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Sizing a central AC for this house starts with understanding what the system actually gets asked to do. Homes in Fall River County, SD run cooling about two months a year, from July through August. The compressor spends most of the calendar off, which sounds easy on parts, but long idle stretches let refrigerant-side problems and failing contactors go undetected until the heat arrives. When every homeowner in the county calls at once, a system that was undercharged or had leaky ductwork from day one is already behind. A contractor who gets the load calculation and the installation right the first time is building a system that only needs to prove itself on a handful of days each year, so those days have to count.
Ductwork sized and routed for equipment that is no longer made shapes every central AC installation in this county. Half the homes in Fall River County, South Dakota were built in 1972 or earlier (2020-2024 ACS 5-year). A contractor quoting a new system has to get into the existing ducts and measure what they actually carry, because the capacity a modern unit needs and the capacity that ductwork was built to move are often different numbers. The electrical service gets the same check. If either cannot support the new unit, the scope of the job changes before the equipment is even selected.
The Parts of a Central AC System and What Each One Does
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and holds the compressor and the condenser coil. The indoor air handler or furnace, depending on the setup, lives in a utility space, basement, or attic and pulls warm air across the evaporator coil that sits inside or just above it.
The thermostat is the piece the homeowner touches most directly, mounted on an interior wall, sending signals that tell the system when to run. A copper refrigerant line set runs between the outdoor and indoor units, and a condensate drain carries the moisture the indoor coil pulls from the air out of the living space.
The drawing shows the general layout of a central AC system, and a licensed contractor determines which configuration and components apply to this particular house.
Find a contractor in Fall River CountyFall River County, South Dakota, by the numbers
330 severe weather events were recorded in Fall River County, South Dakota 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 Fall River County, South Dakota were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFall River County, South Dakota holds 4,093 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.4% of the occupied homes in Fall River County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Fall River County, South Dakota8 sourced rules and standards
What the installation looks like in Fall River County
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Severe Weather Events in Fall River County
Extreme weather puts real stress on HVAC equipment, and what happens in a given county shapes how hard a system has to work over its lifetime. Sizing and installing central AC correctly for Fall River County means accounting for the local conditions that drive that load.
330 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.