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Sizing a heat pump for St. Tammany Parish starts with what the unit can actually deliver when outdoor temperatures bottom out, not what the spec sheet advertises at mild conditions. Homes in St. Tammany Parish, LA run heat about five months a year, from November through March. A contractor running a load calculation here has to account for the gap between rated capacity and real output on the coldest nights of that run, and back-up heat sizing follows directly from that gap. A unit that passes a mild-night test can still leave the house short on the hardest days of February.
Ductwork built for a different system is what a contractor has to evaluate before anything else on a heat pump installation here. Half the homes in St. Tammany Parish, Louisiana were built in 1995 or earlier (2020-2024 ACS 5-year). That share of the housing stock was ducted for older central equipment, and a heat pump moves air differently enough that existing runs, returns, and register sizing all bear on whether the new unit performs as rated. Electrical service in houses of that vintage is the second question. A heat pump draws a load that older panels were not always wired to handle, and what the panel actually has is something a contractor confirms on site.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner notices first: a metal cabinet that sits on a pad outside the house and holds the compressor and the outdoor coil. Inside, the air handler mounts in a utility space, closet, or attic and moves conditioned air through the home. These two units are what the installation centers on.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two cabinets through the wall or roofline. A thermostat goes on an interior wall where it reads the home's temperature and tells the system when to run.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the conditions of your home.
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 EstimatesHeat Pump Installation Rules for St. Tammany Parish, Louisiana1 sourced standards and codes
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
Heat pump sizing and equipment selection are shaped by local climate load, and that load includes what the weather does to a building over time. Storm activity in St. Tammany Parish is part of what a contractor weighs when specifying equipment that has to hold up here.
146 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.