Furnace Installation in Franklin, TN
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Williamson County will get in touch.
Tell us about the job
It takes about a minute.
Franklin winters keep a furnace working seven months a year
From October through April your furnace is the thing standing between you and a 30°F night. That's seven months of regular use, not just a few cold snaps. A new furnace installed here has to be sized and set up for that stretch of the year.
Most homes in the area heat with gas, and any non-weatherized gas furnace built after November 2015 has to reach at least 80 percent AFUE by federal rule. Power matters too. In Tennessee, 20% of households went at least 24 hours without power in 2024, and Williamson County has seen 10 winter storms and 205 damaging wind events over the past ten years. That's worth talking through with whoever installs your furnace, since it affects what happens on the night the power goes out and the temperature keeps dropping.
- 7 months
- October through April, your furnace is on duty
- 30°F
- the average winter night it heats against
- 53%
- 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 $70 a year to run in Williamson County compared with a gas furnace.
Estimates for a typical Williamson County home, from EIA household energy data, Tennessee fuel prices and NOAA climate normals. Your home will differ.
- What size furnace does my house need?
- The right size comes from a load calculation, not the square footage of your house alone. A contractor measures your windows, insulation, ceiling height, and how much sun each room gets, then figures out how much heat your house loses on a cold night. A furnace that's too big will short cycle, heating in bursts and wearing out faster. One that's too small will run constantly and still leave you cold when it's 30°F outside, which is a normal winter night here. Ask for the load calculation in writing, not a guess based on your old furnace or your neighbor's house.
- How do I know it's time to replace my furnace?
- Age is one sign, but how the furnace is running matters more. Watch for uneven heat between rooms, a furnace that runs longer to reach the same temperature, or a gas bill that climbs without an obvious reason. If a contractor tells you the heat exchanger is cracked, that's not a repair, that's a replacement, since a cracked heat exchanger can let combustion gas into your house. Homes here need heat from October through April, so a furnace that's struggling going into a night near 30°F is worth replacing before it fails, not after.
- 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. Every non-weatherized gas furnace made since November 2015 has to reach at least 80 percent AFUE by law, so that's the baseline, not a special upgrade. High-efficiency models go above that baseline, which means less of the gas you burn escapes out the vent as waste heat. With heat needed here 7 months of the year and most homes running on gas, that difference shows up on the gas bill through the winter. A contractor can walk you through which models fit your house and what installing one actually costs.