Heating and air conditioning repair in Jacksonville
Our guide to heating and air conditioning repair covers how the job works. Below: the Jacksonville numbers a HVAC contractor looks at, with sources.
Homes in Jacksonville
Half of the homes in Jacksonville were built in 1987 or earlier (median year built, Census ACS). By median year built, homes here are older than in 6 of the 56 other cities we cover. Older homes here often have ducts and venting that were sized for a different system.
Source: Census ACS
Source: Census ACS
Owner households fill about 58% of the occupied homes in Jacksonville. That is 227,054 of 394,370 households. The share of owner-occupied homes here is higher than in 49 of the 56 other cities we cover. Owner-occupied homes carry most of the replacement decisions in the city.
Source: Census ACS
Source: Census ACS
In Jacksonville, about 94% of occupied homes heat with electricity, more than any other fuel. Other fuels: utility gas 3%, bottled or tank gas under 1%, fuel oil or kerosene under 1%. Switching fuels is possible, but ask what it means for your panel, gas line and ducts.
Source: Census ACS
Source: Census ACS
What the weather asks of a system in Jacksonville
Air conditioners near Jacksonville face about 3,303 cooling degree days in a typical year, per NOAA's 1991-2020 normals. Measured at the Jacksonville Nas (FL) station. Of the 56 other cities in this network, 51 have a lower cooling load. Cooling demand at that level is why the outdoor unit's size and condition matter here.
Source: NOAA normals
Source: NOAA normals
By the NOAA 1991-2020 normals, winters in Jacksonville add up to about 944 heating degree days. Measured at the Jacksonville Nas (FL) station. Of the 56 other cities in this network, 3 have a lower heating load. Winters at that level put most of the year's wear on the heating side.
Source: NOAA normals
Source: NOAA normals
Near Jacksonville the low drops to freezing on about 4 days in a normal year. The number of freezing days here is higher than in 4 of the 52 other cities we cover.
Source: NOAA normals
Source: NOAA normals
Expect around 96 days a year at 90 F or above in Jacksonville, going by NOAA normals. Of the 54 other cities in this network, 43 have a lower number of 90 F days.
Source: NOAA normals
Source: NOAA normals
Jacksonville seasons, by the numbers
Duval County, FL carries a relatively high heat wave risk rating in FEMA's National Risk Index. The same heat wave rating applies in 30 of the 55 other cities in this network. Extended heat is hard on compressors that are already weak.
Source: FEMA risk index
Source: FEMA risk index
Duval County, FL carries a relatively high cold wave risk rating in FEMA's National Risk Index. The same cold wave rating applies in 19 of the 53 other cities in this network. Cold snaps are the hardest test for a heat pump; ask about backup heat.
Source: FEMA risk index
Source: FEMA risk index
In Florida, HVAC contractors are licensed by the Florida DBPR Construction Industry Licensing Board (CILB); status can be checked on the agency's official lookup page.
Source: Florida DBPR Construction Industry Licensing Board (CILB) (Florida) · Florida DBPR Construction Industry Licensing Board (CILB) license information · Authority naming the Florida DBPR Construction Industry Licensing Board (CILB)
Source: Florida DBPR Construction Industry Licensing Board (CILB) (Florida) · Florida DBPR Construction Industry Licensing Board (CILB) license information · Authority naming the Florida DBPR Construction Industry Licensing Board (CILB)
Sources, checked October 2026
- U.S. Census Bureau, ACS 2024 5-year, profile 16000US1235000
- NOAA NCEI U.S. Climate Normals 1991-2020, station USW00093837
- FEMA National Risk Index (December 2025), Duval County, FL
- Florida DBPR Construction Industry Licensing Board (CILB) (Florida)
- Florida DBPR Construction Industry Licensing Board (CILB) license information
- Authority naming the Florida DBPR Construction Industry Licensing Board (CILB)
Local offices and rules in Jacksonville
Jacksonville's Building Inspection Division is in the Ed Ball Building, 214 North Hogan Street, 2nd Floor (Room 280), Jacksonville, FL 32202, open weekdays 7:00 a.m. to 4:00 p.m., and can also be reached by phone.
Source: www.jacksonville.gov. Checked October 2026.
Source: www.jacksonville.gov. Checked October 2026.
Replacing an air conditioning unit in Jacksonville is treated as a repair that needs a permit, though swapping a part inside a single piece of equipment does not.
Source: www.jacksonville.gov. Checked October 2026.
Source: www.jacksonville.gov. Checked October 2026.
The city's JaxReady site lists JEA, Beaches Energy Services and FPL as the electric utilities serving Duval County, so the provider depends on the address.
Source: www.jaxready.com. Checked October 2026.
Source: www.jaxready.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
