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The burner in a Union County furnace does not sit idle much. Homes in Union County, MS run heat about seven months a year, from October through April. That much cycling loads the ignition system, the heat exchanger, and the burner assembly in ways that show up before other components do. A contractor diagnosing a repair here checks those parts first, because accumulated thermal stress tends to surface cracks in the heat exchanger and wear the igniter down before anything downstream fails.
Ductwork and heat exchangers in this county's older houses have been running through Mississippi summers and winters for long enough that what a contractor opens is rarely what the age tag on the furnace would suggest. Half the homes in Union County, Mississippi were built in 1985 or earlier (2020-2024 ACS 5-year). That depth of service life shows up inside the cabinet: cracked heat exchangers, worn inducer motors, and secondary components that a parts search has to verify are still in production before the repair can be quoted. The furnace itself may be recent, but the ductwork it runs through is not, and restrictions or leaks in that ductwork change what the repair has to account for.
The Parts of a Furnace a Contractor Checks First
The heat exchanger sits at the core of the furnace cabinet in your utility space, basement, or closet, and it is the piece that actually warms the air moving through the system. Cracks or corrosion here are a serious finding. The burner assembly sits just below it, and a contractor goes to both early when the furnace runs cold or shuts off before the house reaches temperature.
The blower motor and its wheel sit in the lower section of the cabinet and push conditioned air out into the home. The inducer motor pulls combustion gases out through the flue and is often the first piece a contractor pulls when the furnace trips a pressure switch fault. The control board ties every component together and is checked when the fault pattern does not point clearly to a single mechanical part.
The drawing shows a general layout of these components, and a licensed contractor determines which of them apply to your specific equipment and installation.
Find a contractor in Union CountyUnion County, Mississippi, by the numbers
95 severe weather events were recorded in Union 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 Union County, Mississippi were built in 1985 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Mississippi holds 12,250 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.7% of the occupied homes in Union County, Mississippi (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Behind Furnace Repair in Union County, Mississippi5 sourced rules & standards
What Happens When a Contractor Comes Out
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 Repair in Union 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 Union County
Hard weather puts real load on furnace components, and what a system weathers in Union County is different from what a system weathers anywhere else. That local pattern shapes how often repairs come due and what parts take the most strain.
95 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.