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Sizing a furnace for Gillespie County requires a contractor to account for real, recurring weather load before anything else gets decided. 88 severe weather events were recorded in Gillespie County, Texas between 2015 and 2024. At that rate, severe weather is a routine operating condition here, and a furnace installed without accounting for it will be specced against a version of this climate that does not exist. Duct routing, equipment capacity, and how the system is sealed all depend on what the equipment will actually face once it is running.
Ductwork laid for older equipment does not automatically carry what a new furnace needs. The routing, sizing, and condition of what is already in the walls is what a contractor works out before anything else on a job in this county. Half the homes in Gillespie County, Texas were built in 1991 or earlier (2020-2024 ACS 5-year). That means the house itself sets the terms of the installation, and the ductwork is where a contractor spends the diagnostic time before a unit is ever ordered.
What Gets Installed With a New Furnace
The furnace itself sits inside the home, usually in a utility closet, basement, or attic. It holds the heat exchanger, the burner assembly, and the blower motor in a single cabinet. That cabinet is the heart of what a contractor brings in and sets into place.
The flue pipe runs from the furnace cabinet to an exterior wall or roofline, carrying combustion gases out of the house. The thermostat mounts on an interior wall and gives the homeowner direct control over the system. A new furnace also gets a dedicated gas line connection at the cabinet.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the conditions of your house.
Get matched in Gillespie CountyGillespie County, by the numbers
88 severe weather events were recorded in Gillespie 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 Gillespie County, Texas were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGillespie County, Texas holds 14,373 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.9% of the occupied homes in Gillespie County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFurnace Installation Rules for Gillespie County, Texas5 codes, standards, and 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 Rules for HVAC Work in Gillespie 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 Gillespie County
Extreme weather puts real hours on heating and cooling equipment, and those hours add up differently depending on where a home sits. A furnace sized and installed for local conditions holds up better than one that was not.
88 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.