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Sizing a heat pump for this part of Texas starts with what the house itself demands, not with bracing for weather that rarely arrives. 61 severe weather events were recorded in Marion County, Texas between 2015 and 2024. At that rate, severe weather is an event in Marion County, not a condition, and a contractor quoting an install here is not building around storm frequency. What they are building around is how the unit will perform across long stretches of ordinary heat and humidity, which is where an undersized or poorly commissioned system loses ground. A bad install shows up in the electric bill and the comfort long before any storm does.
Ductwork sized for a different era of equipment is what a contractor opens the walls to find in a significant share of Marion County homes. Half the homes in Marion County, Texas were built in 1981 or earlier (2020-2024 ACS 5-year). That vintage of construction predates the airflow requirements a heat pump places on a duct system, and a contractor quoting an install here has to assess what is already in place before anything else gets priced. Electrical service from the same period carries its own questions about capacity. The duct system, though, is where the job either holds together or expands.
What a Heat Pump Installation Puts in Your Home
The outdoor unit is the piece most homeowners notice first. It sits on a pad beside the house and holds the compressor and the outdoor coil, which do the core work of the system. Inside, the air handler mounts in a utility space, closet, or attic and moves conditioned air through the home.
A refrigerant line set runs between the two units, connecting the outdoor pad to the air handler and carrying the working fluid that makes the exchange possible. A thermostat goes on an interior wall and gives the homeowner control over the whole system.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Marion CountyMarion County by the numbers
61 severe weather events were recorded in Marion 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 Marion County, Texas were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMarion County, Texas holds 5,623 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Marion County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Marion County, Texas1 sourced standards and codes
What Marion County, Texas Requires for HVAC Installation
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 Marion County
Weather swings drive how hard heating and cooling equipment works, and how long it lasts. A heat pump sized and installed for local conditions handles that load better than one spec'd for somewhere else.
61 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.