Furnace Repair Services in Ambler, PA

Most of the older homes in Ambler still vent their heating equipment through a masonry chimney, and that chimney was built for a much larger appliance than the furnace connected to it today. It is an easy thing to overlook and one of the more consequential details in a borough full of houses from the early 1900s.

Davis Modern Heating & Cooling repairs furnaces throughout Ambler and the surrounding Upper Dublin and Whitpain areas. We are family owned, we have been at this since 1850, and we service all brands across gas, oil, propane, and electric equipment.

Our Services

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Why Homeowners in Ambler, PA Trust Us

We have had a great experience with them for both AC service and our boiler. The service team is professional, knowledgeable, and kind. They also make a big effort to get your job taken care of as soon as possible.

Tom, Julian, and Collin did a fantastic job replacing my oil furnace with a natural gas one. This was a very involved oil to gas conversion and they did a fantastic job running the gas lines and installing the new water heater. They were very courteous and did a great job explaining everything. Fair pricing, I would highly recommend!

I've had to call Davis on several occasions with furnace issues. Each time it was fast responses pleasant & friendly technicians they were very informative & got my heater up & running fast. 5 stars from me.

Extremely happy with our experience. We scheduled a tune up thereafter and the technician Nick H professionally maintained our systems, gave us valuable recommendations, and personally rerouted some HVAC piping to help provide additional head clearance in our tight mechanical room without asking. Highly recommend all around.

Furnace was clicking but not igniting. Called Davis and they said they were backed up but would try to get to me. Half hour later they called and said a technician was on their way. Nick arrived and quickly diagnosed the problem. Am up and warming up! Great service! Would highly recommend

What a Failing Furnace Does First

These are the symptoms that most often bring us into an Ambler basement.

No heat at all
Furnace cycling too often
Weak heat from vents
Igniter or pilot failing
Staining around the flue
Moisture on basement walls
Rooms heating unevenly
Rattles at startup
Fuel usage climbing
Carbon monoxide alarm sounding

Any staining or moisture near a flue is worth reporting, since it often points to a venting problem.

Chimneys, Liners, and Borough Venting

When a modern furnace replaces an older one, the flue gases it produces are cooler and lower in volume than what the original chimney was designed to carry. Without a properly sized liner those gases cool inside the masonry, condense, and stay there, which deteriorates the chimney from the inside and can eventually interfere with proper draft.

Poor draft is the part that matters for safety. A flue that cannot move exhaust reliably risks spilling combustion byproducts into the basement, and in a tightly packed borough home with limited combustion air that risk is higher than in a house with a larger, leakier basement. This is why we check venting on every heating call rather than only when someone complains about it.

Basement conditions add to the problem. Twins and older singles in the borough often have damp basements, and that moisture combined with condensing flue gases accelerates corrosion on furnace cabinets, flue connectors, and draft hoods. Equipment down there tends to age faster than the same model installed in a dry, conditioned space.

Our Furnace Repair Process

Our repair process begins with the complaint and works outward. We confirm what the thermostat is calling for, verify power and control voltage, test ignition and flame sensing, check fuel pressure, measure temperature rise, and inspect the heat exchanger, then evaluate venting and combustion air before calling the job complete.

We service and install gas furnaces, oil furnaces, propane equipment, electric heat, boilers, and heat pumps on every brand, along with thermostats, ductwork, and ventilation. Whatever is installed in your basement, we work on it.

If a furnace needs replacing, we explain why and lay out options that actually fit the space available, which in a borough home is a real constraint. High efficiency equipment is available across all fuel types, and we have more than thirty five years of experience with geothermal and solar heating.

The Night We Were Called to South Ambler

Gary called from South Ambler on a cold night after his furnace stopped putting out heat, and he mentioned his carbon monoxide alarm had chirped earlier that week. He had reset the furnace twice and it had run briefly each time.

Our technician found a corroded flue connector with a separated joint and evidence of poor draft at the chimney. We shut the system down, replaced the connector, corrected the venting connection, tested draft and combustion, inspected the heat exchanger, and cleaned the burners before returning the furnace to service.

Heat came back that night and the venting was sound afterward. Gary had assumed the alarm and the heating problem were unrelated, and the more important part of that call was the one he had not phoned about.

The Case for Calling Us in Ambler

Here is what you get when our family takes the call.

In business since 1850
Venting and combustion testing
All brands and fuels
Technicians on call 24/7
Fully licensed in Pennsylvania
Comfortable in tight basements
Safety checked every visit
Customers who stay for decades

Because our on-call service runs around the clock, a furnace that quits on a January night gets a technician that night rather than a spot in tomorrow's schedule.

Frequently Asked Questions

Does my chimney need a liner for a newer furnace?

Often yes. Modern furnaces produce cooler exhaust than older equipment, and an unlined or oversized flue can allow condensation and poor draft.

What should I do if my carbon monoxide alarm sounds?

Get everyone outside, then call the fire department or your gas utility from outside the house. The heating system needs inspection before it is used again.

Do you provide emergency furnace repair?

Yes. We have technicians on call 24 hours a day, including weekends and holidays.

Why does my basement furnace rust faster than expected?

Damp basement air combined with condensing flue gases corrodes cabinets and flue connectors. Managing basement moisture extends equipment life noticeably.

Do you service oil furnaces?

Yes. We repair and maintain oil furnaces and boilers along with gas, propane, and electric equipment.