AC Installation in Louisville, KY
A new air conditioner in Louisville will run from May through September every year. Tell us about the house, and a licensed contractor who covers Jefferson County will get in touch.
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Five months of Louisville heat, every year
Your air conditioner in Jefferson County runs May through September, five months a year, with summer afternoons averaging 86°F. Jefferson County has also seen 249 damaging wind events and 60 hail events over the past ten years, with hail up to 2 inches. Whatever goes in outside has to hold up through that.
A new system installed here has to meet 14.3 SEER2, the federal efficiency minimum since 2023. That is the floor every new unit has to clear, not a measure of what it will do in your house, but it is worth knowing before you compare options.
- 5 months
- May through September, your air conditioner is on duty
- 86°F
- the average summer afternoon it cools against
- 60 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $20 a year.
Estimates for a typical Jefferson County home, from EIA household energy data, Kentucky fuel prices and NOAA climate normals. Your home will differ.
Kentucky requires HVAC contractors to hold a state license.
The license is held by the contractor, tested and recorded by the Department of Housing, Buildings and Construction, and it covers the business, not the individual job on your property.
For your install, that license is what stands behind the person doing the work, but it is not the only check. In most cities and counties here, putting in a new air conditioner needs a permit from the local building office, and the work gets inspected once it is done.
Sources: Kentucky Legislative Research Commission · Kentucky Department of Housing, Buildings and Construction
- What size air conditioner does my house need?
- The right size comes from a load calculation, not a rule of thumb based on square footage. A contractor looks at your insulation, your windows, your ductwork and how many rooms face the afternoon sun before landing on a number. An oversized unit cools the air fast but shuts off before it pulls the humidity out, so the house feels damp even at the set temperature. An undersized one runs nonstop on the hot afternoons here and still can't keep up. Ask whoever quotes the job to walk you through the load calculation for your house specifically.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and outdoor unit were installed together and are close in age, replace both. Matching a new outdoor unit to an old indoor coil can leave you with a system that runs less efficiently than either piece is rated for, and some manufacturers will not warranty the mismatch at all. If the indoor coil is newer or was already replaced on its own, a contractor can tell you whether it will pair properly with a new outdoor unit. This is worth asking about directly rather than guessing, since it changes both the work and what gets covered under warranty.
- Do HVAC contractors in Louisville need a state license to work on my home?
- Yes. Kentucky requires HVAC contractors to hold a state license, issued through the Department of Housing, Buildings and Construction. That license covers the contractor, not the individual job, so it's worth confirming the company doing the install holds one. Most cities and counties also require a permit for a new air conditioner, with an inspection once the work is finished, so ask whether that permit is included in the quote.