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A contractor quoting a furnace installation in Houston County is working out what the house actually needs, not what a catalog recommends for a generic Texas address. 77 severe weather events were recorded in Houston County, Texas between 2015 and 2024. At that rate, severe weather touches equipment here from time to time but does not define the operating life of a system the way a relentlessly punishing climate would. What shapes the sizing decision is the building itself: how it was built, how well the previous unit was matched to it, and how long that unit ran before it needed replacing. Those are the variables a contractor establishes before any equipment gets ordered.
Ductwork laid for an older furnace carries assumptions about airflow, trunk sizing, and return placement that a new unit does not share. Half the homes in Houston County, Texas were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor installing a furnace here has to establish whether the existing distribution system will actually move air the way the new equipment expects, and in a significant share of houses in this county, it will not without modification. The electrical service is a separate check. What the house already contains sets the scope before the equipment is even selected.
What Gets Installed With a New Furnace
The furnace itself sits in a utility room, basement, or closet near the center of the house. It is the unit that generates heat, drawing in air, warming it through a heat exchanger, and pushing it back out. The flue pipe runs from the furnace to an exterior wall or roofline, carrying combustion gases out of the house.
The air handler or blower compartment sits inside the furnace cabinet and moves conditioned air into the supply side of the duct system. A new furnace also comes with a gas valve and an ignition assembly, both housed inside the cabinet, and a fresh filter rack where the return air enters the unit before it reaches the heat exchanger.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home and its existing setup.
Get matched in Houston CountyHouston County, Texas, by the numbers
77 severe weather events were recorded in Houston County, Texas 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, Texas were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHouston County, Texas holds 10,837 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.6% of the occupied homes in Houston County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Houston County, Texas5 codes, standards & licensing rules
What HVAC Installation Looks Like in Houston County
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 and Legal Requirements in Houston County, Texas
In Texas a person may not engage in air conditioning and refrigeration contracting unless that person holds a license issued under the state air conditioning and refrigeration contractor law.
Severe Weather History in Houston County
Weather patterns in this part of Texas put real demands on heating equipment over the course of a year. A furnace sized and installed for local conditions handles those demands differently than one spec'd for somewhere else, which is why the record below is relevant to this work.
77 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.