Furnace Installation in Carlisle, PA
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Cumberland County will get in touch.
Tell us about the job
It takes about a minute.
Eight months of heating in Carlisle
Winter nights here average 24°F from December through February. Homes in Carlisle need heat from October through May, eight months of the year, so a new furnace spends most of its life working rather than sitting idle.
Any gas furnace installed today has to meet a federal minimum of 80 percent AFUE. Cumberland County has also seen 16 winter storms and 89 damaging wind events over the past ten years, and statewide, 15 percent of households lost power for at least 24 hours in 2024. A furnace here should be sized for a long cold season, with a plan for what happens if the power goes out partway through it.
- 8 months
- October through May, your furnace is on duty
- 24°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Pennsylvania requires contractors to register with the state.
That registration puts the business on file with the state, along with whoever owns it, but nobody tested their work to get it. Pennsylvania does not license HVAC contractors, and cities and towns here are not allowed to require their own license either, so the registration is the only state record that exists on a contractor doing this job.
What actually protects you on a furnace install is the permit. In most cities and counties, putting in a new furnace needs a permit from the local building office, and the work gets inspected once it is done. That inspection is what catches a bad gas connection or a vent that was not run right, the kind of mistake that makes this job dangerous. The registration does not touch any of that. The permit and the inspection do.
Source: Pennsylvania General Assembly
- What size furnace does my house need?
- The right size comes from a load calculation, not the square footage alone. A contractor works through your walls, windows, insulation, and layout using a formula called a Manual J to find the number your house actually needs. Going bigger than that isn't a safety margin, it makes the furnace short cycle, heating in bursts that wear it out faster and leave rooms uneven. With winter lows here averaging 24°F, a correctly sized furnace matters more than it would somewhere milder, since it has to hold steady output for months, not just kick on occasionally.
- How do I know it's time to replace my furnace?
- Age is one sign, along with rising repair frequency, uneven heat between rooms, or a furnace that runs longer to reach the same temperature it used to hit quickly. Once you're calling for repairs more winters than not, the cost of keeping it going starts to outweigh replacing it. Homes here need heat from October through May, eight months of the year, so a furnace on its way out has a long season to fail in. If yours is struggling before winter sets in, that's the point to replace it rather than wait for a breakdown at 24°F.
- Is a high-efficiency furnace worth it?
- It depends on how much you heat and how long you plan to stay in the house. Every new non-weatherized gas furnace sold today has to hit at least 80 percent AFUE by federal rule, so even a standard model isn't wasteful anymore. High-efficiency furnaces go further, pulling more heat out of the exhaust before it leaves the house instead of losing it. With eight months of heating season here, that difference in efficiency gets used a lot more than it would in a place with a short winter. A contractor can walk through the actual models and their AFUE ratings for your house and price out what fits.