Pennsylvania Heating
A row of gray and beige wood-sided two-story houses behind a white picket fence, with a grass lawn in the foreground and large leafy trees overhead.

Furnace Installation in Williamsport, PA

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Takes about a minute. No obligation.

Step 1 of 3: Equipment

Half these homes were built in 1963 or earlier

That's how old half the housing stock in Lycoming County is. A furnace going into a house like that is working with whatever ductwork and venting came before it, not a blank slate.

The new furnace has to match the house, not the old unit

A straight swap assumes the last install got sized right for this house. Matching the furnace to the house itself, the ducts it feeds and the venting it needs, is what the job actually calls for.

8 months
October through May, your furnace is on duty
19°F
the average winter night it heats against
80% AFUE
the federal minimum any new unit must meet
Isometric cutaway illustration of a single-story house showing interior rooms with furniture, ceiling ductwork, and a large furnace unit with a tall flue pipe in a corner room.
Your furnace works hardest from November through March.

NOAA nClimDiv, 1991–2020 normals

Furnaces in Lycoming County run eight months of the year, October through May.

A new furnace here puts in more hours than most furnaces ever will, so sizing it right matters more, not less.

Most of this county already picked the fuel that makes sense here

35.1% of homes heat with gas
Heat runs October through May
Winter nights average 19°F

Heat starts in October here. That gives you September to get a new furnace in without racing the first cold night. A failed furnace in January means taking whatever install date and whatever equipment is available that week. Doing it in September means you pick the unit that fits your house and get it put in on a normal schedule. With eight months of runtime ahead of it every year, this isn't a job worth rushing into.

Eight months of runtime a year is why this install is worth getting right

October through May, the new furnace runs. That's eight months of cycling on and off, more than most furnaces anywhere see. Getting the size and the installer right matters more here than in places where the equipment gets an easy season. This is the one to get done properly.

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A man in a cap, gray work shirt and tan pants climbs porch steps toward a blue front door, carrying a canvas tool bag, with a blue ceramic planter of white flowers beside him.
A gray residential gas furnace installed in an unfinished basement, surrounded by ductwork, a metal flue pipe, and a gas supply line.

An older house needs eyes on it, not a part number

A house built in 1963 or earlier has had a furnace in it longer than it's had this one. Ductwork gets patched, rooms get finished, additions go up, and venting gets rerouted around whatever was already there. None of that shows up on a spec sheet for the new unit. The contractor sizing this job needs to see the house as it stands now, not the footprint it started with. That's a visit, not a guess over the phone.

A bigger furnace isn't a safer bet

An oversized furnace heats the house fast, shuts off, then starts again soon after because the air never had time to carry that heat through the rooms. All that starting and stopping wears the igniter and the blower motor harder than steady runtime would. The rooms farthest from the furnace can stay cold even with a bigger unit, because the problem was never the size of the flame.

The size comes from the house, not the old label

A contractor works out the right size by looking at the walls, the windows, the insulation, and how the rooms are laid out, room by room. The number on the furnace being replaced only tells you what someone decided years ago, not what this house actually needs. Two houses the same size can call for different furnaces once the windows and insulation are different.

A gray forced-air furnace with sheet-metal ductwork stands in an unfinished basement with exposed wooden joists, concrete walls, and a hanging incandescent bulb.

A high-efficiency gas furnace would save about $150 a year to run in Lycoming County compared with a gas furnace.

  • A high-efficiency gas furnace$710 a year
  • A gas furnace$860 a year

Estimates for a typical Lycoming County home, from EIA household energy data, Pennsylvania fuel prices and NOAA climate normals. Your home will differ.

Installation day starts before anyone touches the old furnace. The contractor shuts off gas and power, then disconnects the ductwork and venting from the unit being replaced. Pulling the old furnace out usually takes less time than setting the new one, especially if it has to come through a tight basement stairway or a crawlspace opening. Once the new unit is in place, the work is mostly connections: gas line, venting, ductwork, and the electrical that runs the blower and controls. After that comes testing, checking the flame, the airflow at the registers, and the venting to make sure exhaust is actually leaving the house. A furnace isn't left running until all of that checks out.