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Sizing a central AC system here starts with what the compressor is actually asked to carry. Homes in St. Tammany Parish, LA run cooling about six months a year, from May through October. A compressor cycling through that kind of sustained load wears its contactor and capacitor faster than a system that runs a short season, which means a contractor has to treat the load calculation as a hard floor, not a rough guide. Install a unit that is too small, or leave the refrigerant charge off at commissioning, and the damage accumulates before the first warranty conversation is over.
Ductwork laid out for an earlier generation of equipment carries assumptions about airflow that a new central AC system does not share. A contractor pricing an installation here has to assess whether the existing trunk lines and branch runs can move what the new unit needs them to move, and whether the return air paths are in the right places. Half the homes in St. Tammany Parish, Louisiana were built in 1995 or earlier (2020-2024 ACS 5-year). That concentration of older stock means a meaningful share of installs in this parish turn on what is already in the walls and ceiling, not on which unit gets ordered.
What Goes Into a Central AC Installation
The outdoor condenser unit sits on a concrete pad outside the house and holds the compressor and condenser coil, which are the mechanical core of the system. Inside, the air handler or furnace-mounted evaporator coil lives in a utility closet, attic, or basement and is the piece that actually conditions the air moving through the home.
The refrigerant line set runs between those two units, connecting the outdoor and indoor sides through a pair of copper lines routed along the exterior or through the structure. A thermostat on an interior wall ties the whole system together, giving the homeowner control over when and how the equipment runs.
The drawing shows the general layout of a central AC system, and a licensed contractor determines exactly what applies to this house.
Get matched in St. Tammany ParishSt. Tammany Parish by the Numbers
146 severe weather events were recorded in St. Tammany Parish, Louisiana between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in St. Tammany Parish, Louisiana were built in 1995 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSt. Tammany Parish, Louisiana holds 113,911 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.9% of the occupied homes in St. Tammany Parish, Louisiana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Every Central AC Install in St. Tammany Parish, Louisiana9 sourced rules and standards
What the installation actually looks like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Licensing Rules for HVAC Work in St. Tammany Parish, Louisiana
Louisiana requires an active state contractor licence: it is unlawful to engage or continue in the business of contracting, or to act as a contractor, without one.
Severe Weather Events in St. Tammany Parish
St. Tammany Parish weather puts real load on cooling equipment, and that load shapes what a properly sized central AC system needs to handle. What gets installed here has to be matched to local conditions, not a national average.
146 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.