Furnace Installation in Greenwood, IN
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Johnson County will get in touch.
Tell us about the job
It takes about a minute.
Greenwood asks a furnace to run eight months a year
From October through May, your furnace is what stands between your house and a 23°F night. That is eight months of the year it has to work, not just the coldest stretch of winter.
Most homes here heat with gas, and any furnace built after November 2015 has to meet the federal minimum of 80 percent AFUE. Power is worth planning for too. In 2024, 17% of Indiana households went at least 24 hours without power, and the area has seen 11 winter storms and 39 damaging wind events over the past ten years. A new furnace should be sized and installed to hold up through that kind of winter, not just a mild one.
- 8 months
- October through May, your furnace is on duty
- 23°F
- the average winter night it heats against
- 64%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $90 a year to run in Johnson County compared with a gas furnace.
Estimates for a typical Johnson County home, from EIA household energy data, Indiana fuel prices and NOAA climate normals. Your home will differ.
In Indiana, HVAC licensing for homes is left to the counties and cities.
Indiana does not license HVAC contractors at the state level. Whatever Johnson County requires of a contractor for a furnace installation comes from the county or city itself, not from a state test or a state record.
In most cities and counties, a furnace installation needs a permit from the local building office and an inspection once the work is done. That inspection is what catches a bad gas connection or a venting mistake, and gas is the part of this job where a mistake is dangerous. In Johnson County, 64% of homes heat with gas, so that inspection is doing the work a license would do in a state that has one.
Sources: Indiana Department of Workforce Development · State of Indiana
- What size furnace does my house need?
- A contractor has to size it with a load calculation, not a chart based on square footage. That calculation looks at your insulation, your windows, your ceiling height, and how the house holds heat once it gets down to 23°F on a winter night here. A furnace that's too big will short cycle and wear out faster. One that's too small will run constantly and still leave you cold. Ask whoever quotes the job to walk you through the numbers, not just hand you a model number.
- How do I know it's time to replace my furnace?
- If it's shutting off on its own, struggling to keep up, or needing a repair call more than once a season, it's time to start planning a replacement. Age matters too, especially on a system that gets used 8 months a year here, October through May. A rising gas bill with no other explanation is another sign the heat exchanger or burners aren't working the way they used to. A contractor can tell you whether what you're seeing is a repair or a sign the furnace is done.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're replacing. Furnaces built on or after November 19, 2015 already have to reach 80 percent AFUE, so the real question is whether a higher-efficiency model saves enough gas over a heating season that runs October through May here to be worth the difference. A high-efficiency furnace also vents through PVC pipe instead of a metal flue, so the installation itself can look different depending on your setup. A contractor can tell you what that means for your house once they've seen it.