numbers side by side, your call.
Same-day service: whenever the Hershey route allows.
Financing: available on replacements for qualified homeowners.
No heat in January or no cooling in July gets priority scheduling. Call us first, tell us what the system is doing, and we will fit Hershey calls in the same day whenever the route allows. See our emergency HVAC service page for what to check before we arrive.
Call Our Team
Preventative maintenance is one of the best ways to avoid costly repairs and keep your HVAC system running efficiently. Our maintenance plans include:
We believe every homeowner deserves access to reliable heating and cooling solutions, which is why we offer flexible financing options through companies we trust. Whether you need a new installation or a repair, you'll find a plan that fits your needs.
Learn MoreYes. Hershey and Derry Township are a regular part of our route, about 30 minutes up from our Marietta shop. Our maintenance-plan customers include Dauphin County homeowners who wanted a family-owned alternative to the big regional outfits. We schedule Hershey work in windows that respect your day.
For most Hershey homes we recommend a high-efficiency heat pump, which covers humid summers and most of the heating season on one system, paired with furnace or electric backup for the coldest snaps. The right answer depends on your home's size, insulation, and fuel access, so we run the comparison before quoting.
Yes. Older homes around Hershey and Derry Township often have undersized returns or aging flues that a replacement has to account for. We measure the house, correct airflow problems during installation, and install Armstrong Air and American Standard equipment sized to the structure, not just a like-for-like swap.
Yes. Financing through Service Finance and Wells Fargo is available on new installations, including 0% for 60 months on qualifying systems. Hershey homeowners can replace failing equipment on a planned monthly payment rather than an emergency lump sum. Ask us for current terms when you book an estimate.
Call us right away for no heat in freezing weather, no cooling in a heat wave, burning smells, or a suspected gas leak. For gas odors, leave the house and call your utility first. Urgent Hershey calls get priority scheduling, and we aim for same-day restoration whenever the situation allows.
As a family-focused HVAC company, our mission is to provide honest service with a personal touch. We treat every home as if it were our own, ensuring high-quality workmanship and lasting results.
As a family-focused HVAC company, our mission is to provide honest service with a personal touch. We treat every home as if it were our own, ensuring high-quality workmanship and lasting results.
Enjoy 10% off your next repair call with us.
Take $500 off the installation of a new unit.*
Whether it is a furnace that quit overnight, a heat pump that will not keep up in August, or a water heater on its last legs, 717 Mechanical LLC handles heating, cooling, and water heating for Hershey and Derry Township homes from our shop in Marietta.
We install and service American Standard and Armstrong Air heating and cooling equipment, NTI boilers, Bradford White tank water heaters, and Navien tankless units, and we repair the brands already in your house.
Call (717) 468-9567 to book HVAC repair, installation, or maintenance in Hershey, PA.
Contact us online for a free estimate.
Contact UsLooking for reliable HVAC services near Marietta, PA? We proudly serve Marietta and nearby communities, delivering expert heating, cooling, and indoor air quality services. Whether you’re in Columbia, Mount Joy, or Elizabethtown, our team ensures top-quality workmanship and fast, dependable service. Contact us today for all your home comfort needs!
In addition to serving Marietta, PA, we provide HVAC services to the surrounding Lancaster County communities and beyond, including but not limited to:
No matter where you’re located in these areas, you can count on us for prompt, reliable service.
Schedule Service
© Red Barn Media Group 2026
