Furnace Installation in Morristown, TN
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Hamblen County will get in touch.
Tell us about the job
It takes about a minute.
A furnace here works seven months of the year
Morristown homes need heat from October through April. Winter nights average 30°F through those months, so a new furnace has to hold up through a long stretch of real cold, not just a few hard freezes.
Most homes here heat with electricity, and storms are part of life in Hamblen County, with 19 winter storms and 59 damaging wind events recorded over the past ten years. In 2024, 20 percent of Tennessee households went at least 24 hours without power. If a gas furnace is being installed, federal rules require it to reach at least 80 percent AFUE.
- 7 months
- October through April, your furnace is on duty
- 30°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, window count, and layout, so there's no single number that fits every house. A contractor will do a load calculation that looks at your walls, ceiling, windows, and ductwork before recommending a size. This matters more than people think. A furnace that's too big will short cycle, turning on and off more than it should, and one that's too small will run constantly and still leave rooms cold on a 30°F night. Don't let anyone size it off square footage alone.
- How do I know it's time to replace my furnace?
- Watch how your furnace behaves, not just how old it is. Uneven heat between rooms, a burner flame that looks yellow instead of blue, or a gas or electric bill that climbs with no other explanation are all signs something is wearing out. If a repair is priced close to what a new furnace would run, replacing it is usually the better move since you avoid paying again for the next failure. Homes here need heat from October through April, so a furnace struggling in the fall is worth dealing with before the cold months set in.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what furnace you have now. Every non-weatherized gas furnace built since November 2015 has to reach at least 80 percent AFUE, so even a standard replacement today is already fairly efficient. High-efficiency models go beyond that minimum, and the extra cost pays back faster the more months you rely on heat, which here is most of the year, October through April. A contractor can walk you through which models fit your house and how the numbers work out for you.