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Sizing a furnace for a New Orleans house starts with what the burner will actually be asked to do each year. Homes in Orleans Parish, LA run heat about five months a year, from November through March. The heat exchanger, the burner assembly, and the ignition components all cycle through that run, and a system that was undersized at installation works harder on every call for heat than one sized correctly from a Manual J load calculation. That added strain shows up in cracked exchangers and worn igniters sooner than it would on equipment with more idle months to recover in. A licensed contractor quotes the load before quoting the box.
Ductwork laid out for a previous generation of equipment shapes every furnace installation in this parish in a way that the unit itself does not. Half the homes in Orleans Parish, Louisiana were built in 1960 or earlier (2020-2024 ACS 5-year). That means a contractor opening up an attic or a crawlspace to trace the existing runs is doing the work that decides the job, not the work that follows it. If the duct sizing and sealing can carry what a new furnace delivers, the install moves forward. If they cannot, the duct system is the project. The electrical service gets the same look, because what the house was wired to handle and what a current unit draws are questions with different answers in stock this age.
What Gets Installed With a New Furnace
The furnace itself sits in a utility space, a basement, a closet, or an attic, depending on the house. It is the unit that produces heat by burning gas or running electric heating elements, then moves that heated air into the distribution system. The burner assembly and heat exchanger live inside the cabinet, along with the blower that drives warm air outward.
The flue pipe runs from the furnace to an exterior vent, carrying combustion gases out of the house. Alongside the furnace, a contractor installs the air handler components that work with it: the blower motor, the filter housing, and the plenum that connects the unit to the supply and return sides of the home's duct system.
The drawing shows the general layout of these components, and a licensed contractor determines exactly what applies to this house.
Get matched in Orleans ParishOrleans Parish, by the numbers
54 severe weather events were recorded in Orleans 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 Orleans Parish, Louisiana were built in 1960 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOrleans Parish, Louisiana holds 195,552 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 51.2% of the occupied homes in Orleans Parish, Louisiana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Orleans Parish, Louisiana5 codes, standards, and licensing rules
What HVAC Installation Looks Like in Orleans Parish
Non-weatherized gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized oil-fired furnaces manufactured on or after November 19, 2015 must reach 83.0 percent AFUE.
Mobile home gas furnaces manufactured on or after November 19, 2015 must reach 80.0 percent AFUE.
Non-weatherized gas furnaces manufactured on or after December 18, 2028 must reach 95.0 percent AFUE, up from the 80.0 percent minimum that applies to units manufactured before that date.
Licensing Rules for Orleans 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 Orleans Parish
Extreme weather puts real hours on heating equipment. A furnace that carries a home through heavy weather cycles wears faster, and sizing and installing it right for Orleans Parish conditions is work a local contractor has to get right from the start.
54 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.