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A furnace contractor diagnosing a repair in Houston County starts by ruling out what the homeowner expects: years of hard use, a filter that went too long, a heat exchanger that was never inspected. 41 severe weather events were recorded in Houston County, Tennessee between 2015 and 2024. At that rate, severe weather is an occasional event in this county, and a system that has quit is far more likely carrying the weight of deferred maintenance or original parts at the end of their service life than any storm-related load. The contractor checks the burner assembly, the igniter, and the blower motor before the weather comes into the conversation at all.
Furnace parts do not age at the same rate as the house they heat, but supply chains do thin out. Half the homes in Houston County, Tennessee were built in 1981 or earlier (2020-2024 ACS 5-year). A system running in stock that old has had years to accumulate repairs, workarounds, and substitutions, and when a contractor opens it up, what they find may be a unit whose manufacturer discontinued that component line before the previous owner moved in. That is the variable that decides whether a repair is a parts order or a longer conversation about what comes next.
The Parts of a Furnace a Contractor Checks First
The furnace itself sits in the basement, utility room, or closet and is the piece a contractor opens first. Inside it, the heat exchanger does the actual work of warming air, and a cracked or corroded exchanger is one of the most serious faults a contractor looks for. The burners, which fire inside that exchanger, are checked for uneven flame, buildup, and ignition problems.
The blower motor and its fan wheel sit at the base of the furnace cabinet and push conditioned air out through the supply side. The flue pipe runs from the top of the furnace to an exterior wall or roof and carries combustion gases out of the house. The control board ties those pieces together, and when behavior is erratic or the system short-cycles, that board is where a contractor looks next.
The drawing shows the general layout of a furnace system, and a licensed contractor determines what applies to the specific equipment and configuration in your house.
Find a contractor in Houston CountyHouston County, Tennessee, by the numbers
41 severe weather events were recorded in Houston County, Tennessee 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 Houston County, Tennessee were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHouston County, Tennessee holds 3,954 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 81.0% of the occupied homes in Houston County, Tennessee (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Furnace Repair in Houston County, Tennessee5 sourced rules & standards
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 Contractors in Houston County, Tennessee
Tennessee licenses contractors by classification, and HVAC, refrigeration and gas piping is one of them — a sub-classification of mechanical contracting on the licence the Board for Licensing Contractors issues.
Severe Weather Events in Houston County
Extreme weather puts real strain on heating equipment, running systems harder and longer than normal conditions require. How much strain depends on what the local weather actually does, and that varies by county.
41 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.