Furnace Installation in Delaware, OH
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Delaware County will get in touch.
Tell us about the job
It takes about a minute.
Delaware County asks a lot of a furnace
Your furnace runs October through May here, eight months a year, with winter nights averaging 23°F. That is most of the year spent cycling on and off to hold the house at temperature, and a new unit needs to be sized and installed to handle that load night after night.
Most homes in the area heat with gas, and any non-weatherized gas furnace built since November 2015 has to reach at least 80 percent AFUE by federal rule. Power is worth planning around too. Ohio saw 18 percent of households go at least 24 hours without power in 2024, and the last ten years brought 5 winter storms and 94 damaging wind events to the state. A furnace install here should account for what happens when the power drops on a night that cold.
- 8 months
- October through May, your furnace is on duty
- 23°F
- the average winter night it heats against
- 68%
- 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 $130 a year to run in Delaware County compared with a gas furnace.
Estimates for a typical Delaware County home, from EIA household energy data, Ohio fuel prices and NOAA climate normals. Your home will differ.
In Ohio, HVAC licensing for homes is left to the counties.
Delaware County sets its own rule for who can do this work, since Ohio leaves HVAC licensing to the counties rather than the state. Ohio does define a home contractor as someone carrying at least $250,000 in liability insurance, but that is a definition written into state law, not a license or a test anyone has to pass.
What actually stands behind a furnace installation here is the permit process. Most cities and counties require a permit from the local building office before the work starts and an inspection once it's done, and that inspection is what catches a bad gas connection or a venting mistake, the parts of this job that can hurt someone. Gas heat is the norm in Delaware County, where 67.6% of homes run on it, so that inspection is doing real work on a job like this one.
Source: Ohio Legislative Service Commission
- What size furnace does my house need?
- It depends on your square footage, your insulation, your ceiling height, and how many windows you have, so there's no single number that fits every house. A contractor works this out with a load calculation, not a chart based on square footage alone. Putting in a furnace that's too big for the house causes it to cycle on and off too fast, which wears out parts sooner and leaves rooms uneven. Too small, and it will run constantly on the 23°F nights here and still struggle to keep up.
- How do I know it's time to replace my furnace?
- Watch for repairs that keep coming back, a furnace that's gotten old, or rooms that won't hold an even temperature anymore. Since homes here need heat from October through May, a furnace that's struggling has eight months to prove it every year. If yours is shutting off on its own, making new noises, or the heat exchanger has cracked, those are reasons to stop repairing and start pricing a replacement. A contractor can tell you whether what you're seeing is normal wear or the beginning of the end.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and how much you run the furnace. Since heat is needed here eight months out of the year, a more efficient furnace has a lot of runtime to make up the difference in fuel use. Every non-weatherized gas furnace made since November 2015 has to hit at least 80 percent AFUE, so even a standard model isn't inefficient anymore. A high-efficiency furnace burns less gas to make the same heat, but a contractor can lay out the actual models and let you weigh the difference for your house.