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Sizing a furnace for Castro County starts with what the climate actually demands of the equipment year after year. 137 severe weather events were recorded in Castro County, Texas between 2015 and 2024. At that rate, severe weather is a standing condition, and a contractor has to account for it before settling on equipment capacity, sealing standards, or how the distribution system is configured. A unit that fits the catalog spec for a house of this square footage can still be wrong for this address if the install does not reflect what the local load asks of it.
Ductwork laid down for an older furnace carries different assumptions about airflow, sizing, and where the runs go. Half the homes in Castro County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year). A new furnace draws on that existing network, and whether the two are compatible is the first question a contractor has to answer on the job, before the unit itself is even priced. If the ducts cannot move what the new system pushes, the installation scope grows. The electrical service gets the same look, since a modern furnace pulls a different load than what the original wiring was planned for.
What Gets Installed With a New Furnace
The furnace itself sits inside the house, most often in a utility closet, basement, or attic. It is the box that generates heat, burning gas through a burner assembly and passing that heat across a heat exchanger before the air moves on. A flue pipe runs from the furnace to the outside, carrying combustion gases out of the house.
The blower fan sits inside the furnace cabinet and pushes conditioned air out through the supply side of the system. Alongside it, the air filter mounts at the return-air opening, and the thermostat goes on an interior wall where it reads the temperature of the living space and signals the furnace to fire.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home.
Get matched in Castro CountyCastro County by the Numbers
137 severe weather events were recorded in Castro 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 Castro County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCastro County, Texas holds 3,024 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.6% of the occupied homes in Castro County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules That Apply in Castro County, Texas5 codes, standards & licensing rules
What the Installation Actually Looks Like
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 for HVAC Installation in Castro 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 Events in Castro County
Weather puts a load on heating equipment that varies by where you live. A furnace sized and installed for the conditions in Castro County will hold up differently than one built for somewhere else.
137 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.