Furnace Installation in Arnold, MO
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Jefferson County will get in touch.
Tell us about the job
It takes about a minute.
Arnold asks a furnace to work seven months a year
Winter nights here average 25°F, and homes need heat from October through April. That is seven months of the year your furnace has to work.
A new gas furnace installed today has to meet a federal minimum of 80 percent AFUE if it is a non-weatherized model, so that floor is set no matter who installs it. Power is worth planning around too. In Missouri, 19% of households went at least 24 hours without power in 2024, and the last ten years brought 11 winter storms and 53 damaging wind events to the area. A furnace that starts back up on its own once power returns is worth asking about when you're choosing a new one.
- 7 months
- October through April, your furnace is on duty
- 25°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
- What size furnace does my house need?
- A contractor needs to run a load calculation on your house before anyone can answer that, since square footage alone doesn't tell you enough. Insulation, window count, ceiling height, and how the ductwork is laid out all change the number. A furnace that's too big will short cycle and wear out faster, and one that's too small will run constantly and still leave you cold on the coldest nights here. Don't let anyone size it off a quick guess or what your old unit was rated for, especially if that furnace was original to the house.
- How do I know it's time to replace my furnace?
- The clearest signs are a furnace that needs a repair every winter, rooms that won't heat evenly anymore, and a system that's simply gotten old. Yellow flame instead of blue, soot around the cabinet, or a carbon monoxide detector that's started going off are not things to wait out. With homes here needing heat from October through April and winter nights averaging 25°F, a furnace that's already struggling in fall usually won't make it through a full season. If you're weighing a repair against a replacement, a contractor can tell you which one makes sense for the age and condition of your unit.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what your current furnace is costing you to run. Any non-weatherized gas furnace built since November 2015 already has to hit at least 80 percent AFUE, so even a standard replacement today is more efficient than an older unit. A high-efficiency model burns less gas to make the same heat, which matters most in a place where the furnace runs for 7 months of the year. A contractor can walk you through the actual models and what each one would mean for your house.