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A contractor quoting a heat pump installation in Union County has to size the unit against the heating season, not the cooling season, because that is where a heat pump earns or loses its keep. Homes in Union County, MS run heat about seven months a year, from October through April. As outdoor temperatures fall through those months, a heat pump's capacity falls with them, and a unit that is undersized will run continuously without closing the gap. That gap is why a load calculation here has to account for the coldest nights, not just the average winter day, and why back-up heat is a sizing question before it is a cost question.
Existing ductwork is the first thing a contractor opens questions about on a heat pump job in Union County, and in much of this housing stock it was sized and routed for whatever system the house was built around, not what is going in now. Half the homes in Union County, Mississippi were built in 1985 or earlier (2020-2024 ACS 5-year). Equipment designed around current refrigerant cycles moves air differently than what those ducts were laid out for, and a contractor quoting the job has to assess whether the existing runs will carry the new system's airflow before the unit itself gets specified. The electrical service gets the same review, since the draw a heat pump places on a panel can differ from what the original installation required.
What a Heat Pump Installation Covers
The outdoor unit sits on a concrete pad or wall brackets beside the house and holds the compressor and the outdoor coil, which together do the work of moving heat between outside air and your home. The indoor air handler mounts inside, most often in a utility closet, attic, or basement, and it circulates conditioned air through the house.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing that passes through an exterior wall. A condensate drain line runs from the air handler to a nearby drain, and a thermostat or control module on an interior wall ties the whole system together.
The drawing shows the typical layout of these components, and a licensed contractor determines exactly what applies to your house and its configuration.
Find a contractor in Union CountyUnion County, Mississippi, by the numbers
95 severe weather events were recorded in Union County, Mississippi 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 Union County, Mississippi were built in 1985 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Mississippi holds 12,250 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 74.7% of the occupied homes in Union County, Mississippi (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Heat Pump Installation in Union County, Mississippi1 sourced rules and standards
Licensing Rules for Union County, Mississippi
Mississippi licenses residential HVAC work at every tier and at any price: a subcontractor of any tier doing heating, ventilation or air conditioning work on a residential construction or improvement project must be licensed by the State Board of Contractors no matter the dollar amount.
Severe Weather Events in Union County
Weather extremes place real demands on heating and cooling equipment, affecting how hard a system works and how long it holds up. What hits Union County shapes what a heat pump installed here needs to handle.
95 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.