Furnace Installation in Farmington, MO
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers St. Francois County will get in touch.
Tell us about the job
It takes about a minute.
Farmington asks a furnace to work seven months a year
From October through April, your furnace is what keeps the house warm. That is 7 months of the year, and on winter nights it is working against an average low of 25°F.
Most homes here heat with electricity, and the power does not always stay on. St. Francois County has seen 7 winter storms and 54 damaging wind events over the past ten years, and across Missouri, 19% of households went at least 24 hours without power in 2024. That is worth asking about when you are choosing new equipment. If you are looking at a gas furnace, any non-weatherized model built on or after November 19, 2015 has to reach at least 80 percent AFUE, so that floor is already set for you.
- 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?
- The right size depends on your home's square footage, insulation, ceiling height, window count, and layout, so there's no single number that fits every house. A furnace that's too big cycles on and off too often and never runs long enough to heat evenly. One that's too small runs constantly and still can't keep up on the coldest nights. A contractor will run a load calculation on your specific house to get the size right, not just measure the square footage.
- How do I know it's time to replace my furnace?
- Watch for uneven heat between rooms, a furnace that runs longer than it used to, rising gas bills without a clear reason, or repairs that keep coming back. Age matters too, especially here, where homes need heat from October through April and winter nights average 25°F, so an aging furnace is working hard most of the year. If yours is older and needs a repair, weigh that against how many more winters you expect to get out of it before deciding.
- Is a high-efficiency furnace worth it?
- It depends on how much you heat and how long you plan to stay in the house. Every non-weatherized gas furnace made since November 2015 has to reach at least 80 percent AFUE, so even a standard model today isn't a poor performer. A high-efficiency furnace wastes less gas going out the flue instead of turning into heat, which matters more here, where the furnace runs from October through April and winter nights average 25°F. A contractor can walk through the actual models and what each one would mean for your house.