Upper Darby is the most densely populated municipality in Delaware County — and one of the most densely built townships in Pennsylvania outside Philadelphia itself. Pressed against the city’s western edge, it grew in distinct layers: the earliest rowhomes and brick twins east of the 69th Street Transportation Center date to the 1900s and 1910s, built for factory workers and streetcar commuters who needed Center City access without a car. Drexel Hill, which fills the southern half of the township, built out rapidly through the 1920s and 1930s with brick and stucco twins. Cardington, Stonehurst, and Beverly Hills hold the oldest blocks, and Westbrook Park, Garrettford, and Pilgrim Gardens are the postwar layer. Long Lane, Marshall Road, and Lansdowne Avenue each cross two or three building eras in the space of a mile.

That density and age shape HVAC work here. Upper Darby’s housing shares more construction DNA with Philadelphia than with the outer suburbs: shared party walls, stone foundations, basement boiler rooms, and systems converted and patched over a century of use. A technician who treats a 1920s Drexel Hill twin like a 1990s suburban colonial will miss the things that actually fail.

What Upper Darby’s Homes Actually Need

Steam heat in the oldest blocks. The rowhomes east of 69th Street and the early twins of Stonehurst, Bywood, and Cardington were built with steam heat, and many still run it. Steam systems are simple and durable, but they develop a predictable set of problems: radiators that hiss and bang, air vents that fail, water hammer in the pipes, and boilers that lose water or short-cycle. These are fixable — but only by someone who knows steam, because the wrong “fix” (like oversizing a replacement boiler) makes every symptom worse.

Drexel Hill’s bigger twins and colonials. The stone twins and center-hall colonials along Burmont Road and Shadeland Avenue in Drexel Hill are larger homes, often with finished third floors or converted basements. The classic complaint is a top floor that’s 8–10 degrees hotter in summer. The fix is usually duct balancing and sealing, or a ductless mini-split for the stubborn floor — not a bigger air conditioner.

HVAC Services for Upper Darby Homeowners

We also handle furnace repair and replacement, heat pump installation and repair, seasonal maintenance and tune-ups, indoor air quality, duct cleaning and sealing, and thermostats and smart controls across Upper Darby Township — Drexel Hill, Bywood, Highland Park, Stonehurst, Kellyville, Cardington, Westbrook Park, Beverly Hills, Garrettford, Primos, and Secane. If another company told you a costly replacement is your only option, our second-opinion service is built for exactly that moment.

Common HVAC Problems in Upper Darby

• Radiators banging, hissing, or staying cold — the signature of a steam system with failed air vents, improper pitch, or a boiler that’s losing water. In Upper Darby’s oldest rows, this is the number-one winter complaint.
• Top floor 8–10° hotter in summer — Drexel Hill twins and colonials with finished third floors, a single thermostat, and ductwork that was never designed for the extra level.
• AC that runs constantly but never catches up — often a slow refrigerant leak, dirty coils, or duct leakage in an unconditioned attic or basement. In twins with shared walls, leaky ducts also push conditioned air into the wall cavity.
• Furnace or boiler short-cycling — starts, runs a few minutes, shuts off, repeats. A clogged filter is the easy cause; a cracked heat exchanger, bad flame sensor, or oversized replacement boiler is the one that needs a technician.

What Does HVAC Work Cost in Upper Darby?

These are Philadelphia-market ranges, not a quote — your final price depends on an on-site diagnosis, the size and condition of your home, and the equipment you choose:

• Boiler replacement: $7,000–$15,000
• Gas furnace replacement: $4,000–$9,500
• Central AC replacement: $5,500–$12,000
• Ducted heat pump: $7,000–$16,000
• Single-zone ductless mini-split: $3,000–$7,000
• AC or furnace tune-up: $90–$250

The federal 25C tax credit for heat pumps ended December 31, 2025 — if another contractor is still advertising it, that information is out of date. PECO rebates for qualifying heat pumps and central AC may still apply; see our rebates page for current programs.

Frequently Asked Questions — Upper Darby, PA

My radiators bang and hiss every winter. Is my boiler dying?

Not necessarily. Banging and hissing in a steam system usually means failed air vents, radiators that have lost their pitch toward the return pipe, or water level problems — all repairable. What kills steam boilers is neglect: low water, sediment buildup, and a replacement boiler that was oversized. A technician who knows steam will check the vents and the water level before talking replacement.

Can I get air conditioning in a Stonehurst rowhome with no ductwork?

Yes. Ductless mini-splits are the usual answer for Upper Darby’s boiler-heated rowhomes and twins — wall units in the rooms you use most, one outdoor condenser, and no ductwork carved through plaster walls. A high-velocity small-duct system is the other option for whole-house cooling.

Why is my third floor so hot in the summer?

Because the ductwork was designed for two floors and the third was an afterthought — or because there’s no return air up there at all. A bigger AC won’t fix it; it will cool the lower floors faster and shut off sooner, leaving the top floor hot. Duct balancing, duct sealing, or a mini-split for the top floor are the fixes that actually work.

Do you service Drexel Hill and the neighborhoods around 69th Street?

Yes — we serve all of Upper Darby Township, including Drexel Hill, Bywood, Highland Park, Stonehurst, Kellyville, Cardington, Westbrook Park, Beverly Hills, Garrettford, Primos, Secane, and the blocks around the 69th Street Transportation Center.