Central air conditioner replacement cost in Louisville, KY
Installed, 3 ton (outdoor unit + matching coil)
A typical central AC (3 ton (outdoor unit + matching coil)) costs about $4,650 installed in the Louisville area, about the same as the national figure, because HVAC technicians here earn a median $28 an hour against $29 nationally.
Prices by size in Louisville
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| 2 ton (outdoor unit + matching coil) | $3,150 | $3,500 | $4,450 | $3,500 |
| 3 ton (outdoor unit + matching coil) | $4,100 | $4,650 | $5,950 | $4,650 |
| 4 ton (outdoor unit + matching coil) | $5,450 | $5,950 | $7,400 | $6,000 |
| 5 ton (outdoor unit + matching coil) | $6,650 | $7,350 | $8,550 | $7,400 |
Local labor: what HVAC technicians earn here
| Hourly wage | Louisville metro | United States |
|---|---|---|
| 25th percentile | $23 | $23 |
| Median | $28 | $29 |
| 75th percentile | $33 | $37 |
The Louisville market
Louisville Metro's Construction Review office requires a permit to install, repair or replace any mechanical system and issues a "Residential HVAC Replacement" permit. For 1-2 family homes the fee is $105 for the first system and $50 for each additional one, with three inspections included and extra inspections at $50. A Kentucky HVAC Master or Journeyman must be on site for the entire installation or repair. Permits go to licensed HVAC contractors holding a Kentucky HVAC Master license and a Metro HVAC Contractor's License, or to the owner in person with photo ID and recorded property documents. Water heater permit rules were not found, so confirm. DOE puts Jefferson County in mixed-humid zone 4A; EIA's 2020 survey found 49% of Kentucky homes heat with electricity, 43% with gas, and 84% have central air.
Zone 4A summers in Louisville are humid, so AC sizing affects moisture as much as temperature. An oversized unit shuts off before it dries the air. Ask for a load calculation, since the old size may have been a guess, and ask whether the indoor coil is being replaced to match. Look for the inspector's sticker on the condenser when the job is done. A correction sticker means the contractor owes you a fix.
Permits in Louisville
| Permit for this job | Yes (source) |
|---|---|
| Fee | $105 for the first system, $50 for each additional system (1 & 2 family, new or replacement); each HVAC permit includes 3 inspections; additional inspections $50 (since Nov 1, 2022). Water heater fee: none found. |
| Who can pull it | HVAC: licensed HVAC contractor (KY HVAC Master + Metro HVAC Contractor's License) or the property owner in person with ID and recorded property documentation |
| Inspection | Yes |
Rebates in Kentucky
HEAR: announced, not open yet. HOMES: announced, not open yet. Source: Kentucky Office of Energy Policy (Energy and Environment Cabinet), checked October 13, 2026.
What these programs cover, and other states
Other systems in Louisville
- Gas tank water heater
- Gas tankless water heater
- Gas furnace
- Heat pump (ducted, outdoor unit + air handler)
Central air conditioner cost in other metros
Sources
- Louisville, KY permit source (water heater permit)
- Louisville, KY permit source (hvac permit)
- Louisville, KY permit source: 1&2 family HVAC $105 first system, $50 each additional; 3 inspections
- DOE Building America: Guide to Determining Climate Regions by County
- Kentucky Home Energy Rebates
- EIA RECS 2020: Highlights for space heating fuel in U.S. homes by state
- EIA RECS 2020: Highlights for space heating in U.S. homes by state
- EIA RECS 2020: Highlights for air conditioning in U.S. homes by state
- EIA RECS 2020: Highlights for water heating in U.S. homes by state
- BLS OEWS May 2025, Louisville/Jefferson County, KY-IN (49-9021 HVAC mechanics and installers)
- DOE Residential CAC & Heat Pumps Direct Final Rule TSD (Dec 2016), Table 8.2.30, split AC coil-only (2015$; 4-ton interpolated)