Furnace Installation in Ottumwa, IA
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Wapello County will get in touch.
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Eight months of heat a year, and nights that drop to 18°F
Ottumwa homes need heat from October through May. That is eight months of the year the furnace has to be ready to run. On the coldest nights the average low is 18°F, and a furnace has to keep recovering that ground night after night through the whole stretch.
Most homes here heat with gas, and any new non-weatherized gas furnace has to reach at least 80 percent AFUE under federal rules. That is the floor, not a target to aim for. Wapello County has seen 17 winter storms and 69 damaging wind events over the last ten years, and across Iowa 15 percent of households lost power for a full day or more in 2024. A furnace here needs to hold up through a long heating season and the weather that comes with it.
- 8 months
- October through May, your furnace is on duty
- 18°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 $80 a year to run in Wapello County compared with a gas furnace.
Estimates for a typical Wapello 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.
Iowa licenses HVAC contractors through the Iowa Plumbing and Mechanical Systems Board. That license is issued to the contractor, tested and recorded by the state, not to this specific furnace job.
A furnace installation in most cities and counties also needs a permit from the local building office, with an inspection once the work is done. That inspection is what catches a bad gas connection, which is the dangerous part of putting in a new furnace. In Wapello County, 63.5% of homes heat with gas, so that check matters alongside the license.
Sources: Iowa Legislature · Iowa Department of Inspections, Appeals and Licensing
- What size furnace does my house need?
- The right size comes from a load calculation, not a rule of thumb based on square footage. A contractor measures your walls, windows, insulation and layout and runs those numbers to find the actual heat loss of your house. Too big and it short cycles, wearing out parts faster and leaving rooms uneven. Too small and it runs constantly all winter and still can't keep up on the coldest nights, and here that means nights averaging 18°F. Ask whoever quotes the job to show you the calculation, not just a guess.
- How do I know it's time to replace my furnace?
- Age is the first thing to check. Most furnaces last 15 years, and if yours is past that, a repair now is just a delay before the next one. Watch for signs too. Rooms that used to heat evenly now don't. A burner that cycles more than it used to. A repair bill that's climbing toward what a new unit would cost. Homes here need heat from October through May, eight months of the year, so a furnace on its last legs has a lot of chances to fail when you need it most.
- Is a high-efficiency furnace worth it?
- It depends on how many months your furnace runs and what you're replacing. Every non-weatherized gas furnace made since November 2015 has to reach at least 80 percent AFUE, so even a standard model isn't wasteful anymore. A high-efficiency furnace goes above that, sending less heat out the flue and more into the house, and with heat needed here from October through May, those months add up. Whether the higher upfront cost makes sense for your house is something a contractor can walk through with you when they price the job.