Furnace Installation in Le Mars, IA
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Plymouth County will get in touch.
Tell us about the job
It takes about a minute.
Le Mars winters ask a lot of a furnace
Your furnace runs from October through May here, eight months of the year. Winter nights average 13°F, cold enough that it runs long stretches without a break. Almost half the homes in the area heat with gas, and any new furnace installed today has to reach at least 80 percent AFUE by federal rule.
Plymouth County has logged 26 winter storms and 51 damaging wind events over the past ten years, and across Iowa 15 percent of households lost power for at least 24 hours in 2024. A furnace going in now needs to handle the cold nights and hold up through the storms that knock the power out.
- 8 months
- October through May, your furnace is on duty
- 13°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $100 a year to run in Plymouth County compared with a gas furnace.
Estimates for a typical Plymouth County home, from EIA household energy data, Iowa fuel prices and NOAA climate normals. Your home will differ.
Iowa requires HVAC contractors to hold a state license.
The Iowa Plumbing and Mechanical Systems Board issues that license, and it covers the contractor, not the specific job. The board has tested and recorded the person or company taking on your furnace install before they ever show up at your house.
For an installation, that license is what stands behind the work, but it is not the only check. Furnace replacement in most cities and counties also needs a permit from the local building office, along with an inspection once the job is done. That inspection is what confirms the gas connections and venting were done right, separate from whatever the license already says about the contractor. In Plymouth County, close to half of homes heat with gas, so that connection is not a small detail here.
Sources: Iowa Legislature · Iowa Department of Inspections, Appeals and Licensing
- What size furnace does my house need?
- A contractor has to work this out 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 place is laid out, since two houses the same size can need different output. A furnace that is too big will short cycle and wear out faster, and one that is too small will run constantly and still leave you cold on a night at 13 degrees. Ask whoever quotes the job to show you the load calculation, not just a number.
- How do I know it's time to replace my furnace?
- Watch for uneven heat, a furnace that runs longer than it used to, or repairs that keep coming back. Age matters too. Most furnaces last around 15 years, and past that point parts wear out faster than they're worth fixing one at a time. With heat needed here from October through May, a furnace that struggles now is only going to get worse as the nights get colder. If a repair bill is close to what a new furnace would cost, replacing it is usually the better move.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're paying to heat it now. Any furnace made since November 2015 already has to hit at least 80 percent AFUE, so the real question is whether it makes sense to go higher than that minimum. With heat running eight months a year here, a gain in efficiency adds up over a full season more than it would somewhere milder. A contractor can look at your current furnace and your gas bills and tell you what a more efficient model would actually change for your house.