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A heat pump going in here is not entering a mild environment where it can be sized to catalog specs and expected to coast. 246 severe weather events were recorded in Grayson County, Texas between 2015 and 2024. At that rate, severe weather is part of what every system in this county runs against across its working life, and a contractor sizing a heat pump for a Grayson County home has to treat that load as a given, not an edge case. Duct sealing, refrigerant line protection, and equipment placement all get harder calls when the climate is this active. A unit sized only for average conditions will be undersized for the conditions it actually meets.
Ductwork laid into a house decades before heat pumps became a standard residential option was sized and routed for a different system, and what a contractor finds inside those runs decides more about an installation job than the unit being swapped in does. Half the homes in Grayson County, Texas were built in 1985 or earlier (2020-2024 ACS 5-year). That puts the existing duct layout at the center of any quote. A contractor has to open and measure before pricing, because the electrical service and the duct capacity in a house of that vintage were matched to equipment with different demands, and a new heat pump has to work with what is already there.
What Goes Into a Heat Pump Installation
The outdoor unit sits on a pad beside the house and holds the compressor and the coil that exchange heat with the outside air. Inside, the air handler mounts in a utility space, closet, or attic and moves conditioned air through the home. These two units are the core of what a contractor puts in place.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two and carrying the refrigerant that makes the system work. A thermostat goes on an interior wall where it reads the home's temperature and tells the system when to run.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Grayson CountyGrayson County, by the numbers
246 severe weather events were recorded in Grayson 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 Grayson County, Texas were built in 1985 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGrayson County, Texas holds 62,132 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.8% of the occupied homes in Grayson County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Grayson County, Texas1 codes, standards, and laws
Licensing and Legal Requirements in Grayson 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 Grayson County
Grayson County's climate puts real stress on heating and cooling equipment year over year. A heat pump sized and installed for local conditions handles that load better than one spec'd for somewhere else.
246 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.