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Sizing a furnace here is not a guess you can correct later. Homes in Marshall County, MS run heat about seven months a year, from October through April. A burner that cycles through that kind of season accumulates wear on the heat exchanger and ignition system at a pace that a marginal install will not absorb cleanly. Contractors doing this work run a full load calculation before they spec equipment, because an undersized unit runs longer per cycle and the heat exchanger pays for it over time. The install quality sets the floor everything else is measured against.
Ductwork laid down for one generation of furnace seldom moves air the way a new unit needs it to. Half the homes in Marshall County, Mississippi were built in 1992 or earlier (2020-2024 ACS 5-year). That spread across the county's housing means a contractor sizing a new furnace has to read what is already in the walls and floor cavities before the equipment choice means much. Sections may be undersized, improperly joined, or routed around rooms that have since changed. The electrical service gets checked for the same reason. What the house already has is what sets the scope.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet and is the unit a homeowner sees first. It holds the burner, the heat exchanger, and the blower in one cabinet. The burner produces heat, the exchanger transfers it to the air, and the blower pushes that warmed air into the supply ducts.
The flue pipe runs from the furnace cabinet up through the house and exits at the roof or an exterior wall, carrying combustion gases out of the living space. Beside the furnace, the air handler or fan coil may share the same cabinet or sit directly adjacent, and the thermostat mounts on an interior wall where it reads the temperature of the home and tells the furnace when to fire.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Find a contractor in Marshall CountyMarshall County, Mississippi, by the numbers
60 severe weather events were recorded in Marshall County, Mississippi 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 Marshall County, Mississippi were built in 1992 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMarshall County, Mississippi holds 15,519 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.1% of the occupied homes in Marshall County, Mississippi (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Marshall County, Mississippi5 sourced standards and codes
What Happens When the Contractor Shows Up
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 HVAC Work in Marshall County, Mississippi
Mississippi licenses residential HVAC work at every tier and at any price: a subcontractor of any tier doing heating, ventilation or air conditioning work on a residential construction or improvement project must be licensed by the State Board of Contractors no matter the dollar amount.
Severe Weather Events in Marshall County
Weather stress is cumulative, and a furnace working through it degrades faster than one that sits idle. How hard the weather hits Marshall County is a direct factor in how hard the equipment has to work and what contractors find when they come to install or replace a unit.
60 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.