Furnace Installation in Nashville, TN
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Davidson County will get in touch.
Tell us about the job
It takes about a minute.
Seven months of heat, most of it on electricity
A furnace in Davidson County runs from October through April. Winter nights average 31°F, and most of those homes bring the temperature up on electric heat. When the power grid has a rough night, a furnace that depends on electricity to run stops working right along with everything else. Tennessee saw 20% of households lose power for at least 24 hours in 2024, and Davidson County has logged 10 winter storms and 462 damaging wind events over the past ten years.
Any non-weatherized gas furnace built after November 19, 2015 has to hit 80 percent AFUE, so a new unit installed now starts at that mark or above.
- 7 months
- October through April, your furnace is on duty
- 31°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 comes from a load calculation, not the square footage of your house. A contractor works through your insulation, your windows, your ceiling height, and how the place is laid out to find the number. A furnace that is too big will short cycle and wear out faster. One that is too small will run all through the winter nights and still not keep up. Ask whoever quotes the job to show you the calculation, not just a number they picked.
- How do I know it's time to replace my furnace?
- If it is breaking down most winters, or the repairs are stacking up, replacing it is usually the better move. Watch for uneven heat between rooms, a furnace that runs long stretches without shutting off, or a rise in your gas or electric bill with no other explanation. Age matters too. Furnaces installed new today have to hit 80 percent AFUE at minimum, so if yours is much older it is likely running well below that. Heat matters here from October through April, so a furnace that is struggling early in that stretch is not going to get easier to live with as winter goes on.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and how much you run the furnace each year. Homes here need heat for 7 months of the year, with winter nights averaging 31°F, so a furnace here is doing real work most of the year. A high-efficiency model burns less fuel to produce the same heat, which matters more the longer your heating season runs. A contractor can walk through the actual models and price the difference for your house.