Furnace Installation in Lexington-Fayette urban county, KY
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Fayette County will get in touch.
Tell us about the job
It takes about a minute.
Seven months of heat, and nights near freezing
Furnaces here run October through April, seven months of the year. Winter nights average 27°F through the heart of that stretch, so the furnace going in has real work to do on a good number of those nights, not just short bursts here and there.
A new gas furnace has to meet a federal minimum of 80 percent AFUE. It is also worth asking how the unit comes back on after a power cut. Kentucky saw 24 percent of households lose power for at least 24 hours in 2024, and the last ten years brought 14 winter storms and 108 damaging wind events to the area.
- 7 months
- October through April, your furnace is on duty
- 27°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Kentucky requires HVAC contractors to hold a state license.
The state tests and licenses the contractor, not the job. That license is on file with the Department of Housing, Buildings and Construction, and it stays tied to that contractor across every furnace they install, not just yours.
For a furnace install in Fayette County, that license is what stands behind the person doing the work, but the job itself still goes through the local building office. Most cities and counties require a permit for a furnace replacement and an inspection once it's done, and that inspection is what catches a bad gas connection or a venting mistake before it becomes dangerous.
Sources: Kentucky Legislative Research Commission · Kentucky Department of Housing, Buildings and Construction
- What size furnace does my house need?
- The right size depends on your home's square footage, how well it's insulated, your ceiling height, and how many windows you have facing north. A furnace that's too big cycles on and off too fast and never runs long enough to heat evenly. One that's too small runs constantly and still can't keep up on a 27°F night. A contractor will measure the house and run a load calculation to get the number right, not just go by square footage alone.
- How do I know it's time to replace my furnace?
- If your furnace needs frequent repairs or can't keep the house warm anymore, it's time to start looking at replacement. Watch for uneven heat between rooms, a burner flame that's yellow instead of blue, or a furnace that runs longer and longer to reach the same temperature. Homes here need heat from October through April, so a furnace that struggles early in that stretch is only going to keep struggling. A furnace that short-cycles, meaning it turns on and off in quick bursts, is also telling you something is wrong.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're replacing. Any new non-weatherized gas furnace has to reach at least 80.0 percent AFUE by law, so even a standard model wastes less fuel than an old one might. A high-efficiency furnace goes above that minimum, sending less heat out the flue and more into your house, which matters more here given homes need heat seven months of the year. A contractor can walk you through the actual models and what each one costs installed.