Heating and air conditioning repair in Louisville

Stainless steel exterior vent louver on a stone wall

Our guide to heating and air conditioning repair covers how the job works. Below: the Louisville numbers a HVAC contractor looks at, with sources.

Louisville housing, by the numbers

1971 is the median construction year for homes in Louisville (Census ACS). By median year built, homes here are older than in 31 of the 56 other cities we cover. A house from that era may have had its system replaced more than once; the ducts usually stay.
Source: Census ACS

Owner households fill about 61% of the occupied homes in Louisville. That is 160,645 of 264,505 households. Of the 56 other cities in this network, 53 have a lower share of owner-occupied homes. Owner-occupied homes carry most of the replacement decisions in the city.
Source: Census ACS

In Louisville, about 59% of occupied homes heat with utility gas, more than any other fuel. Other fuels: electricity 39%, bottled or tank gas 1%, fuel oil or kerosene under 1%. Homes on that fuel need a contractor licensed and equipped for it.
Source: Census ACS

What the weather asks of a system in Louisville

By the NOAA 1991-2020 normals, summers in Louisville add up to about 1,427 cooling degree days. Measured at the Louisville Wfo (KY) station. Of the 56 other cities in this network, 27 have a lower cooling load. That cooling load is what an air conditioner or heat pump has to keep up with on the long summer afternoons.
Source: NOAA normals

By the NOAA 1991-2020 normals, winters in Louisville add up to about 4,279 heating degree days. Measured at the Louisville Wfo (KY) station. The heating load here is higher than in 33 of the 56 other cities we cover. Winters at that level put most of the year's wear on the heating side.
Source: NOAA normals

Louisville logs roughly 85 freezing nights in an average year. Of the 52 other cities in this network, 31 have a lower number of freezing days.
Source: NOAA normals

Highs of 90 F and up come on roughly 30 days a year around Louisville. Of the 54 other cities in this network, 21 have a lower number of 90 F days.
Source: NOAA normals

Seasons and risk in Louisville

FEMA's National Risk Index rates heat wave risk in Jefferson County, KY as relatively high. 30 of the 55 other cities we cover sit in counties with the same heat wave rating. During a heat wave contractors book up; a tune-up in spring avoids the rush.
Source: FEMA risk index

Jefferson County, KY carries a relatively high cold wave risk rating in FEMA's National Risk Index. 19 of the 53 other cities we cover sit in counties with the same cold wave rating. Cold snaps are the hardest test for a heat pump; ask about backup heat.
Source: FEMA risk index

In Kentucky, HVAC contractors are licensed by the Kentucky Department of Housing, Buildings and Construction; status can be checked on the agency's official lookup page.
Source: Kentucky Department of Housing · Kentucky Department of Housing

Sources, checked October 2026

Local offices and rules in Louisville

For HVAC and gas work in Louisville, Kentucky's adopted list includes the 2015 International Mechanical Code and the 2012 NFPA 54 National Fuel Gas Code, while residential energy rules follow the 2009 IECC.
Source: dhbc.ky.gov. Checked October 2026.

LG&E's WeCare program provides energy-efficient home upgrades for income-qualified customers at or below 200% of the federal poverty level; its Demand Conservation program is closed to new enrollments.
Source: lge-ku.com. Checked October 2026.

LG&E and KU residential rebates cover an air source or ductless heat pump, a central air conditioner and a natural gas furnace, for ENERGY STAR equipment on qualifying residential rates.
Source: lge-ku.com. Checked October 2026.

LG&E provides electricity to about 443,000 customers in Louisville and 16 surrounding counties.
Source: lge-ku.com. Checked October 2026.

If you smell gas, leave the house and call your gas utility from outside. Keep a working carbon monoxide alarm near the bedrooms, and do not open a furnace cabinet that is running.

Common jobs